Merge pull request #12780 from opensourcerouting/spdx-license-id

*: convert to SPDX License identifiers

1742 files changed, 1891 insertions, 25227 deletions

diff --git a/COPYING b/COPYING
index d159169d1..84ba352e4 100644
--- a/COPYING
+++ b/COPYING
@@ -1,339 +1,16 @@
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-                            Preamble
-
-  The licenses for most software are designed to take away your
-freedom to share and change it.  By contrast, the GNU General Public
-License is intended to guarantee your freedom to share and change free
-software--to make sure the software is free for all its users.  This
-General Public License applies to most of the Free Software
-Foundation's software and to any other program whose authors commit to
-using it.  (Some other Free Software Foundation software is covered by
-the GNU Lesser General Public License instead.)  You can apply it to
-your programs, too.
-
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-this service if you wish), that you receive source code or can get it
-if you want it, that you can change the software or use pieces of it
-in new free programs; and that you know you can do these things.
-
-  To protect your rights, we need to make restrictions that forbid
-anyone to deny you these rights or to ask you to surrender the rights.
-These restrictions translate to certain responsibilities for you if you
-distribute copies of the software, or if you modify it.
-
-  For example, if you distribute copies of such a program, whether
-gratis or for a fee, you must give the recipients all the rights that
-you have.  You must make sure that they, too, receive or can get the
-source code.  And you must show them these terms so they know their
-rights.
-
-  We protect your rights with two steps: (1) copyright the software, and
-(2) offer you this license which gives you legal permission to copy,
-distribute and/or modify the software.
-
-  Also, for each author's protection and ours, we want to make certain
-that everyone understands that there is no warranty for this free
-software.  If the software is modified by someone else and passed on, we
-want its recipients to know that what they have is not the original, so
-that any problems introduced by others will not reflect on the original
-authors' reputations.
-
-  Finally, any free program is threatened constantly by software
-patents.  We wish to avoid the danger that redistributors of a free
-program will individually obtain patent licenses, in effect making the
-program proprietary.  To prevent this, we have made it clear that any
-patent must be licensed for everyone's free use or not licensed at all.
-
-  The precise terms and conditions for copying, distribution and
-modification follow.
-
-                    GNU GENERAL PUBLIC LICENSE
-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
-
-  0. This License applies to any program or other work which contains
-a notice placed by the copyright holder saying it may be distributed
-under the terms of this General Public License.  The "Program", below,
-refers to any such program or work, and a "work based on the Program"
-means either the Program or any derivative work under copyright law:
-that is to say, a work containing the Program or a portion of it,
-either verbatim or with modifications and/or translated into another
-language.  (Hereinafter, translation is included without limitation in
-the term "modification".)  Each licensee is addressed as "you".
-
-Activities other than copying, distribution and modification are not
-covered by this License; they are outside its scope.  The act of
-running the Program is not restricted, and the output from the Program
-is covered only if its contents constitute a work based on the
-Program (independent of having been made by running the Program).
-Whether that is true depends on what the Program does.
-
-  1. You may copy and distribute verbatim copies of the Program's
-source code as you receive it, in any medium, provided that you
-conspicuously and appropriately publish on each copy an appropriate
-copyright notice and disclaimer of warranty; keep intact all the
-notices that refer to this License and to the absence of any warranty;
-and give any other recipients of the Program a copy of this License
-along with the Program.
-
-You may charge a fee for the physical act of transferring a copy, and
-you may at your option offer warranty protection in exchange for a fee.
-
-  2. You may modify your copy or copies of the Program or any portion
-of it, thus forming a work based on the Program, and copy and
-distribute such modifications or work under the terms of Section 1
-above, provided that you also meet all of these conditions:
-
-    a) You must cause the modified files to carry prominent notices
-    stating that you changed the files and the date of any change.
-
-    b) You must cause any work that you distribute or publish, that in
-    whole or in part contains or is derived from the Program or any
-    part thereof, to be licensed as a whole at no charge to all third
-    parties under the terms of this License.
-
-    c) If the modified program normally reads commands interactively
-    when run, you must cause it, when started running for such
-    interactive use in the most ordinary way, to print or display an
-    announcement including an appropriate copyright notice and a
-    notice that there is no warranty (or else, saying that you provide
-    a warranty) and that users may redistribute the program under
-    these conditions, and telling the user how to view a copy of this
-    License.  (Exception: if the Program itself is interactive but
-    does not normally print such an announcement, your work based on
-    the Program is not required to print an announcement.)
-
-These requirements apply to the modified work as a whole.  If
-identifiable sections of that work are not derived from the Program,
-and can be reasonably considered independent and separate works in
-themselves, then this License, and its terms, do not apply to those
-sections when you distribute them as separate works.  But when you
-distribute the same sections as part of a whole which is a work based
-on the Program, the distribution of the whole must be on the terms of
-this License, whose permissions for other licensees extend to the
-entire whole, and thus to each and every part regardless of who wrote it.
-
-Thus, it is not the intent of this section to claim rights or contest
-your rights to work written entirely by you; rather, the intent is to
-exercise the right to control the distribution of derivative or
-collective works based on the Program.
-
-In addition, mere aggregation of another work not based on the Program
-with the Program (or with a work based on the Program) on a volume of
-a storage or distribution medium does not bring the other work under
-the scope of this License.
-
-  3. You may copy and distribute the Program (or a work based on it,
-under Section 2) in object code or executable form under the terms of
-Sections 1 and 2 above provided that you also do one of the following:
-
-    a) Accompany it with the complete corresponding machine-readable
-    source code, which must be distributed under the terms of Sections
-    1 and 2 above on a medium customarily used for software interchange; or,
-
-    b) Accompany it with a written offer, valid for at least three
-    years, to give any third party, for a charge no more than your
-    cost of physically performing source distribution, a complete
-    machine-readable copy of the corresponding source code, to be
-    distributed under the terms of Sections 1 and 2 above on a medium
-    customarily used for software interchange; or,
-
-    c) Accompany it with the information you received as to the offer
-    to distribute corresponding source code.  (This alternative is
-    allowed only for noncommercial distribution and only if you
-    received the program in object code or executable form with such
-    an offer, in accord with Subsection b above.)
-
-The source code for a work means the preferred form of the work for
-making modifications to it.  For an executable work, complete source
-code means all the source code for all modules it contains, plus any
-associated interface definition files, plus the scripts used to
-control compilation and installation of the executable.  However, as a
-special exception, the source code distributed need not include
-anything that is normally distributed (in either source or binary
-form) with the major components (compiler, kernel, and so on) of the
-operating system on which the executable runs, unless that component
-itself accompanies the executable.
-
-If distribution of executable or object code is made by offering
-access to copy from a designated place, then offering equivalent
-access to copy the source code from the same place counts as
-distribution of the source code, even though third parties are not
-compelled to copy the source along with the object code.
-
-  4. You may not copy, modify, sublicense, or distribute the Program
-except as expressly provided under this License.  Any attempt
-otherwise to copy, modify, sublicense or distribute the Program is
-void, and will automatically terminate your rights under this License.
-However, parties who have received copies, or rights, from you under
-this License will not have their licenses terminated so long as such
-parties remain in full compliance.
-
-  5. You are not required to accept this License, since you have not
-signed it.  However, nothing else grants you permission to modify or
-distribute the Program or its derivative works.  These actions are
-prohibited by law if you do not accept this License.  Therefore, by
-modifying or distributing the Program (or any work based on the
-Program), you indicate your acceptance of this License to do so, and
-all its terms and conditions for copying, distributing or modifying
-the Program or works based on it.
-
-  6. Each time you redistribute the Program (or any work based on the
-Program), the recipient automatically receives a license from the
-original licensor to copy, distribute or modify the Program subject to
-these terms and conditions.  You may not impose any further
-restrictions on the recipients' exercise of the rights granted herein.
-You are not responsible for enforcing compliance by third parties to
-this License.
-
-  7. If, as a consequence of a court judgment or allegation of patent
-infringement or for any other reason (not limited to patent issues),
-conditions are imposed on you (whether by court order, agreement or
-otherwise) that contradict the conditions of this License, they do not
-excuse you from the conditions of this License.  If you cannot
-distribute so as to satisfy simultaneously your obligations under this
-License and any other pertinent obligations, then as a consequence you
-may not distribute the Program at all.  For example, if a patent
-license would not permit royalty-free redistribution of the Program by
-all those who receive copies directly or indirectly through you, then
-the only way you could satisfy both it and this License would be to
-refrain entirely from distribution of the Program.
-
-If any portion of this section is held invalid or unenforceable under
-any particular circumstance, the balance of the section is intended to
-apply and the section as a whole is intended to apply in other
-circumstances.
-
-It is not the purpose of this section to induce you to infringe any
-patents or other property right claims or to contest validity of any
-such claims; this section has the sole purpose of protecting the
-integrity of the free software distribution system, which is
-implemented by public license practices.  Many people have made
-generous contributions to the wide range of software distributed
-through that system in reliance on consistent application of that
-system; it is up to the author/donor to decide if he or she is willing
-to distribute software through any other system and a licensee cannot
-impose that choice.
-
-This section is intended to make thoroughly clear what is believed to
-be a consequence of the rest of this License.
-
-  8. If the distribution and/or use of the Program is restricted in
-certain countries either by patents or by copyrighted interfaces, the
-original copyright holder who places the Program under this License
-may add an explicit geographical distribution limitation excluding
-those countries, so that distribution is permitted only in or among
-countries not thus excluded.  In such case, this License incorporates
-the limitation as if written in the body of this License.
-
-  9. The Free Software Foundation may publish revised and/or new versions
-of the General Public License from time to time.  Such new versions will
-be similar in spirit to the present version, but may differ in detail to
-address new problems or concerns.
-
-Each version is given a distinguishing version number.  If the Program
-specifies a version number of this License which applies to it and "any
-later version", you have the option of following the terms and conditions
-either of that version or of any later version published by the Free
-Software Foundation.  If the Program does not specify a version number of
-this License, you may choose any version ever published by the Free Software
-Foundation.
-
-  10. If you wish to incorporate parts of the Program into other free
-programs whose distribution conditions are different, write to the author
-to ask for permission.  For software which is copyrighted by the Free
-Software Foundation, write to the Free Software Foundation; we sometimes
-make exceptions for this.  Our decision will be guided by the two goals
-of preserving the free status of all derivatives of our free software and
-of promoting the sharing and reuse of software generally.
-
-                            NO WARRANTY
-
-  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
-FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
-OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
-PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
-OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
-TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
-PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
-REPAIR OR CORRECTION.
-
-  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
-REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
-INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
-OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
-TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
-YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
-PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGES.
-
-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-convey the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-
-Also add information on how to contact you by electronic and paper mail.
-
-If the program is interactive, make it output a short notice like this
-when it starts in an interactive mode:
-
-    Gnomovision version 69, Copyright (C) year name of author
-    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, the commands you use may
-be called something other than `show w' and `show c'; they could even be
-mouse-clicks or menu items--whatever suits your program.
-
-You should also get your employer (if you work as a programmer) or your
-school, if any, to sign a "copyright disclaimer" for the program, if
-necessary.  Here is a sample; alter the names:
-
-  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
-  `Gnomovision' (which makes passes at compilers) written by James Hacker.
-
-  <signature of Ty Coon>, 1 April 1989
-  Ty Coon, President of Vice
-
-This General Public License does not permit incorporating your program into
-proprietary programs.  If your program is a subroutine library, you may
-consider it more useful to permit linking proprietary applications with the
-library.  If this is what you want to do, use the GNU Lesser General
-Public License instead of this License.
+The FRRouting project consists of parts with various licenses.  Any particular
+file's license should be indicated at the top of the file with an SPDX License
+identifier.
+
+The full text of all licenses used can be found in doc/licenses.
+
+The composite work (binary) resulting from compiling FRR is thought to always
+be distributable under GPLv2 or later.  However, please note that this is
+simply an expression of the community's best-effort understanding, it is not a
+legal statement, guarantee, or advice of any kind.  If necessary, please
+familiarize yourself with the specifics and/or consult a lawyer.
+
+Also please be advised that FRR's documentation is, for historical reasons,
+licensed under a custom (but relatively permissive) license.  This license
+dates back to the GNU Zebra project and cannot easily be changed into something
+more common, short of rewriting the entire documentation.
diff --git a/babeld/babel_errors.c b/babeld/babel_errors.c
index b22b1d5cb..b093bdbc6 100644
--- a/babeld/babel_errors.c
+++ b/babeld/babel_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Babel-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/babeld/babel_errors.h b/babeld/babel_errors.h
index 629b6604b..47539c704 100644
--- a/babeld/babel_errors.h
+++ b/babeld/babel_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Babel-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __BABEL_ERRORS_H__
diff --git a/babeld/babel_filter.c b/babeld/babel_filter.c
index f49fee8da..053493274 100644
--- a/babeld/babel_filter.c
+++ b/babeld/babel_filter.c
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifdef HAVE_CONFIG_H
diff --git a/babeld/babel_filter.h b/babeld/babel_filter.h
index b88b18d8a..d2535432b 100644
--- a/babeld/babel_filter.h
+++ b/babeld/babel_filter.h
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABELD_BABEL_FILTER_H
diff --git a/babeld/babel_interface.c b/babeld/babel_interface.c
index e8be854f8..ceff472c2 100644
--- a/babeld/babel_interface.c
+++ b/babeld/babel_interface.c
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #include <zebra.h>
diff --git a/babeld/babel_interface.h b/babeld/babel_interface.h
index cf85310be..12fa6e2ba 100644
--- a/babeld/babel_interface.h
+++ b/babeld/babel_interface.h
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_INTERFACE_H
diff --git a/babeld/babel_main.c b/babeld/babel_main.c
index 9aa5ce3a0..0869c120a 100644
--- a/babeld/babel_main.c
+++ b/babeld/babel_main.c
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 /* include zebra library */
diff --git a/babeld/babel_main.h b/babeld/babel_main.h
index 6fd27bf4c..659ddc70c 100644
--- a/babeld/babel_main.h
+++ b/babeld/babel_main.h
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_MAIN_H
diff --git a/babeld/babel_zebra.c b/babeld/babel_zebra.c
index bc8274d21..bead9f27e 100644
--- a/babeld/babel_zebra.c
+++ b/babeld/babel_zebra.c
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 /* FRR's includes */
diff --git a/babeld/babel_zebra.h b/babeld/babel_zebra.h
index c064146bd..7f960d396 100644
--- a/babeld/babel_zebra.h
+++ b/babeld/babel_zebra.h
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_ZEBRA_H
diff --git a/babeld/babeld.c b/babeld/babeld.c
index 81a1eb0e4..510415593 100644
--- a/babeld/babeld.c
+++ b/babeld/babeld.c
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #include <zebra.h>
diff --git a/babeld/babeld.h b/babeld/babeld.h
index 38859f54d..a9ffb7ee4 100644
--- a/babeld/babeld.h
+++ b/babeld/babeld.h
@@ -1,24 +1,7 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_BABELD_H
diff --git a/babeld/kernel.c b/babeld/kernel.c
index 5aa01ceb4..f89fe268d 100644
--- a/babeld/kernel.c
+++ b/babeld/kernel.c
@@ -1,24 +1,7 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright 2007, 2008 by Grégoire Henry, Julien Cristau and Juliusz Chroboczek
 Copyright 2011, 2012 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifdef HAVE_CONFIG_H
diff --git a/babeld/kernel.h b/babeld/kernel.h
index f39bc35bd..414584329 100644
--- a/babeld/kernel.h
+++ b/babeld/kernel.h
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_KERNEL_H
diff --git a/babeld/message.c b/babeld/message.c
index 7d45d91bf..687f76844 100644
--- a/babeld/message.c
+++ b/babeld/message.c
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #include <zebra.h>
diff --git a/babeld/message.h b/babeld/message.h
index 22db35e2a..0797a5a77 100644
--- a/babeld/message.h
+++ b/babeld/message.h
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_MESSAGE_H
diff --git a/babeld/neighbour.c b/babeld/neighbour.c
index d962a0961..51e595a84 100644
--- a/babeld/neighbour.c
+++ b/babeld/neighbour.c
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifdef HAVE_CONFIG_H
diff --git a/babeld/neighbour.h b/babeld/neighbour.h
index 39ee7e483..211166359 100644
--- a/babeld/neighbour.h
+++ b/babeld/neighbour.h
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_NEIGHBOUR_H
diff --git a/babeld/net.c b/babeld/net.c
index 40716a701..15ea2de0f 100644
--- a/babeld/net.c
+++ b/babeld/net.c
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifdef HAVE_CONFIG_H
diff --git a/babeld/net.h b/babeld/net.h
index b3ca3767b..255960206 100644
--- a/babeld/net.h
+++ b/babeld/net.h
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_NET_H
diff --git a/babeld/resend.c b/babeld/resend.c
index f08897fbd..254faac95 100644
--- a/babeld/resend.c
+++ b/babeld/resend.c
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifdef HAVE_CONFIG_H
diff --git a/babeld/resend.h b/babeld/resend.h
index 72b6986eb..d0ec04647 100644
--- a/babeld/resend.h
+++ b/babeld/resend.h
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 #ifndef BABEL_RESEND_H
 #define BABEL_RESEND_H
diff --git a/babeld/route.c b/babeld/route.c
index 8dd1e4043..2c7e92374 100644
--- a/babeld/route.c
+++ b/babeld/route.c
@@ -1,24 +1,7 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #include <zebra.h>
diff --git a/babeld/route.h b/babeld/route.h
index c994d22a9..89427b841 100644
--- a/babeld/route.h
+++ b/babeld/route.h
@@ -1,24 +1,7 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_ROUTE_H
diff --git a/babeld/source.c b/babeld/source.c
index 2c303b624..049fa3272 100644
--- a/babeld/source.c
+++ b/babeld/source.c
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifdef HAVE_CONFIG_H
diff --git a/babeld/source.h b/babeld/source.h
index 5b0ba44aa..5b37ca93b 100644
--- a/babeld/source.h
+++ b/babeld/source.h
@@ -1,23 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_SOURCE_H
diff --git a/babeld/util.c b/babeld/util.c
index e2db75996..4facdabbc 100644
--- a/babeld/util.c
+++ b/babeld/util.c
@@ -1,24 +1,7 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifdef HAVE_CONFIG_H
diff --git a/babeld/util.h b/babeld/util.h
index ef1387364..5e5843543 100644
--- a/babeld/util.h
+++ b/babeld/util.h
@@ -1,24 +1,7 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_UTIL_H
diff --git a/babeld/xroute.c b/babeld/xroute.c
index 61ea5a1ac..30204cd6f 100644
--- a/babeld/xroute.c
+++ b/babeld/xroute.c
@@ -1,24 +1,7 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #include <zebra.h>
diff --git a/babeld/xroute.h b/babeld/xroute.h
index 59afccb59..d2d191ce4 100644
--- a/babeld/xroute.h
+++ b/babeld/xroute.h
@@ -1,24 +1,7 @@
+// SPDX-License-Identifier: MIT
 /*
 Copyright (c) 2007, 2008 by Juliusz Chroboczek
 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
 */
 
 #ifndef BABEL_XROUTE_H
diff --git a/bfdd/bfd.c b/bfdd/bfd.c
index 4367f253e..2586c0b99 100644
--- a/bfdd/bfd.c
+++ b/bfdd/bfd.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*********************************************************************
  * Copyright 2013 Cumulus Networks, LLC.  All rights reserved.
  * Copyright 2014,2015,2016,2017 Cumulus Networks, Inc.  All rights reserved.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
  * bfd.c: implements the BFD protocol.
  *
  * Authors
diff --git a/bfdd/bfd.h b/bfdd/bfd.h
index a5881cddb..97e45bb2c 100644
--- a/bfdd/bfd.h
+++ b/bfdd/bfd.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*********************************************************************
  * Copyright 2014,2015,2016,2017 Cumulus Networks, Inc.  All rights reserved.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
  * bfd.h: implements the BFD protocol.
  */
 
diff --git a/bfdd/bfd_packet.c b/bfdd/bfd_packet.c
index 30f54f130..7be235326 100644
--- a/bfdd/bfd_packet.c
+++ b/bfdd/bfd_packet.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*********************************************************************
  * Copyright 2017 Cumulus Networks, Inc.  All rights reserved.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
  * bfd_packet.c: implements the BFD protocol packet handling.
  *
  * Authors
diff --git a/bfdd/bfdctl.h b/bfdd/bfdctl.h
index c4b2e8030..f1f8185c3 100644
--- a/bfdd/bfdctl.h
+++ b/bfdd/bfdctl.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*********************************************************************
  * Copyright 2017-2018 Network Device Education Foundation, Inc. ("NetDEF")
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
  * bfdctl.h: all BFDd control socket protocol definitions.
  *
  * Authors
diff --git a/bfdd/bfdd.c b/bfdd/bfdd.c
index 7ef229da1..a3751e4d3 100644
--- a/bfdd/bfdd.c
+++ b/bfdd/bfdd.c
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BFD daemon code
  * Copyright (C) 2018 Network Device Education Foundation, Inc. ("NetDEF")
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/bfdd/bfdd_cli.c b/bfdd/bfdd_cli.c
index 52f2dd8fd..44439c675 100644
--- a/bfdd/bfdd_cli.c
+++ b/bfdd/bfdd_cli.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BFD daemon CLI implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include <zebra.h>
diff --git a/bfdd/bfdd_nb.c b/bfdd/bfdd_nb.c
index 29a9b5f2d..7135c5076 100644
--- a/bfdd/bfdd_nb.c
+++ b/bfdd/bfdd_nb.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BFD daemon northbound implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include <zebra.h>
diff --git a/bfdd/bfdd_nb.h b/bfdd/bfdd_nb.h
index d7ac32063..7a0e724d2 100644
--- a/bfdd/bfdd_nb.h
+++ b/bfdd/bfdd_nb.h
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BFD daemon northbound implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #ifndef _FRR_BFDD_NB_H_
diff --git a/bfdd/bfdd_nb_config.c b/bfdd/bfdd_nb_config.c
index c1a2ad7bb..e4e97404d 100644
--- a/bfdd/bfdd_nb_config.c
+++ b/bfdd/bfdd_nb_config.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BFD daemon northbound implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include <zebra.h>
diff --git a/bfdd/bfdd_nb_state.c b/bfdd/bfdd_nb_state.c
index de0dcebfe..12acda8fd 100644
--- a/bfdd/bfdd_nb_state.c
+++ b/bfdd/bfdd_nb_state.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BFD daemon northbound implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include <zebra.h>
diff --git a/bfdd/bfdd_vty.c b/bfdd/bfdd_vty.c
index 7b7a001e2..15444e4e9 100644
--- a/bfdd/bfdd_vty.c
+++ b/bfdd/bfdd_vty.c
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BFD daemon code
  * Copyright (C) 2018 Network Device Education Foundation, Inc. ("NetDEF")
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/bfdd/bfddp_packet.h b/bfdd/bfddp_packet.h
index 4ece94f57..afcbdd758 100644
--- a/bfdd/bfddp_packet.h
+++ b/bfdd/bfddp_packet.h
@@ -1,26 +1,9 @@
+// SPDX-License-Identifier: MIT
 /*
  * BFD Data Plane protocol messages header.
  *
  * Copyright (C) 2020 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael F. Zalamena
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the “Software”), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
  */
 
 /**
diff --git a/bfdd/config.c b/bfdd/config.c
index 22ec91235..22d7d7dee 100644
--- a/bfdd/config.c
+++ b/bfdd/config.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*********************************************************************
  * Copyright 2017-2018 Network Device Education Foundation, Inc. ("NetDEF")
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
  * config.c: implements the BFD daemon configuration handling.
  *
  * Authors
diff --git a/bfdd/control.c b/bfdd/control.c
index 01cfed8f9..a11ed3d89 100644
--- a/bfdd/control.c
+++ b/bfdd/control.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*********************************************************************
  * Copyright 2017-2018 Network Device Education Foundation, Inc. ("NetDEF")
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
  * control.c: implements the BFD daemon control socket. It will be used
  * to talk with clients daemon/scripts/consumers.
  *
diff --git a/bfdd/dplane.c b/bfdd/dplane.c
index c1081643e..99bd1886f 100644
--- a/bfdd/dplane.c
+++ b/bfdd/dplane.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BFD data plane implementation (distributed BFD).
  *
  * Copyright (C) 2020 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bfdd/event.c b/bfdd/event.c
index 654928b9b..5a9ae39c3 100644
--- a/bfdd/event.c
+++ b/bfdd/event.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*********************************************************************
  * Copyright 2017-2018 Network Device Education Foundation, Inc. ("NetDEF")
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
  * event.c: implements the BFD loop event handlers.
  *
  * Authors
diff --git a/bfdd/ptm_adapter.c b/bfdd/ptm_adapter.c
index 8a27fced5..490bc30d7 100644
--- a/bfdd/ptm_adapter.c
+++ b/bfdd/ptm_adapter.c
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BFD PTM adapter code
  * Copyright (C) 2018 Network Device Education Foundation, Inc. ("NetDEF")
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_addpath.c b/bgpd/bgp_addpath.c
index 748fcc92b..7f746541f 100644
--- a/bgpd/bgp_addpath.c
+++ b/bgpd/bgp_addpath.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Addpath TX ID selection, and related utilities
  * Copyright (C) 2018  Amazon.com, Inc. or its affiliates
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/bgpd/bgp_addpath.h b/bgpd/bgp_addpath.h
index 0350ee8a7..909a9710c 100644
--- a/bgpd/bgp_addpath.h
+++ b/bgpd/bgp_addpath.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Addpath TX ID selection, and related utilities
  * Copyright (C) 2018  Amazon.com, Inc. or its affiliates
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGPD_TX_ADDPATH_H
diff --git a/bgpd/bgp_addpath_types.h b/bgpd/bgp_addpath_types.h
index b0b330297..3de9546a6 100644
--- a/bgpd/bgp_addpath_types.h
+++ b/bgpd/bgp_addpath_types.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Addpath TX ID selection, and related utilities
  * Copyright (C) 2018  Amazon.com, Inc. or its affiliates
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGPD_TX_ADDPATH_DATA_H
diff --git a/bgpd/bgp_advertise.c b/bgpd/bgp_advertise.c
index f62a54b03..3469d129e 100644
--- a/bgpd/bgp_advertise.c
+++ b/bgpd/bgp_advertise.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP advertisement and adjacency
  * Copyright (C) 1996, 97, 98, 99, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_advertise.h b/bgpd/bgp_advertise.h
index 70294c2d8..c5e2a5f21 100644
--- a/bgpd/bgp_advertise.h
+++ b/bgpd/bgp_advertise.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP advertisement and adjacency
  * Copyright (C) 1996, 97, 98, 99, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_ADVERTISE_H
diff --git a/bgpd/bgp_aspath.c b/bgpd/bgp_aspath.c
index 2ae693cd3..584f524f0 100644
--- a/bgpd/bgp_aspath.c
+++ b/bgpd/bgp_aspath.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* AS path management routines.
  * Copyright (C) 1996, 97, 98, 99 Kunihiro Ishiguro
  * Copyright (C) 2005 Sun Microsystems, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_aspath.h b/bgpd/bgp_aspath.h
index a814d73dd..dd65b423a 100644
--- a/bgpd/bgp_aspath.h
+++ b/bgpd/bgp_aspath.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* AS path related definitions.
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_ASPATH_H
diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index 572475f06..fe918a3e0 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP attributes management routines.
  * Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_attr.h b/bgpd/bgp_attr.h
index e3499079d..1c7e88a4f 100644
--- a/bgpd/bgp_attr.h
+++ b/bgpd/bgp_attr.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP attributes.
  * Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_ATTR_H
diff --git a/bgpd/bgp_attr_evpn.c b/bgpd/bgp_attr_evpn.c
index d379f40a8..bbc4ba952 100644
--- a/bgpd/bgp_attr_evpn.c
+++ b/bgpd/bgp_attr_evpn.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Ethernet-VPN Attribute handling file
  * Copyright (C) 2016 6WIND
- *
- * This file is part of FRRouting.
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_attr_evpn.h b/bgpd/bgp_attr_evpn.h
index bb4a81693..f8d3978b9 100644
--- a/bgpd/bgp_attr_evpn.h
+++ b/bgpd/bgp_attr_evpn.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* E-VPN attribute handling structure file
  * Copyright (C) 2016 6WIND
- *
- * This file is part of FRRouting.
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_ATTR_EVPN_H
diff --git a/bgpd/bgp_bfd.c b/bgpd/bgp_bfd.c
index 11b074af2..4a81b69ce 100644
--- a/bgpd/bgp_bfd.c
+++ b/bgpd/bgp_bfd.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * bgp_bfd.c: BGP BFD handling routines
  *
  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_bfd.h b/bgpd/bgp_bfd.h
index 9dca48a43..c4045d474 100644
--- a/bgpd/bgp_bfd.h
+++ b/bgpd/bgp_bfd.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * bgp_bfd.h: BGP BFD definitions and structures
  *
  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_BFD_H
diff --git a/bgpd/bgp_bmp.c b/bgpd/bgp_bmp.c
index 2a65dbac8..d89f6de64 100644
--- a/bgpd/bgp_bmp.c
+++ b/bgpd/bgp_bmp.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BMP support.
  * Copyright (C) 2018 Yasuhiro Ohara
  * Copyright (C) 2019 David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_bmp.h b/bgpd/bgp_bmp.h
index 1693b443e..0c909e139 100644
--- a/bgpd/bgp_bmp.h
+++ b/bgpd/bgp_bmp.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BMP support.
  * Copyright (C) 2018 Yasuhiro Ohara
  * Copyright (C) 2019 David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _BGP_BMP_H_
diff --git a/bgpd/bgp_btoa.c b/bgpd/bgp_btoa.c
index aa14d99f1..b410a4b89 100644
--- a/bgpd/bgp_btoa.c
+++ b/bgpd/bgp_btoa.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP dump to ascii converter
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_clist.c b/bgpd/bgp_clist.c
index 34d4be8c9..2cbbe0a5a 100644
--- a/bgpd/bgp_clist.c
+++ b/bgpd/bgp_clist.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP community-list and extcommunity-list.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_clist.h b/bgpd/bgp_clist.h
index fb8078761..7a9b28038 100644
--- a/bgpd/bgp_clist.h
+++ b/bgpd/bgp_clist.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Community list.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_CLIST_H
diff --git a/bgpd/bgp_community.c b/bgpd/bgp_community.c
index 9f6f337c8..e2bce9cbc 100644
--- a/bgpd/bgp_community.c
+++ b/bgpd/bgp_community.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Community attribute related functions.
  * Copyright (C) 1998, 2001 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_community.h b/bgpd/bgp_community.h
index 05a5d4486..35909a638 100644
--- a/bgpd/bgp_community.h
+++ b/bgpd/bgp_community.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Community attribute related functions.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_COMMUNITY_H
diff --git a/bgpd/bgp_community_alias.c b/bgpd/bgp_community_alias.c
index 3750a2468..1ebe7c4c8 100644
--- a/bgpd/bgp_community_alias.c
+++ b/bgpd/bgp_community_alias.c
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP community, large-community aliasing.
  *
  * Copyright (C) 2021 Donatas Abraitis <donatas.abraitis@gmail.com>
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/bgpd/bgp_community_alias.h b/bgpd/bgp_community_alias.h
index 57cde0ad4..cb7983e1a 100644
--- a/bgpd/bgp_community_alias.h
+++ b/bgpd/bgp_community_alias.h
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP community, large-community aliasing.
  *
  * Copyright (C) 2021 Donatas Abraitis <donatas.abraitis@gmail.com>
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "bgpd/bgp_lcommunity.h"
diff --git a/bgpd/bgp_conditional_adv.c b/bgpd/bgp_conditional_adv.c
index 4ad00ed12..051e336e5 100644
--- a/bgpd/bgp_conditional_adv.c
+++ b/bgpd/bgp_conditional_adv.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP Conditional advertisement
  * Copyright (C) 2020  Samsung R&D Institute India - Bangalore.
  *			Madhurilatha Kuruganti
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_conditional_adv.h b/bgpd/bgp_conditional_adv.h
index a4f1403a4..b1be59366 100644
--- a/bgpd/bgp_conditional_adv.h
+++ b/bgpd/bgp_conditional_adv.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP Conditional advertisement
  * Copyright (C) 2020  Samsung R&D Institute India - Bangalore.
  *			Madhurilatha Kuruganti
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_CONDITION_ADV_H
diff --git a/bgpd/bgp_damp.c b/bgpd/bgp_damp.c
index 56bbaf419..54bbf9b9c 100644
--- a/bgpd/bgp_damp.c
+++ b/bgpd/bgp_damp.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP flap dampening
  * Copyright (C) 2001 IP Infusion Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_damp.h b/bgpd/bgp_damp.h
index f7deea538..129e44416 100644
--- a/bgpd/bgp_damp.h
+++ b/bgpd/bgp_damp.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP flap dampening
  * Copyright (C) 2001 IP Infusion Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_DAMP_H
diff --git a/bgpd/bgp_debug.c b/bgpd/bgp_debug.c
index 8e199820b..2dec1ca46 100644
--- a/bgpd/bgp_debug.c
+++ b/bgpd/bgp_debug.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP-4, BGP-4+ packet debug routine
  * Copyright (C) 1996, 97, 99 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_debug.h b/bgpd/bgp_debug.h
index be5ed0afd..118325e0a 100644
--- a/bgpd/bgp_debug.h
+++ b/bgpd/bgp_debug.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP message debug header.
  * Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_DEBUG_H
diff --git a/bgpd/bgp_dump.c b/bgpd/bgp_dump.c
index 98a2f95ea..794dd7b8b 100644
--- a/bgpd/bgp_dump.c
+++ b/bgpd/bgp_dump.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP-4 dump routine
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_dump.h b/bgpd/bgp_dump.h
index 70e430a9b..2235bbc52 100644
--- a/bgpd/bgp_dump.h
+++ b/bgpd/bgp_dump.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP dump routine.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_DUMP_H
diff --git a/bgpd/bgp_ecommunity.c b/bgpd/bgp_ecommunity.c
index 04005884a..0a4ebc513 100644
--- a/bgpd/bgp_ecommunity.c
+++ b/bgpd/bgp_ecommunity.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Extended Communities Attribute
  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_ecommunity.h b/bgpd/bgp_ecommunity.h
index 4d7d4234a..83a158448 100644
--- a/bgpd/bgp_ecommunity.h
+++ b/bgpd/bgp_ecommunity.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Extended Communities Attribute.
  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_ECOMMUNITY_H
diff --git a/bgpd/bgp_encap_tlv.c b/bgpd/bgp_encap_tlv.c
index fd429120e..fde11970c 100644
--- a/bgpd/bgp_encap_tlv.c
+++ b/bgpd/bgp_encap_tlv.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright 2015, LabN Consulting, L.L.C.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_encap_tlv.h b/bgpd/bgp_encap_tlv.h
index 64f9a9c74..e7188442d 100644
--- a/bgpd/bgp_encap_tlv.h
+++ b/bgpd/bgp_encap_tlv.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright 2015, LabN Consulting, L.L.C.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_ENCAP_TLV_H
diff --git a/bgpd/bgp_encap_types.h b/bgpd/bgp_encap_types.h
index 8d1bf682a..ea5b54c9e 100644
--- a/bgpd/bgp_encap_types.h
+++ b/bgpd/bgp_encap_types.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright 2015, LabN Consulting, L.L.C.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_ENCAP_TYPES_H
diff --git a/bgpd/bgp_errors.c b/bgpd/bgp_errors.c
index 8bc2dbca7..cfcefed99 100644
--- a/bgpd/bgp_errors.c
+++ b/bgpd/bgp_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Don Slice
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_errors.h b/bgpd/bgp_errors.h
index 4986c314a..4567f8783 100644
--- a/bgpd/bgp_errors.h
+++ b/bgpd/bgp_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Don Slice
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __BGP_ERRORS_H__
diff --git a/bgpd/bgp_evpn.c b/bgpd/bgp_evpn.c
index 5fdf02110..4758cd98e 100644
--- a/bgpd/bgp_evpn.c
+++ b/bgpd/bgp_evpn.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Ethernet-VPN Packet and vty Processing File
  * Copyright (C) 2016 6WIND
  * Copyright (C) 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_evpn.h b/bgpd/bgp_evpn.h
index 4f95b71b1..1dce4820d 100644
--- a/bgpd/bgp_evpn.h
+++ b/bgpd/bgp_evpn.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* E-VPN header for packet handling
  * Copyright (C) 2016 6WIND
- *
- * This file is part of FRRouting.
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_EVPN_H
diff --git a/bgpd/bgp_evpn_mh.c b/bgpd/bgp_evpn_mh.c
index bd32b4772..fa913016f 100644
--- a/bgpd/bgp_evpn_mh.c
+++ b/bgpd/bgp_evpn_mh.c
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* EVPN Multihoming procedures
  *
  * Copyright (C) 2019 Cumulus Networks, Inc.
  * Anuradha Karuppiah
  *
- * This file is part of FRR.
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_evpn_mh.h b/bgpd/bgp_evpn_mh.h
index 11030e323..613fece4d 100644
--- a/bgpd/bgp_evpn_mh.h
+++ b/bgpd/bgp_evpn_mh.h
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* EVPN header for multihoming procedures
  *
  * Copyright (C) 2019 Cumulus Networks
  * Anuradha Karuppiah
  *
- * This file is part of FRRouting.
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
  */
 
 #ifndef _FRR_BGP_EVPN_MH_H
diff --git a/bgpd/bgp_evpn_private.h b/bgpd/bgp_evpn_private.h
index 3f18e4e9f..d63e7a1a1 100644
--- a/bgpd/bgp_evpn_private.h
+++ b/bgpd/bgp_evpn_private.h
@@ -1,22 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP EVPN internal definitions
  * Copyright (C) 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _BGP_EVPN_PRIVATE_H
diff --git a/bgpd/bgp_evpn_vty.c b/bgpd/bgp_evpn_vty.c
index 6b63c6e3a..ceff7a46c 100644
--- a/bgpd/bgp_evpn_vty.c
+++ b/bgpd/bgp_evpn_vty.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Ethernet-VPN Packet and vty Processing File
  * Copyright (C) 2017 6WIND
  *
  * This file is part of FRRouting
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_evpn_vty.h b/bgpd/bgp_evpn_vty.h
index 8901644d7..83c41a5ad 100644
--- a/bgpd/bgp_evpn_vty.h
+++ b/bgpd/bgp_evpn_vty.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* EVPN VTY functions to EVPN
  * Copyright (C) 2017 6WIND
- *
- * This file is part of FRRouting.
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_EVPN_VTY_H
diff --git a/bgpd/bgp_filter.c b/bgpd/bgp_filter.c
index 892162295..fbea6862b 100644
--- a/bgpd/bgp_filter.c
+++ b/bgpd/bgp_filter.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* AS path filter list.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_filter.h b/bgpd/bgp_filter.h
index 66c83d97e..a294ebc69 100644
--- a/bgpd/bgp_filter.h
+++ b/bgpd/bgp_filter.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* AS path filter list.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_FILTER_H
diff --git a/bgpd/bgp_flowspec.c b/bgpd/bgp_flowspec.c
index b07625c49..6b35f7155 100644
--- a/bgpd/bgp_flowspec.c
+++ b/bgpd/bgp_flowspec.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP FlowSpec for packet handling
  * Portions:
  *     Copyright (C) 2017 ChinaTelecom SDN Group
  *     Copyright (C) 2018 6WIND
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_flowspec.h b/bgpd/bgp_flowspec.h
index d1a59a672..58fc1775a 100644
--- a/bgpd/bgp_flowspec.h
+++ b/bgpd/bgp_flowspec.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Flowspec header for packet handling
  * Copyright (C) 2018 6WIND
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_FLOWSPEC_H
diff --git a/bgpd/bgp_flowspec_private.h b/bgpd/bgp_flowspec_private.h
index 757a8ae2e..049cb6df7 100644
--- a/bgpd/bgp_flowspec_private.h
+++ b/bgpd/bgp_flowspec_private.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Flowspec header . private structs and defines
  * Copyright (C) 2018 6WIND
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_FLOWSPEC_PRIVATE_H
diff --git a/bgpd/bgp_flowspec_util.c b/bgpd/bgp_flowspec_util.c
index 191b9f16f..326d7f2ef 100644
--- a/bgpd/bgp_flowspec_util.c
+++ b/bgpd/bgp_flowspec_util.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP FlowSpec Utilities
  * Portions:
  *     Copyright (C) 2017 ChinaTelecom SDN Group
  *     Copyright (C) 2018 6WIND
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/bgpd/bgp_flowspec_util.h b/bgpd/bgp_flowspec_util.h
index 6cc4854d7..de1566083 100644
--- a/bgpd/bgp_flowspec_util.h
+++ b/bgpd/bgp_flowspec_util.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Flowspec header for utilities
  * Copyright (C) 2018 6WIND
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_FLOWSPEC_UTIL_H
diff --git a/bgpd/bgp_flowspec_vty.c b/bgpd/bgp_flowspec_vty.c
index 626e98034..7df1423e5 100644
--- a/bgpd/bgp_flowspec_vty.c
+++ b/bgpd/bgp_flowspec_vty.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP FlowSpec VTY
  * Copyright (C) 2018 6WIND
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_fsm.c b/bgpd/bgp_fsm.c
index 540d65311..59a8fcb92 100644
--- a/bgpd/bgp_fsm.c
+++ b/bgpd/bgp_fsm.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP-4 Finite State Machine
  * From RFC1771 [A Border Gateway Protocol 4 (BGP-4)]
  * Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_fsm.h b/bgpd/bgp_fsm.h
index a6e90612a..bd1a6adfe 100644
--- a/bgpd/bgp_fsm.h
+++ b/bgpd/bgp_fsm.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP-4 Finite State Machine
  * From RFC1771 [A Border Gateway Protocol 4 (BGP-4)]
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_FSM_H
diff --git a/bgpd/bgp_io.c b/bgpd/bgp_io.c
index f9dc64af4..530b77987 100644
--- a/bgpd/bgp_io.c
+++ b/bgpd/bgp_io.c
@@ -1,22 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP I/O.
  * Implements packet I/O in a pthread.
  * Copyright (C) 2017  Cumulus Networks
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 /* clang-format off */
diff --git a/bgpd/bgp_io.h b/bgpd/bgp_io.h
index 75d014f38..4c92373c2 100644
--- a/bgpd/bgp_io.h
+++ b/bgpd/bgp_io.h
@@ -1,22 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP I/O.
  * Implements packet I/O in a pthread.
  * Copyright (C) 2017  Cumulus Networks
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_IO_H
diff --git a/bgpd/bgp_keepalives.c b/bgpd/bgp_keepalives.c
index fb1237c02..b9e4d7c4c 100644
--- a/bgpd/bgp_keepalives.c
+++ b/bgpd/bgp_keepalives.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Keepalives.
  * Implements a producer thread to generate BGP keepalives for peers.
  * Copyright (C) 2017 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This file is part of FRRouting.
- *
- * FRRouting is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2, or (at your option) any later
- * version.
- *
- * FRRouting is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* clang-format off */
diff --git a/bgpd/bgp_keepalives.h b/bgpd/bgp_keepalives.h
index e8d0d3d40..2b4389cac 100644
--- a/bgpd/bgp_keepalives.h
+++ b/bgpd/bgp_keepalives.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Keepalives.
  * Implements a producer thread to generate BGP keepalives for peers.
  * Copyright (C) 2017 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This file is part of FRRouting.
- *
- * FRRouting is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2, or (at your option) any later
- * version.
- *
- * FRRouting is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_KEEPALIVES_H
diff --git a/bgpd/bgp_label.c b/bgpd/bgp_label.c
index 38f34a892..28fac0bed 100644
--- a/bgpd/bgp_label.c
+++ b/bgpd/bgp_label.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP carrying label information
  * Copyright (C) 2013 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_label.h b/bgpd/bgp_label.h
index 4061e8719..ac7fbb27f 100644
--- a/bgpd/bgp_label.h
+++ b/bgpd/bgp_label.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP carrying Label information
  * Copyright (C) 2013 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _BGP_LABEL_H
diff --git a/bgpd/bgp_labelpool.c b/bgpd/bgp_labelpool.c
index d60552011..f0f207442 100644
--- a/bgpd/bgp_labelpool.c
+++ b/bgpd/bgp_labelpool.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP Label Pool - Manage label chunk allocations from zebra asynchronously
  *
  * Copyright (C) 2018 LabN Consulting, L.L.C.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_labelpool.h b/bgpd/bgp_labelpool.h
index 2f3ffe437..955ab2d69 100644
--- a/bgpd/bgp_labelpool.h
+++ b/bgpd/bgp_labelpool.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP Label Pool - Manage label chunk allocations from zebra asynchronously
  *
  * Copyright (C) 2018 LabN Consulting, L.L.C.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_LABELPOOL_H
diff --git a/bgpd/bgp_lcommunity.c b/bgpd/bgp_lcommunity.c
index e0cca50d8..2329bcb6c 100644
--- a/bgpd/bgp_lcommunity.c
+++ b/bgpd/bgp_lcommunity.c
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Large Communities Attribute
  *
  * Copyright (C) 2016 Keyur Patel <keyur@arrcus.com>
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_lcommunity.h b/bgpd/bgp_lcommunity.h
index b9b5fe35d..151b79fa6 100644
--- a/bgpd/bgp_lcommunity.h
+++ b/bgpd/bgp_lcommunity.h
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Large Communities Attribute.
  *
  * Copyright (C) 2016 Keyur Patel <keyur@arrcus.com>
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_LCOMMUNITY_H
diff --git a/bgpd/bgp_mac.c b/bgpd/bgp_mac.c
index 52ffb1033..5d49175e4 100644
--- a/bgpd/bgp_mac.c
+++ b/bgpd/bgp_mac.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGPd - Mac hash code
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/bgpd/bgp_mac.h b/bgpd/bgp_mac.h
index 4b94d80d1..d97156103 100644
--- a/bgpd/bgp_mac.h
+++ b/bgpd/bgp_mac.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGPd - Mac hash header
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __BGP_MAC_H__
 #define __BGP_MAC_H__
diff --git a/bgpd/bgp_main.c b/bgpd/bgp_main.c
index 90ae580ba..85e490437 100644
--- a/bgpd/bgp_main.c
+++ b/bgpd/bgp_main.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Main routine of bgpd.
  * Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_memory.c b/bgpd/bgp_memory.c
index efa26e292..d7b18de67 100644
--- a/bgpd/bgp_memory.c
+++ b/bgpd/bgp_memory.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* bgpd memory type definitions
  *
  * Copyright (C) 2015  David Lamparter
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/bgpd/bgp_memory.h b/bgpd/bgp_memory.h
index c8542c5b8..7b0049771 100644
--- a/bgpd/bgp_memory.h
+++ b/bgpd/bgp_memory.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* bgpd memory type declarations
  *
  * Copyright (C) 2015  David Lamparter
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_MEMORY_H
diff --git a/bgpd/bgp_mpath.c b/bgpd/bgp_mpath.c
index 32a5e14b1..e920d5753 100644
--- a/bgpd/bgp_mpath.c
+++ b/bgpd/bgp_mpath.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP Multipath
  * Copyright (C) 2010 Google Inc.
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_mpath.h b/bgpd/bgp_mpath.h
index 4925f16dc..129682d1d 100644
--- a/bgpd/bgp_mpath.h
+++ b/bgpd/bgp_mpath.h
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP Multipath
  * Copyright (C) 2010 Google Inc.
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_MPATH_H
diff --git a/bgpd/bgp_mplsvpn.c b/bgpd/bgp_mplsvpn.c
index 33e7d971a..bd8ce5477 100644
--- a/bgpd/bgp_mplsvpn.c
+++ b/bgpd/bgp_mplsvpn.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* MPLS-VPN
  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_mplsvpn.h b/bgpd/bgp_mplsvpn.h
index b54476e5d..c832b4abd 100644
--- a/bgpd/bgp_mplsvpn.h
+++ b/bgpd/bgp_mplsvpn.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* MPLS-VPN
  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
  *
  * This file is part of GxNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_MPLSVPN_H
diff --git a/bgpd/bgp_mplsvpn_snmp.c b/bgpd/bgp_mplsvpn_snmp.c
index ea147e55b..95a7bb811 100644
--- a/bgpd/bgp_mplsvpn_snmp.c
+++ b/bgpd/bgp_mplsvpn_snmp.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* MPLS/BGP L3VPN MIB
  * Copyright (C) 2020 Volta Networks Inc
- *
- * This file is part of FRR.
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_mplsvpn_snmp.h b/bgpd/bgp_mplsvpn_snmp.h
index 781d5e98f..f7fa46c20 100644
--- a/bgpd/bgp_mplsvpn_snmp.h
+++ b/bgpd/bgp_mplsvpn_snmp.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* MPLS/BGP L3VPN MIB
  * Copyright (C) 2020 Volta Networks Inc
- *
- * This file is part of FRR.
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 void bgp_mpls_l3vpn_module_init(void);
diff --git a/bgpd/bgp_network.c b/bgpd/bgp_network.c
index 7186a5071..da89c594c 100644
--- a/bgpd/bgp_network.c
+++ b/bgpd/bgp_network.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP network related fucntions
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_network.h b/bgpd/bgp_network.h
index 7420397a9..f21b219e2 100644
--- a/bgpd/bgp_network.h
+++ b/bgpd/bgp_network.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP network related header
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_NETWORK_H
diff --git a/bgpd/bgp_nexthop.c b/bgpd/bgp_nexthop.c
index 77e26037c..a3014c0c6 100644
--- a/bgpd/bgp_nexthop.c
+++ b/bgpd/bgp_nexthop.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP nexthop scan
  * Copyright (C) 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_nexthop.h b/bgpd/bgp_nexthop.h
index d765bdd26..95e2f9165 100644
--- a/bgpd/bgp_nexthop.h
+++ b/bgpd/bgp_nexthop.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP nexthop scan
  * Copyright (C) 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_NEXTHOP_H
diff --git a/bgpd/bgp_nht.c b/bgpd/bgp_nht.c
index cf8ff524e..4f42766b9 100644
--- a/bgpd/bgp_nht.c
+++ b/bgpd/bgp_nht.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Nexthop tracking
  * Copyright (C) 2013 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_nht.h b/bgpd/bgp_nht.h
index 43f0aa26c..0758a0cf0 100644
--- a/bgpd/bgp_nht.h
+++ b/bgpd/bgp_nht.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP Nexthop tracking
  * Copyright (C) 2013 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _BGP_NHT_H
diff --git a/bgpd/bgp_open.c b/bgpd/bgp_open.c
index daae53525..032767820 100644
--- a/bgpd/bgp_open.c
+++ b/bgpd/bgp_open.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP open message handling
  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_open.h b/bgpd/bgp_open.h
index d1dc1c8a9..7e3d07876 100644
--- a/bgpd/bgp_open.h
+++ b/bgpd/bgp_open.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP open message handling
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_OPEN_H
diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
index 511bd00e7..93672d29f 100644
--- a/bgpd/bgp_packet.c
+++ b/bgpd/bgp_packet.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP packet management routine.
  * Contains utility functions for constructing and consuming BGP messages.
  * Copyright (C) 2017 Cumulus Networks
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_packet.h b/bgpd/bgp_packet.h
index 9f6d772bc..2eb5693ae 100644
--- a/bgpd/bgp_packet.h
+++ b/bgpd/bgp_packet.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP packet management header.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_PACKET_H
diff --git a/bgpd/bgp_pbr.c b/bgpd/bgp_pbr.c
index 807c4cd5a..7bced6cd3 100644
--- a/bgpd/bgp_pbr.c
+++ b/bgpd/bgp_pbr.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP pbr
  * Copyright (C) 6WIND
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/bgpd/bgp_pbr.h b/bgpd/bgp_pbr.h
index 379ac4067..ed143d9af 100644
--- a/bgpd/bgp_pbr.h
+++ b/bgpd/bgp_pbr.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP pbr
  * Copyright (C) 6WIND
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __BGP_PBR_H__
 #define __BGP_PBR_H__
diff --git a/bgpd/bgp_rd.c b/bgpd/bgp_rd.c
index b4bcbdb80..6e73ab8d1 100644
--- a/bgpd/bgp_rd.c
+++ b/bgpd/bgp_rd.c
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP RD definitions for BGP-based VPNs (IP/EVPN)
  * -- brought over from bgpd/bgp_mplsvpn.c
  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_rd.h b/bgpd/bgp_rd.h
index 2aee44c72..44173b7a2 100644
--- a/bgpd/bgp_rd.h
+++ b/bgpd/bgp_rd.h
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP RD definitions for BGP-based VPNs (IP/EVPN)
  * -- brought over from bgpd/bgp_mplsvpn.h
  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _QUAGGA_BGP_RD_H
diff --git a/bgpd/bgp_regex.c b/bgpd/bgp_regex.c
index 606568402..68137a557 100644
--- a/bgpd/bgp_regex.c
+++ b/bgpd/bgp_regex.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* AS regular expression routine
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_regex.h b/bgpd/bgp_regex.h
index e07b7f911..c2607bc3c 100644
--- a/bgpd/bgp_regex.h
+++ b/bgpd/bgp_regex.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* AS regular expression routine
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_REGEX_H
diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index 801ea1a2a..386c185cd 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP routing information
  * Copyright (C) 1996, 97, 98, 99 Kunihiro Ishiguro
  * Copyright (C) 2016 Job Snijders <job@instituut.net>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_route.h b/bgpd/bgp_route.h
index 452282926..11ec722f1 100644
--- a/bgpd/bgp_route.h
+++ b/bgpd/bgp_route.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP routing information base
  * Copyright (C) 1996, 97, 98, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_ROUTE_H
diff --git a/bgpd/bgp_routemap.c b/bgpd/bgp_routemap.c
index a1134bc2e..f9def0369 100644
--- a/bgpd/bgp_routemap.c
+++ b/bgpd/bgp_routemap.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Route map function of bgpd.
  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_routemap_nb.c b/bgpd/bgp_routemap_nb.c
index 35e470349..9188a40cc 100644
--- a/bgpd/bgp_routemap_nb.c
+++ b/bgpd/bgp_routemap_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/bgpd/bgp_routemap_nb.h b/bgpd/bgp_routemap_nb.h
index 933204415..07a1a6eb5 100644
--- a/bgpd/bgp_routemap_nb.h
+++ b/bgpd/bgp_routemap_nb.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_ROUTEMAP_NB_H_
diff --git a/bgpd/bgp_routemap_nb_config.c b/bgpd/bgp_routemap_nb_config.c
index 216bcc0b0..142bded6c 100644
--- a/bgpd/bgp_routemap_nb_config.c
+++ b/bgpd/bgp_routemap_nb_config.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_rpki.c b/bgpd/bgp_rpki.c
index 73c6fe0c4..61b8b4edc 100644
--- a/bgpd/bgp_rpki.c
+++ b/bgpd/bgp_rpki.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP RPKI
  * Copyright (C) 2013 Michael Mester (m.mester@fu-berlin.de), for FU Berlin
@@ -7,22 +8,6 @@
  * Hamburg
  * Copyright (C) 2017-2018 Marcel Röthke (marcel.roethke@haw-hamburg.de),
  * for HAW Hamburg
- *
- * This file is part of FRRouting.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* If rtrlib compiled with ssh support, don`t fail build */
diff --git a/bgpd/bgp_rpki.h b/bgpd/bgp_rpki.h
index 4dd4b4a2b..de28715d1 100644
--- a/bgpd/bgp_rpki.h
+++ b/bgpd/bgp_rpki.h
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * bgp_rpki code
  * Copyright (C) 2021 NVIDIA Corporation and Mellanox Technologies, LTD
  *                    All Rights Reserved
  *               Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __BGP_RPKI_H__
 #define __BGP_RPKI_H__
diff --git a/bgpd/bgp_script.c b/bgpd/bgp_script.c
index bf3e612bf..6cc75494e 100644
--- a/bgpd/bgp_script.c
+++ b/bgpd/bgp_script.c
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP scripting foo
  * Copyright (C) 2020  NVIDIA Corporation
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_script.h b/bgpd/bgp_script.h
index f8178aa98..f2f47e940 100644
--- a/bgpd/bgp_script.h
+++ b/bgpd/bgp_script.h
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP scripting foo
  * Copyright (C) 2020  NVIDIA Corporation
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 #ifndef __BGP_SCRIPT__
 #define __BGP_SCRIPT__
diff --git a/bgpd/bgp_snmp.c b/bgpd/bgp_snmp.c
index b202ec2e1..5aa5e1428 100644
--- a/bgpd/bgp_snmp.c
+++ b/bgpd/bgp_snmp.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP4 SNMP support
  * Copyright (C) 1999, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_snmp.h b/bgpd/bgp_snmp.h
index a89e82b6c..d324782ae 100644
--- a/bgpd/bgp_snmp.h
+++ b/bgpd/bgp_snmp.h
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Common header file for BGP SNMP implementation.
  *
  * Copyright (C) 2022 Donatas Abraitis <donatas@opensourcerouting.org>
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_SNMP_H_
diff --git a/bgpd/bgp_snmp_bgp4.c b/bgpd/bgp_snmp_bgp4.c
index 5bc2bb2dc..186c9e284 100644
--- a/bgpd/bgp_snmp_bgp4.c
+++ b/bgpd/bgp_snmp_bgp4.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP4 SNMP support
  * Copyright (C) 1999, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_snmp_bgp4.h b/bgpd/bgp_snmp_bgp4.h
index ac5119166..dffbf5fec 100644
--- a/bgpd/bgp_snmp_bgp4.h
+++ b/bgpd/bgp_snmp_bgp4.h
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP4-MIB SNMP support
  *
  * Using: http://www.circitor.fr/Mibs/Html/B/BGP4-MIB.php
  *
  * Copyright (C) 2022 Donatas Abraitis <donatas@opensourcerouting.org>
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_SNMP_BGP4_H_
diff --git a/bgpd/bgp_snmp_bgp4v2.c b/bgpd/bgp_snmp_bgp4v2.c
index 1755cd971..9c2599d5f 100644
--- a/bgpd/bgp_snmp_bgp4v2.c
+++ b/bgpd/bgp_snmp_bgp4v2.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP4V2-MIB SNMP support
  *
  * Copyright (C) 2022 Donatas Abraitis <donatas@opensourcerouting.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_snmp_bgp4v2.h b/bgpd/bgp_snmp_bgp4v2.h
index 8b474c388..67f45a617 100644
--- a/bgpd/bgp_snmp_bgp4v2.h
+++ b/bgpd/bgp_snmp_bgp4v2.h
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP4V2-MIB SNMP support
  *
  * Using: http://www.circitor.fr/Mibs/Html/B/BGP4V2-MIB.php
  *
  * Copyright (C) 2022 Donatas Abraitis <donatas@opensourcerouting.org>
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_SNMP_BGP4V2_H_
diff --git a/bgpd/bgp_table.c b/bgpd/bgp_table.c
index 0ca78d0bb..cb658c030 100644
--- a/bgpd/bgp_table.c
+++ b/bgpd/bgp_table.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP routing table
  * Copyright (C) 1998, 2001 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_table.h b/bgpd/bgp_table.h
index 121afc481..997efee9f 100644
--- a/bgpd/bgp_table.h
+++ b/bgpd/bgp_table.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP routing table
  * Copyright (C) 1998, 2001 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_TABLE_H
diff --git a/bgpd/bgp_trace.h b/bgpd/bgp_trace.h
index 7cc8f24e0..3213b29d9 100644
--- a/bgpd/bgp_trace.h
+++ b/bgpd/bgp_trace.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Tracing for BGP
  *
  * Copyright (C) 2020  NVIDIA Corporation
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #if !defined(_BGP_TRACE_H) || defined(TRACEPOINT_HEADER_MULTI_READ)
diff --git a/bgpd/bgp_updgrp.c b/bgpd/bgp_updgrp.c
index 9ca57f08d..a32cdb1ba 100644
--- a/bgpd/bgp_updgrp.c
+++ b/bgpd/bgp_updgrp.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * bgp_updgrp.c: BGP update group structures
  *
@@ -6,22 +7,6 @@
  * @author Avneesh Sachdev <avneesh@sproute.net>
  * @author Rajesh Varadarajan <rajesh@sproute.net>
  * @author Pradosh Mohapatra <pradosh@sproute.net>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_updgrp.h b/bgpd/bgp_updgrp.h
index e27c1e7b6..2b2fadcdf 100644
--- a/bgpd/bgp_updgrp.h
+++ b/bgpd/bgp_updgrp.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * bgp_updgrp.c: BGP update group structures
  *
@@ -6,22 +7,6 @@
  * @author Avneesh Sachdev <avneesh@sproute.net>
  * @author Rajesh Varadarajan <rajesh@sproute.net>
  * @author Pradosh Mohapatra <pradosh@sproute.net>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_UPDGRP_H
diff --git a/bgpd/bgp_updgrp_adv.c b/bgpd/bgp_updgrp_adv.c
index 9d75abe5d..9eefd2a63 100644
--- a/bgpd/bgp_updgrp_adv.c
+++ b/bgpd/bgp_updgrp_adv.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * bgp_updgrp_adv.c: BGP update group advertisement and adjacency
  *                   maintenance
@@ -8,22 +9,6 @@
  * @author Avneesh Sachdev <avneesh@sproute.net>
  * @author Rajesh Varadarajan <rajesh@sproute.net>
  * @author Pradosh Mohapatra <pradosh@sproute.net>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_updgrp_packet.c b/bgpd/bgp_updgrp_packet.c
index 346a3e780..5106dcf35 100644
--- a/bgpd/bgp_updgrp_packet.c
+++ b/bgpd/bgp_updgrp_packet.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * bgp_updgrp_packet.c: BGP update group packet handling routines
  *
@@ -6,22 +7,6 @@
  * @author Avneesh Sachdev <avneesh@sproute.net>
  * @author Rajesh Varadarajan <rajesh@sproute.net>
  * @author Pradosh Mohapatra <pradosh@sproute.net>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_vnc_types.h b/bgpd/bgp_vnc_types.h
index 04847ce6c..b08af9f18 100644
--- a/bgpd/bgp_vnc_types.h
+++ b/bgpd/bgp_vnc_types.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright 2015-2016, LabN Consulting, L.L.C.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_VNC_TYPES_H
diff --git a/bgpd/bgp_vpn.c b/bgpd/bgp_vpn.c
index 6308936aa..0ed1d04d8 100644
--- a/bgpd/bgp_vpn.c
+++ b/bgpd/bgp_vpn.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* VPN Related functions
  * Copyright (C) 2017 6WIND
  *
  * This file is part of FRRouting
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_vpn.h b/bgpd/bgp_vpn.h
index a2e86476a..dedd0d66e 100644
--- a/bgpd/bgp_vpn.h
+++ b/bgpd/bgp_vpn.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* VPN common functions to MP-BGP
  * Copyright (C) 2017 6WIND
- *
- * This file is part of FRRouting.
- *
- * FRRouting is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRRouting is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_BGP_VPN_H
diff --git a/bgpd/bgp_vty.c b/bgpd/bgp_vty.c
index 810938e12..b858d9c4b 100644
--- a/bgpd/bgp_vty.c
+++ b/bgpd/bgp_vty.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP VTY interface.
  * Copyright (C) 1996, 97, 98, 99, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_vty.h b/bgpd/bgp_vty.h
index 820fc4429..56485035e 100644
--- a/bgpd/bgp_vty.h
+++ b/bgpd/bgp_vty.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP VTY interface.
  * Copyright (C) 1996, 97, 98, 99, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_VTY_H
diff --git a/bgpd/bgp_zebra.c b/bgpd/bgp_zebra.c
index 3a6198990..d05768da0 100644
--- a/bgpd/bgp_zebra.c
+++ b/bgpd/bgp_zebra.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra client
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgp_zebra.h b/bgpd/bgp_zebra.h
index 0a4106941..8a0203c32 100644
--- a/bgpd/bgp_zebra.h
+++ b/bgpd/bgp_zebra.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra connection and redistribute fucntions.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_ZEBRA_H
diff --git a/bgpd/bgpd.c b/bgpd/bgpd.c
index a09d25e8a..9ea5a92ad 100644
--- a/bgpd/bgpd.c
+++ b/bgpd/bgpd.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP-4, BGP-4+ daemon program
  * Copyright (C) 1996, 97, 98, 99, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/bgpd/bgpd.h b/bgpd/bgpd.h
index a8bb7a511..b5faa4d35 100644
--- a/bgpd/bgpd.h
+++ b/bgpd/bgpd.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* BGP message definition header.
  * Copyright (C) 1996, 97, 98, 99, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGPD_H
diff --git a/bgpd/rfapi/bgp_rfapi_cfg.c b/bgpd/rfapi/bgp_rfapi_cfg.c
index b65d90e1b..40cb8f8d5 100644
--- a/bgpd/rfapi/bgp_rfapi_cfg.c
+++ b/bgpd/rfapi/bgp_rfapi_cfg.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "lib/zebra.h"
 
diff --git a/bgpd/rfapi/bgp_rfapi_cfg.h b/bgpd/rfapi/bgp_rfapi_cfg.h
index ef97419c4..77549ad82 100644
--- a/bgpd/rfapi/bgp_rfapi_cfg.h
+++ b/bgpd/rfapi/bgp_rfapi_cfg.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_RFAPI_CFG_H
diff --git a/bgpd/rfapi/rfapi.c b/bgpd/rfapi/rfapi.c
index 80d0b3e26..0c8fdc72e 100644
--- a/bgpd/rfapi/rfapi.c
+++ b/bgpd/rfapi/rfapi.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "lib/zebra.h"
diff --git a/bgpd/rfapi/rfapi.h b/bgpd/rfapi/rfapi.h
index b2079fb13..44f7507d5 100644
--- a/bgpd/rfapi/rfapi.h
+++ b/bgpd/rfapi/rfapi.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_RFAPI_H
diff --git a/bgpd/rfapi/rfapi_ap.c b/bgpd/rfapi/rfapi_ap.c
index fcc6168cf..fe344a565 100644
--- a/bgpd/rfapi/rfapi_ap.c
+++ b/bgpd/rfapi/rfapi_ap.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "lib/zebra.h"
diff --git a/bgpd/rfapi/rfapi_ap.h b/bgpd/rfapi/rfapi_ap.h
index 56977bd24..7698fbaed 100644
--- a/bgpd/rfapi/rfapi_ap.h
+++ b/bgpd/rfapi/rfapi_ap.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _QUAGGA_BGP_RFAPI_AP_H
 #define _QUAGGA_BGP_RFAPI_AP_H
diff --git a/bgpd/rfapi/rfapi_backend.h b/bgpd/rfapi/rfapi_backend.h
index 4d2ae0b02..3870c31fc 100644
--- a/bgpd/rfapi/rfapi_backend.h
+++ b/bgpd/rfapi/rfapi_backend.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_RFAPI_BACKEND_H
diff --git a/bgpd/rfapi/rfapi_descriptor_rfp_utils.c b/bgpd/rfapi/rfapi_descriptor_rfp_utils.c
index ce5acf002..28326ab9e 100644
--- a/bgpd/rfapi/rfapi_descriptor_rfp_utils.c
+++ b/bgpd/rfapi/rfapi_descriptor_rfp_utils.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "lib/zebra.h"
diff --git a/bgpd/rfapi/rfapi_descriptor_rfp_utils.h b/bgpd/rfapi/rfapi_descriptor_rfp_utils.h
index dcc197961..9e65a70b1 100644
--- a/bgpd/rfapi/rfapi_descriptor_rfp_utils.h
+++ b/bgpd/rfapi/rfapi_descriptor_rfp_utils.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/bgpd/rfapi/rfapi_encap_tlv.c b/bgpd/rfapi/rfapi_encap_tlv.c
index dc0c382dc..37a732615 100644
--- a/bgpd/rfapi/rfapi_encap_tlv.c
+++ b/bgpd/rfapi/rfapi_encap_tlv.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright 2015-2016, LabN Consulting, L.L.C.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "lib/zebra.h"
diff --git a/bgpd/rfapi/rfapi_encap_tlv.h b/bgpd/rfapi/rfapi_encap_tlv.h
index 57e1b5ef0..56131d8b8 100644
--- a/bgpd/rfapi/rfapi_encap_tlv.h
+++ b/bgpd/rfapi/rfapi_encap_tlv.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright 2015-2016, LabN Consulting, L.L.C.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_RFAPI_ENCAP_TLV_H
diff --git a/bgpd/rfapi/rfapi_import.c b/bgpd/rfapi/rfapi_import.c
index 5db40be36..6d4fc53f8 100644
--- a/bgpd/rfapi/rfapi_import.c
+++ b/bgpd/rfapi/rfapi_import.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
-*
-* Copyright 2009-2016, LabN Consulting, L.L.C.
-*
-*
-* This program is free software; you can redistribute it and/or
-* modify it under the terms of the GNU General Public License
-* as published by the Free Software Foundation; either version 2
-* of the License, or (at your option) any later version.
-*
-* This program is distributed in the hope that it will be useful,
-* but WITHOUT ANY WARRANTY; without even the implied warranty of
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-* GNU General Public License for more details.
-*
-* You should have received a copy of the GNU General Public License along
-* with this program; see the file COPYING; if not, write to the Free Software
-* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-*/
+ * Copyright 2009-2016, LabN Consulting, L.L.C.
+ */
 
 /*
  * File:	rfapi_import.c
diff --git a/bgpd/rfapi/rfapi_import.h b/bgpd/rfapi/rfapi_import.h
index 387e6c47c..3bec225f6 100644
--- a/bgpd/rfapi/rfapi_import.h
+++ b/bgpd/rfapi/rfapi_import.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/bgpd/rfapi/rfapi_monitor.c b/bgpd/rfapi/rfapi_monitor.c
index f333e8cc5..f169a7808 100644
--- a/bgpd/rfapi/rfapi_monitor.c
+++ b/bgpd/rfapi/rfapi_monitor.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/bgpd/rfapi/rfapi_monitor.h b/bgpd/rfapi/rfapi_monitor.h
index 3a2248aa6..68ba5a48d 100644
--- a/bgpd/rfapi/rfapi_monitor.h
+++ b/bgpd/rfapi/rfapi_monitor.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef QUAGGA_HGP_RFAPI_MONITOR_H
diff --git a/bgpd/rfapi/rfapi_nve_addr.c b/bgpd/rfapi/rfapi_nve_addr.c
index b8193f143..eabec2fdd 100644
--- a/bgpd/rfapi/rfapi_nve_addr.c
+++ b/bgpd/rfapi/rfapi_nve_addr.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/bgpd/rfapi/rfapi_nve_addr.h b/bgpd/rfapi/rfapi_nve_addr.h
index 7bcb3cab6..49e9fc5d6 100644
--- a/bgpd/rfapi/rfapi_nve_addr.h
+++ b/bgpd/rfapi/rfapi_nve_addr.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_RFAPI_NVE_ADDR_H
diff --git a/bgpd/rfapi/rfapi_private.h b/bgpd/rfapi/rfapi_private.h
index 8c76e1dd0..2161d43ba 100644
--- a/bgpd/rfapi/rfapi_private.h
+++ b/bgpd/rfapi/rfapi_private.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/bgpd/rfapi/rfapi_rib.c b/bgpd/rfapi/rfapi_rib.c
index 50a10c3b1..b15620741 100644
--- a/bgpd/rfapi/rfapi_rib.c
+++ b/bgpd/rfapi/rfapi_rib.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/bgpd/rfapi/rfapi_rib.h b/bgpd/rfapi/rfapi_rib.h
index 3ad021b4f..1b626bd2e 100644
--- a/bgpd/rfapi/rfapi_rib.h
+++ b/bgpd/rfapi/rfapi_rib.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/bgpd/rfapi/rfapi_vty.c b/bgpd/rfapi/rfapi_vty.c
index e04938fde..0144c28d5 100644
--- a/bgpd/rfapi/rfapi_vty.c
+++ b/bgpd/rfapi/rfapi_vty.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "lib/zebra.h"
diff --git a/bgpd/rfapi/rfapi_vty.h b/bgpd/rfapi/rfapi_vty.h
index c8b8613fe..a56370198 100644
--- a/bgpd/rfapi/rfapi_vty.h
+++ b/bgpd/rfapi/rfapi_vty.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef RFAPI_VTY_H
diff --git a/bgpd/rfapi/vnc_debug.c b/bgpd/rfapi/vnc_debug.c
index 322f98e16..eb0d86190 100644
--- a/bgpd/rfapi/vnc_debug.c
+++ b/bgpd/rfapi/vnc_debug.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2016, LabN Consulting, L.L.C.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "lib/zebra.h"
diff --git a/bgpd/rfapi/vnc_debug.h b/bgpd/rfapi/vnc_debug.h
index c472b6366..c7751277c 100644
--- a/bgpd/rfapi/vnc_debug.h
+++ b/bgpd/rfapi/vnc_debug.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2016, LabN Consulting, L.L.C.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_BGP_VNC_DEBUG_H
diff --git a/bgpd/rfapi/vnc_export_bgp.c b/bgpd/rfapi/vnc_export_bgp.c
index 05e45bc4c..e7cc278df 100644
--- a/bgpd/rfapi/vnc_export_bgp.c
+++ b/bgpd/rfapi/vnc_export_bgp.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/bgpd/rfapi/vnc_export_bgp.h b/bgpd/rfapi/vnc_export_bgp.h
index a6f8c82c0..9ea20b195 100644
--- a/bgpd/rfapi/vnc_export_bgp.h
+++ b/bgpd/rfapi/vnc_export_bgp.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_RFAPI_VNC_EXPORT_BGP_H_
diff --git a/bgpd/rfapi/vnc_export_bgp_p.h b/bgpd/rfapi/vnc_export_bgp_p.h
index bf292abb0..8f5b6137c 100644
--- a/bgpd/rfapi/vnc_export_bgp_p.h
+++ b/bgpd/rfapi/vnc_export_bgp_p.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_RFAPI_VNC_EXPORT_BGP_P_H_
diff --git a/bgpd/rfapi/vnc_export_table.c b/bgpd/rfapi/vnc_export_table.c
index 743576d26..4b6bacae9 100644
--- a/bgpd/rfapi/vnc_export_table.c
+++ b/bgpd/rfapi/vnc_export_table.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/bgpd/rfapi/vnc_export_table.h b/bgpd/rfapi/vnc_export_table.h
index 8a1fc9aae..42c04f0c7 100644
--- a/bgpd/rfapi/vnc_export_table.h
+++ b/bgpd/rfapi/vnc_export_table.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_VNC_VNC_EXPORT_TABLE_H_
diff --git a/bgpd/rfapi/vnc_import_bgp.c b/bgpd/rfapi/vnc_import_bgp.c
index acbc41391..7c8e8f35c 100644
--- a/bgpd/rfapi/vnc_import_bgp.c
+++ b/bgpd/rfapi/vnc_import_bgp.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/bgpd/rfapi/vnc_import_bgp.h b/bgpd/rfapi/vnc_import_bgp.h
index ab2ec1a74..c8d4170c6 100644
--- a/bgpd/rfapi/vnc_import_bgp.h
+++ b/bgpd/rfapi/vnc_import_bgp.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_RFAPI_VNC_IMPORT_BGP_H_
diff --git a/bgpd/rfapi/vnc_import_bgp_p.h b/bgpd/rfapi/vnc_import_bgp_p.h
index c6627dfba..7019796c4 100644
--- a/bgpd/rfapi/vnc_import_bgp_p.h
+++ b/bgpd/rfapi/vnc_import_bgp_p.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_RFAPI_VNC_IMPORT_BGP_P_H_
diff --git a/bgpd/rfapi/vnc_zebra.c b/bgpd/rfapi/vnc_zebra.c
index fe818987b..4dab0bc33 100644
--- a/bgpd/rfapi/vnc_zebra.c
+++ b/bgpd/rfapi/vnc_zebra.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/bgpd/rfapi/vnc_zebra.h b/bgpd/rfapi/vnc_zebra.h
index b8c1cb15c..6d7e68905 100644
--- a/bgpd/rfapi/vnc_zebra.h
+++ b/bgpd/rfapi/vnc_zebra.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2009-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/bgpd/rfp-example/librfp/rfp.h b/bgpd/rfp-example/librfp/rfp.h
index ecb0c7990..ae74fed82 100644
--- a/bgpd/rfp-example/librfp/rfp.h
+++ b/bgpd/rfp-example/librfp/rfp.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2015-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* Sample header file */
diff --git a/bgpd/rfp-example/librfp/rfp_example.c b/bgpd/rfp-example/librfp/rfp_example.c
index 9a4ec7dbf..3a512902e 100644
--- a/bgpd/rfp-example/librfp/rfp_example.c
+++ b/bgpd/rfp-example/librfp/rfp_example.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2015-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/bgpd/rfp-example/librfp/rfp_internal.h b/bgpd/rfp-example/librfp/rfp_internal.h
index f54f40dd1..83b0b55c0 100644
--- a/bgpd/rfp-example/librfp/rfp_internal.h
+++ b/bgpd/rfp-example/librfp/rfp_internal.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2015-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* Sample header file */
diff --git a/bgpd/rfp-example/rfptest/rfptest.c b/bgpd/rfp-example/rfptest/rfptest.c
index 1036829b8..e57f8b088 100644
--- a/bgpd/rfp-example/rfptest/rfptest.c
+++ b/bgpd/rfp-example/rfptest/rfptest.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2015-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/bgpd/rfp-example/rfptest/rfptest.h b/bgpd/rfp-example/rfptest/rfptest.h
index 1f0ccb8c4..66f70ae04 100644
--- a/bgpd/rfp-example/rfptest/rfptest.h
+++ b/bgpd/rfp-example/rfptest/rfptest.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright 2015-2016, LabN Consulting, L.L.C.
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* Sample header file */
diff --git a/buildtest.sh b/buildtest.sh
index eeae82fc4..7edc4a5ee 100755
--- a/buildtest.sh
+++ b/buildtest.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+# SPDX-License-Identifier: NONE
 # written 2012-2013 by David Lamparter, placed in Public Domain.
 #
 # builds some git commit of FRR in some different configurations
diff --git a/doc/developer/workflow.rst b/doc/developer/workflow.rst
index f49690610..320824ec1 100644
--- a/doc/developer/workflow.rst
+++ b/doc/developer/workflow.rst
@@ -671,33 +671,36 @@ above) added to the file. The header should be:
 
 .. code-block:: c
 
+    // SPDX-License-Identifier: GPL-2.0-or-later
     /*
      * Title/Function of file
      * Copyright (C) YEAR  Author’s Name
-     *
-     * This program is free software; you can redistribute it and/or modify it
-     * under the terms of the GNU General Public License as published by the Free
-     * Software Foundation; either version 2 of the License, or (at your option)
-     * any later version.
-     *
-     * This program is distributed in the hope that it will be useful, but WITHOUT
-     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-     * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-     * more details.
-     *
-     * You should have received a copy of the GNU General Public License along
-     * with this program; see the file COPYING; if not, write to the Free Software
-     * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
      */
 
     #include <zebra.h>
 
-Please copy-paste this header verbatim. In particular:
+A ``SPDX-License-Identifier`` header is required in all source files, i.e.
+``.c``, ``.h``, ``.cpp`` and ``.py`` files.  The license boilerplate should be
+removed in these files.  Some existing files are missing this header, this is
+slowly being fixed.
+
+A ``SPDX-License-Identifier`` header *and* the full license boilerplate is
+required in schema definition files, i.e. ``.yang`` and ``.proto``.  The
+rationale for this is that these files are likely to be individually copied to
+places outside FRR, and having only the SPDX header would become a "dangling
+pointer".
+
+.. warning::
+
+   **DO NOT REMOVE A "Copyright" LINE OR AUTHOR NAME, EVER.**
+
+   **DO NOT APPLY AN SPDX HEADER WHEN THE LICENSE IS UNCLEAR, UNLESS YOU HAVE
+   CHECKED WITH *ALL* SIGNIFICANT AUTHORS.**
+
+Please to keep ``#include <zebra.h>``.  The absolute first header included in
+any C file **must** be either ``zebra.h`` or ``config.h`` (with HAVE_CONFIG_H
+guard.)
 
-- Do not replace "This program" with "FRR"
-- Do not change the address of the FSF
-- keep ``#include <zebra.h>``.  The absolute first header included in any C
-  file **must** be either ``zebra.h`` or ``config.h`` (with HAVE_CONFIG_H guard)
 
 Adding Copyright Claims to Existing Files
 -----------------------------------------
diff --git a/doc/extra/frrlexer.py b/doc/extra/frrlexer.py
index e177c3983..39ce5e620 100644
--- a/doc/extra/frrlexer.py
+++ b/doc/extra/frrlexer.py
@@ -1,17 +1,6 @@
 # -*- coding: utf-8 -*-
+# SPDX-License-Identifier: ISC
 # Copyright (c) 2017 Vincent Bernat <bernat@luffy.cx>
-#
-# Permission to use, copy, modify, and/or distribute this software for any
-# purpose with or without fee is hereby granted, provided that the above
-# copyright notice and this permission notice appear in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 from pygments.lexer import RegexLexer, bygroups
 from pygments.token import Text, Comment, Keyword
diff --git a/doc/licenses/BSD-2-Clause b/doc/licenses/BSD-2-Clause
new file mode 100644
index 000000000..d11142d7b
--- /dev/null
+++ b/doc/licenses/BSD-2-Clause
@@ -0,0 +1,19 @@
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/doc/licenses/BSD-3-Clause b/doc/licenses/BSD-3-Clause
new file mode 100644
index 000000000..46b46ec5f
--- /dev/null
+++ b/doc/licenses/BSD-3-Clause
@@ -0,0 +1,23 @@
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of the project nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
diff --git a/pimd/COPYING b/doc/licenses/GPL-2.0
index 3912109b5..d159169d1 100644
--- a/pimd/COPYING
+++ b/doc/licenses/GPL-2.0
@@ -1,12 +1,12 @@
-		    GNU GENERAL PUBLIC LICENSE
-		       Version 2, June 1991
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
 
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.
-                       51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
-			    Preamble
+                            Preamble
 
   The licenses for most software are designed to take away your
 freedom to share and change it.  By contrast, the GNU General Public
@@ -15,7 +15,7 @@ software--to make sure the software is free for all its users.  This
 General Public License applies to most of the Free Software
 Foundation's software and to any other program whose authors commit to
 using it.  (Some other Free Software Foundation software is covered by
-the GNU Library General Public License instead.)  You can apply it to
+the GNU Lesser General Public License instead.)  You can apply it to
 your programs, too.
 
   When we speak of free software, we are referring to freedom, not
@@ -55,8 +55,8 @@ patent must be licensed for everyone's free use or not licensed at all.
 
   The precise terms and conditions for copying, distribution and
 modification follow.
-
-		    GNU GENERAL PUBLIC LICENSE
+
+                    GNU GENERAL PUBLIC LICENSE
    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 
   0. This License applies to any program or other work which contains
@@ -110,7 +110,7 @@ above, provided that you also meet all of these conditions:
     License.  (Exception: if the Program itself is interactive but
     does not normally print such an announcement, your work based on
     the Program is not required to print an announcement.)
-
+
 These requirements apply to the modified work as a whole.  If
 identifiable sections of that work are not derived from the Program,
 and can be reasonably considered independent and separate works in
@@ -168,7 +168,7 @@ access to copy from a designated place, then offering equivalent
 access to copy the source code from the same place counts as
 distribution of the source code, even though third parties are not
 compelled to copy the source along with the object code.
-
+
   4. You may not copy, modify, sublicense, or distribute the Program
 except as expressly provided under this License.  Any attempt
 otherwise to copy, modify, sublicense or distribute the Program is
@@ -225,7 +225,7 @@ impose that choice.
 
 This section is intended to make thoroughly clear what is believed to
 be a consequence of the rest of this License.
-
+
   8. If the distribution and/or use of the Program is restricted in
 certain countries either by patents or by copyrighted interfaces, the
 original copyright holder who places the Program under this License
@@ -255,7 +255,7 @@ make exceptions for this.  Our decision will be guided by the two goals
 of preserving the free status of all derivatives of our free software and
 of promoting the sharing and reuse of software generally.
 
-			    NO WARRANTY
+                            NO WARRANTY
 
   11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
@@ -277,9 +277,9 @@ YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGES.
 
-		     END OF TERMS AND CONDITIONS
-
-	    How to Apply These Terms to Your New Programs
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
 
   If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
@@ -303,10 +303,9 @@ the "copyright" line and a pointer to where the full notice is found.
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
 Also add information on how to contact you by electronic and paper mail.
 
@@ -336,5 +335,5 @@ necessary.  Here is a sample; alter the names:
 This General Public License does not permit incorporating your program into
 proprietary programs.  If your program is a subroutine library, you may
 consider it more useful to permit linking proprietary applications with the
-library.  If this is what you want to do, use the GNU Library General
+library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.
diff --git a/tools/gcc-plugins/COPYING.GPLv3 b/doc/licenses/GPL-3.0
index 94a9ed024..94a9ed024 100644
--- a/tools/gcc-plugins/COPYING.GPLv3
+++ b/doc/licenses/GPL-3.0
diff --git a/doc/licenses/ISC b/doc/licenses/ISC
new file mode 100644
index 000000000..02add5e7c
--- /dev/null
+++ b/doc/licenses/ISC
@@ -0,0 +1,11 @@
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/COPYING-LGPLv2.1 b/doc/licenses/LGPL-2.1
index 4362b4915..4362b4915 100644
--- a/COPYING-LGPLv2.1
+++ b/doc/licenses/LGPL-2.1
diff --git a/doc/licenses/LicenseRef-Skiplist-BSD-0-Clause b/doc/licenses/LicenseRef-Skiplist-BSD-0-Clause
new file mode 100644
index 000000000..764f7cc7b
--- /dev/null
+++ b/doc/licenses/LicenseRef-Skiplist-BSD-0-Clause
@@ -0,0 +1,15 @@
+Redistribution and use in source and binary forms, with or without
+modification, are permitted.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
diff --git a/babeld/LICENCE b/doc/licenses/MIT
index 2a340a4db..73e41b1f6 100644
--- a/babeld/LICENCE
+++ b/doc/licenses/MIT
@@ -1,5 +1,3 @@
-Copyright (c) 2007, 2008 by Juliusz Chroboczek
-
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
diff --git a/doc/licenses/Unlicense b/doc/licenses/Unlicense
new file mode 100644
index 000000000..efb980881
--- /dev/null
+++ b/doc/licenses/Unlicense
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org/>
diff --git a/eigrpd/eigrp_cli.c b/eigrpd/eigrp_cli.c
index 2afd9d5ea..213834afc 100644
--- a/eigrpd/eigrp_cli.c
+++ b/eigrpd/eigrp_cli.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP daemon CLI implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_cli.h b/eigrpd/eigrp_cli.h
index 8b16dea39..ed7b27477 100644
--- a/eigrpd/eigrp_cli.h
+++ b/eigrpd/eigrp_cli.h
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP CLI Functions.
  * Copyright (C) 2019
  * Authors:
  *   Donnie Savage
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _EIGRP_CLI_H_
diff --git a/eigrpd/eigrp_const.h b/eigrpd/eigrp_const.h
index 149cf00ef..607719d4f 100644
--- a/eigrpd/eigrp_const.h
+++ b/eigrpd/eigrp_const.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Definition of Constants.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_CONST_H_
diff --git a/eigrpd/eigrp_dump.c b/eigrpd/eigrp_dump.c
index b0d34f55e..489b3bd1c 100644
--- a/eigrpd/eigrp_dump.c
+++ b/eigrpd/eigrp_dump.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Dump Functions and Debugging.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_dump.h b/eigrpd/eigrp_dump.h
index 0d512fc63..7a952f099 100644
--- a/eigrpd/eigrp_dump.h
+++ b/eigrpd/eigrp_dump.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Dump Functions and Debbuging.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRPD_DUMP_H_
diff --git a/eigrpd/eigrp_errors.c b/eigrpd/eigrp_errors.c
index 75cf95355..9991fd57b 100644
--- a/eigrpd/eigrp_errors.c
+++ b/eigrpd/eigrp_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_errors.h b/eigrpd/eigrp_errors.h
index 3270e6513..885702bd0 100644
--- a/eigrpd/eigrp_errors.h
+++ b/eigrpd/eigrp_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __EIGRP_ERRORS_H__
diff --git a/eigrpd/eigrp_filter.c b/eigrpd/eigrp_filter.c
index 8d50ed689..09ae6be6d 100644
--- a/eigrpd/eigrp_filter.c
+++ b/eigrpd/eigrp_filter.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Filter Functions.
  * Copyright (C) 2013-2015
@@ -12,22 +13,6 @@
  *   Martin Kontsek
  *   Lukas Koribsky
  *
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_filter.h b/eigrpd/eigrp_filter.h
index 4dbfe276d..493ba08f7 100644
--- a/eigrpd/eigrp_filter.h
+++ b/eigrpd/eigrp_filter.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Filter Functions.
  * Copyright (C) 2013-2016
@@ -12,22 +13,6 @@
  *   Martin Kontsek
  *   Lukas Koribsky
  *
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef EIGRPD_EIGRP_FILTER_H_
diff --git a/eigrpd/eigrp_fsm.c b/eigrpd/eigrp_fsm.c
index d2d435bf2..d065af0cb 100644
--- a/eigrpd/eigrp_fsm.c
+++ b/eigrpd/eigrp_fsm.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRPd Finite State Machine (DUAL).
  * Copyright (C) 2013-2014
@@ -8,22 +9,6 @@
  *   Peter Orsag
  *   Peter Paluch
  *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
  * This file contains functions for executing logic of finite state machine
  *
  *                                +------------ +
diff --git a/eigrpd/eigrp_fsm.h b/eigrpd/eigrp_fsm.h
index 8fad9d1f5..e9c5223a7 100644
--- a/eigrpd/eigrp_fsm.h
+++ b/eigrpd/eigrp_fsm.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Finite State Machine (DUAL).
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_FSM_H
diff --git a/eigrpd/eigrp_hello.c b/eigrpd/eigrp_hello.c
index 717d8c095..f62f54b68 100644
--- a/eigrpd/eigrp_hello.c
+++ b/eigrpd/eigrp_hello.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Sending and Receiving EIGRP Hello Packets.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_interface.c b/eigrpd/eigrp_interface.c
index 891d28230..8d98dcf5a 100644
--- a/eigrpd/eigrp_interface.c
+++ b/eigrpd/eigrp_interface.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Interface Functions.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_interface.h b/eigrpd/eigrp_interface.h
index 68ab5125e..76f9c1bcb 100644
--- a/eigrpd/eigrp_interface.h
+++ b/eigrpd/eigrp_interface.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Interface Functions.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_INTERFACE_H_
diff --git a/eigrpd/eigrp_macros.h b/eigrpd/eigrp_macros.h
index b30e19a86..b7cd22fee 100644
--- a/eigrpd/eigrp_macros.h
+++ b/eigrpd/eigrp_macros.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Macros Definition.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_MACROS_H_
diff --git a/eigrpd/eigrp_main.c b/eigrpd/eigrp_main.c
index a8936dfc3..3c1e5da34 100644
--- a/eigrpd/eigrp_main.c
+++ b/eigrpd/eigrp_main.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Main Routine.
  * Copyright (C) 2013-2015
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/eigrpd/eigrp_metric.c b/eigrpd/eigrp_metric.c
index 7ccafd4fa..1662f48c8 100644
--- a/eigrpd/eigrp_metric.c
+++ b/eigrpd/eigrp_metric.c
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Metric Math Functions.
  * Copyright (C) 2013-2016
  * Authors:
  *   Donnie Savage
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_metric.h b/eigrpd/eigrp_metric.h
index 8e9cd6674..d4a8d09e5 100644
--- a/eigrpd/eigrp_metric.h
+++ b/eigrpd/eigrp_metric.h
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Metric Math Functions.
  * Copyright (C) 2013-2016
  * Authors:
  *   Donnie Savage
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_METRIC_H_
diff --git a/eigrpd/eigrp_neighbor.c b/eigrpd/eigrp_neighbor.c
index 0ed8927d4..9288b0f1c 100644
--- a/eigrpd/eigrp_neighbor.c
+++ b/eigrpd/eigrp_neighbor.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Neighbor Handling.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_neighbor.h b/eigrpd/eigrp_neighbor.h
index 693d780f0..5c9e44e2b 100644
--- a/eigrpd/eigrp_neighbor.h
+++ b/eigrpd/eigrp_neighbor.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Neighbor Handling.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_NEIGHBOR_H
diff --git a/eigrpd/eigrp_network.c b/eigrpd/eigrp_network.c
index 13db38ce9..68edd0898 100644
--- a/eigrpd/eigrp_network.c
+++ b/eigrpd/eigrp_network.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Network Related Functions.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_network.h b/eigrpd/eigrp_network.h
index 912a9248c..33d91c2fb 100644
--- a/eigrpd/eigrp_network.h
+++ b/eigrpd/eigrp_network.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Network Related Functions.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_NETWORK_H
diff --git a/eigrpd/eigrp_northbound.c b/eigrpd/eigrp_northbound.c
index a0f8452c9..74a4dcb85 100644
--- a/eigrpd/eigrp_northbound.c
+++ b/eigrpd/eigrp_northbound.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP daemon northbound implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_packet.c b/eigrpd/eigrp_packet.c
index 1ea6f9813..e00d62fb0 100644
--- a/eigrpd/eigrp_packet.c
+++ b/eigrpd/eigrp_packet.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP General Sending and Receiving of EIGRP Packets.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_packet.h b/eigrpd/eigrp_packet.h
index f65917666..4c1cfd482 100644
--- a/eigrpd/eigrp_packet.h
+++ b/eigrpd/eigrp_packet.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP General Sending and Receiving of EIGRP Packets.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_PACKET_H
diff --git a/eigrpd/eigrp_query.c b/eigrpd/eigrp_query.c
index c8769fb11..56498ed67 100644
--- a/eigrpd/eigrp_query.c
+++ b/eigrpd/eigrp_query.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Sending and Receiving EIGRP Query Packets.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_reply.c b/eigrpd/eigrp_reply.c
index 015daa768..a1413fe9c 100644
--- a/eigrpd/eigrp_reply.c
+++ b/eigrpd/eigrp_reply.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Eigrp Sending and Receiving EIGRP Reply Packets.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_routemap.c b/eigrpd/eigrp_routemap.c
index 218cea7fa..84f27d016 100644
--- a/eigrpd/eigrp_routemap.c
+++ b/eigrpd/eigrp_routemap.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Filter Functions.
  * Copyright (C) 2013-2015
@@ -18,22 +19,6 @@
  * in distribute command in EIGRP is matching destination IP (with both
  * access and prefix list).
  *
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_siaquery.c b/eigrpd/eigrp_siaquery.c
index 9c2a8c9d8..1c2ec3731 100644
--- a/eigrpd/eigrp_siaquery.c
+++ b/eigrpd/eigrp_siaquery.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Sending and Receiving EIGRP SIA-Query Packets.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_siareply.c b/eigrpd/eigrp_siareply.c
index 2d298c20b..37cca6737 100644
--- a/eigrpd/eigrp_siareply.c
+++ b/eigrpd/eigrp_siareply.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Sending and Receiving EIGRP SIA-Reply Packets.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/eigrpd/eigrp_snmp.c b/eigrpd/eigrp_snmp.c
index 5a930424c..f159415cc 100644
--- a/eigrpd/eigrp_snmp.c
+++ b/eigrpd/eigrp_snmp.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP SNMP Support.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_snmp.h b/eigrpd/eigrp_snmp.h
index 55114e605..3930b5c6b 100644
--- a/eigrpd/eigrp_snmp.h
+++ b/eigrpd/eigrp_snmp.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP SNMP Support.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/eigrpd/eigrp_structs.h b/eigrpd/eigrp_structs.h
index eb4a91cb6..9c88e34f6 100644
--- a/eigrpd/eigrp_structs.h
+++ b/eigrpd/eigrp_structs.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Definition of Data Structures.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_STRUCTS_H_
diff --git a/eigrpd/eigrp_topology.c b/eigrpd/eigrp_topology.c
index 846e21162..f17be8f4b 100644
--- a/eigrpd/eigrp_topology.c
+++ b/eigrpd/eigrp_topology.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Topology Table.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_topology.h b/eigrpd/eigrp_topology.h
index d7f79057a..426c290d9 100644
--- a/eigrpd/eigrp_topology.h
+++ b/eigrpd/eigrp_topology.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Topology Table.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_TOPOLOGY_H
diff --git a/eigrpd/eigrp_types.h b/eigrpd/eigrp_types.h
index bd6510733..f3ff99d95 100644
--- a/eigrpd/eigrp_types.h
+++ b/eigrpd/eigrp_types.h
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Definition of Data Types
  * Copyright (C) 2018
  * Authors:
  *   Donnie Savage
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_TYPES_H_
diff --git a/eigrpd/eigrp_update.c b/eigrpd/eigrp_update.c
index 5848632d8..49acf3069 100644
--- a/eigrpd/eigrp_update.c
+++ b/eigrpd/eigrp_update.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Sending and Receiving EIGRP Update Packets.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_vrf.c b/eigrpd/eigrp_vrf.c
index acf3e6978..645233ede 100644
--- a/eigrpd/eigrp_vrf.c
+++ b/eigrpd/eigrp_vrf.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * eigrp - vrf code
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/eigrpd/eigrp_vrf.h b/eigrpd/eigrp_vrf.h
index 423a4be55..146d864fe 100644
--- a/eigrpd/eigrp_vrf.h
+++ b/eigrpd/eigrp_vrf.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * eigrp - vrf code
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __EIGRP_VRF_H__
 
diff --git a/eigrpd/eigrp_vty.c b/eigrpd/eigrp_vty.c
index 137f9b028..33f728ec4 100644
--- a/eigrpd/eigrp_vty.c
+++ b/eigrpd/eigrp_vty.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP VTY Interface.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_vty.h b/eigrpd/eigrp_vty.h
index ebbf50385..fa07a785d 100644
--- a/eigrpd/eigrp_vty.h
+++ b/eigrpd/eigrp_vty.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP VTY Interface.
  * Copyright (C) 2013-2016
@@ -11,22 +12,6 @@
  *   Tomas Hvorkovy
  *   Martin Kontsek
  *   Lukas Koribsky
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_EIGRP_VTY_H
diff --git a/eigrpd/eigrp_yang.h b/eigrpd/eigrp_yang.h
index a95e5310f..b59f5f9fe 100644
--- a/eigrpd/eigrp_yang.h
+++ b/eigrpd/eigrp_yang.h
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP YANG Functions.
  * Copyright (C) 2019
  * Authors:
  *   Donnie Savage
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _EIGRP_YANG_H_
diff --git a/eigrpd/eigrp_zebra.c b/eigrpd/eigrp_zebra.c
index 89dd5be27..179c2d0f2 100644
--- a/eigrpd/eigrp_zebra.c
+++ b/eigrpd/eigrp_zebra.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra connect library for EIGRP.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrp_zebra.h b/eigrpd/eigrp_zebra.h
index 112f2584c..927d562ab 100644
--- a/eigrpd/eigrp_zebra.h
+++ b/eigrpd/eigrp_zebra.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra connect library for EIGRP.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRP_ZEBRA_H_
diff --git a/eigrpd/eigrpd.c b/eigrpd/eigrpd.c
index 0ec957481..a382862e3 100644
--- a/eigrpd/eigrpd.c
+++ b/eigrpd/eigrpd.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP Daemon Program.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/eigrpd/eigrpd.h b/eigrpd/eigrpd.h
index 949fe682c..6e5d5d13d 100644
--- a/eigrpd/eigrpd.h
+++ b/eigrpd/eigrpd.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * EIGRP main header.
  * Copyright (C) 2013-2014
@@ -7,22 +8,6 @@
  *   Matej Perina
  *   Peter Orsag
  *   Peter Paluch
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_EIGRPD_H
diff --git a/fpm/fpm.h b/fpm/fpm.h
index 0da8a5a8b..b08310f67 100644
--- a/fpm/fpm.h
+++ b/fpm/fpm.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC OR GPL-2.0-or-later
 /*
  * Public definitions pertaining to the Forwarding Plane Manager component.
  *
@@ -16,38 +17,7 @@
 
 /*
  * License Option 1: GPL
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
- */
-
-/*
  * License Option 2: ISC License
- *
- * Permission to use, copy, modify, and/or distribute this software
- * for any purpose with or without fee is hereby granted, provided
- * that the above copyright notice and this permission notice appear
- * in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
- * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
- * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
- * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
- * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
- * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FPM_H
diff --git a/fpm/fpm.proto b/fpm/fpm.proto
index 4597c7f8e..9f0917fea 100644
--- a/fpm/fpm.proto
+++ b/fpm/fpm.proto
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 //
 // fpm.proto
 //
diff --git a/fpm/fpm_pb.c b/fpm/fpm_pb.c
index 5cd03a4d5..e4c9395a8 100644
--- a/fpm/fpm_pb.c
+++ b/fpm/fpm_pb.c
@@ -1,25 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * fpm_pb.c
  *
  * @copyright Copyright (C) 2016 Sproute Networks, Inc.
  *
  * @author Avneesh Sachdev <avneesh@sproute.com>
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/fpm/fpm_pb.h b/fpm/fpm_pb.h
index 659b5a64a..7e39054d1 100644
--- a/fpm/fpm_pb.h
+++ b/fpm/fpm_pb.h
@@ -1,25 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * fpm_pb.h
  *
  * @copyright Copyright (C) 2016 Sproute Networks, Inc.
  *
  * @author Avneesh Sachdev <avneesh@sproute.com>
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/grpc/frr-northbound.proto b/grpc/frr-northbound.proto
index 32544ba69..b3b1dc465 100644
--- a/grpc/frr-northbound.proto
+++ b/grpc/frr-northbound.proto
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 //
 // Copyright 2019 FRRouting
 //
diff --git a/include/linux/seg6_local.h b/include/linux/seg6_local.h
index ab724498a..6788b5879 100644
--- a/include/linux/seg6_local.h
+++ b/include/linux/seg6_local.h
@@ -1,14 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  SR-IPv6 implementation
  *
  *  Author:
  *  David Lebrun <david.lebrun@uclouvain.be>
- *
- *
- *  This program is free software; you can redistribute it and/or
- *      modify it under the terms of the GNU General Public License
- *      as published by the Free Software Foundation; either version
- *      2 of the License, or (at your option) any later version.
  */
 
 #ifndef _LINUX_SEG6_LOCAL_H
diff --git a/isisd/fabricd.c b/isisd/fabricd.c
index be035b623..64734f862 100644
--- a/isisd/fabricd.c
+++ b/isisd/fabricd.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - OpenFabric extensions
  *
  * Copyright (C) 2018 Christian Franke
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include "isisd/fabricd.h"
diff --git a/isisd/fabricd.h b/isisd/fabricd.h
index 9455cdb0f..c1df0ad28 100644
--- a/isisd/fabricd.h
+++ b/isisd/fabricd.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - OpenFabric extensions
  *
  * Copyright (C) 2018 Christian Franke
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef FABRICD_H
 #define FABRICD_H
diff --git a/isisd/isis_adjacency.c b/isisd/isis_adjacency.c
index a88789740..cb2cf8f61 100644
--- a/isisd/isis_adjacency.c
+++ b/isisd/isis_adjacency.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_adjacency.c
  *                             handling of IS-IS adjacencies
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_adjacency.h b/isisd/isis_adjacency.h
index 49adc89ae..c260ce78d 100644
--- a/isisd/isis_adjacency.h
+++ b/isisd/isis_adjacency.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_adjacency.h
  *                             IS-IS adjacency handling
@@ -6,20 +7,6 @@
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
  *
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ISIS_ADJACENCY_H
diff --git a/isisd/isis_bfd.c b/isisd/isis_bfd.c
index 1877c831f..b973dd493 100644
--- a/isisd/isis_bfd.c
+++ b/isisd/isis_bfd.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - BFD support
  * Copyright (C) 2018 Christian Franke
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/isisd/isis_bfd.h b/isisd/isis_bfd.h
index 1dec7ae20..30248ccec 100644
--- a/isisd/isis_bfd.h
+++ b/isisd/isis_bfd.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - BFD support
  * Copyright (C) 2018 Christian Franke
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef ISIS_BFD_H
 #define ISIS_BFD_H
diff --git a/isisd/isis_bpf.c b/isisd/isis_bpf.c
index 11f43279e..96d629124 100644
--- a/isisd/isis_bpf.c
+++ b/isisd/isis_bpf.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_bpf.c
  *
  * Copyright (C) 2001,2002    Sampo Saaristo
  *                            Tampere University of Technology
  *                            Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_circuit.c b/isisd/isis_circuit.c
index fa0f2c998..dd5f921be 100644
--- a/isisd/isis_circuit.c
+++ b/isisd/isis_circuit.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_circuit.h
  *
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #ifdef GNU_LINUX
diff --git a/isisd/isis_circuit.h b/isisd/isis_circuit.h
index b3ad3f7ff..494e96b69 100644
--- a/isisd/isis_circuit.h
+++ b/isisd/isis_circuit.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_circuit.h
  *
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef ISIS_CIRCUIT_H
diff --git a/isisd/isis_cli.c b/isisd/isis_cli.c
index cb607deb2..26ae2024b 100644
--- a/isisd/isis_cli.c
+++ b/isisd/isis_cli.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
  * Copyright (C) 2018        Volta Networks
  *                           Emanuele Di Pascale
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_common.h b/isisd/isis_common.h
index 809a3980d..c908dc2e2 100644
--- a/isisd/isis_common.h
+++ b/isisd/isis_common.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_common.h
  *                             some common data structures
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef ISIS_COMMON_H
diff --git a/isisd/isis_constants.h b/isisd/isis_constants.h
index 3d6a20ee6..b2be28229 100644
--- a/isisd/isis_constants.h
+++ b/isisd/isis_constants.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_constants.h
  *
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef ISIS_CONSTANTS_H
diff --git a/isisd/isis_csm.c b/isisd/isis_csm.c
index 0a29dcd09..95bbc077a 100644
--- a/isisd/isis_csm.c
+++ b/isisd/isis_csm.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_csm.c
  *                             IS-IS circuit state machine
  * Copyright (C) 2001,2002    Sampo Saaristo
  *                            Tampere University of Technology
  *                            Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_csm.h b/isisd/isis_csm.h
index ad72ff511..80e02b82e 100644
--- a/isisd/isis_csm.h
+++ b/isisd/isis_csm.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_csm.h
  *                             IS-IS circuit state machine
@@ -6,20 +7,6 @@
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
  *
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _ZEBRA_ISIS_CSM_H
 #define _ZEBRA_ISIS_CSM_H
diff --git a/isisd/isis_dlpi.c b/isisd/isis_dlpi.c
index f6ea0aea6..1f091524b 100644
--- a/isisd/isis_dlpi.c
+++ b/isisd/isis_dlpi.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_dlpi.c
  *
  * Copyright (C) 2001,2002    Sampo Saaristo
  *                            Tampere University of Technology
  *                            Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_dr.c b/isisd/isis_dr.c
index 400982f2f..b1a421581 100644
--- a/isisd/isis_dr.c
+++ b/isisd/isis_dr.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_dr.c
  *                             IS-IS designated router related routines
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/isisd/isis_dr.h b/isisd/isis_dr.h
index f01a03f37..2b9bf60ff 100644
--- a/isisd/isis_dr.h
+++ b/isisd/isis_dr.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_dr.h
  *                             IS-IS designated router related routines
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ISIS_DR_H
diff --git a/isisd/isis_dynhn.c b/isisd/isis_dynhn.c
index 5d6b7bc60..ef21de327 100644
--- a/isisd/isis_dynhn.c
+++ b/isisd/isis_dynhn.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_dynhn.c
  *                             Dynamic hostname cache
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_dynhn.h b/isisd/isis_dynhn.h
index afb8b51b1..d4deb5572 100644
--- a/isisd/isis_dynhn.h
+++ b/isisd/isis_dynhn.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_dynhn.h
  *                             Dynamic hostname cache
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _ZEBRA_ISIS_DYNHN_H
 #define _ZEBRA_ISIS_DYNHN_H
diff --git a/isisd/isis_errors.c b/isisd/isis_errors.c
index 1d277ac5f..0bdff1981 100644
--- a/isisd/isis_errors.c
+++ b/isisd/isis_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ISIS-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_errors.h b/isisd/isis_errors.h
index 6f3e5f85c..9a21c79f4 100644
--- a/isisd/isis_errors.h
+++ b/isisd/isis_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ISIS-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __ISIS_ERRORS_H__
diff --git a/isisd/isis_events.c b/isisd/isis_events.c
index 42823cf2b..d7b396911 100644
--- a/isisd/isis_events.c
+++ b/isisd/isis_events.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_events.h
  *
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/isisd/isis_events.h b/isisd/isis_events.h
index e6d9af58b..e827f75a8 100644
--- a/isisd/isis_events.h
+++ b/isisd/isis_events.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_events.h
  *
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _ZEBRA_ISIS_EVENTS_H
 #define _ZEBRA_ISIS_EVENTS_H
diff --git a/isisd/isis_flags.c b/isisd/isis_flags.c
index b1ece94e8..a621b4b5e 100644
--- a/isisd/isis_flags.c
+++ b/isisd/isis_flags.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_flags.c
  *                             Routines for manipulation of SSN and SRM flags
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_flags.h b/isisd/isis_flags.h
index b3449e1e5..47a135659 100644
--- a/isisd/isis_flags.h
+++ b/isisd/isis_flags.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_flags.h
  *                             Routines for manipulation of SSN and SRM flags
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ISIS_FLAGS_H
diff --git a/isisd/isis_ldp_sync.c b/isisd/isis_ldp_sync.c
index 3568543b4..817e2a201 100644
--- a/isisd/isis_ldp_sync.c
+++ b/isisd/isis_ldp_sync.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * isis_ldp_sync.c: ISIS LDP-IGP Sync  handling routines
  * Copyright (C) 2020 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_ldp_sync.h b/isisd/isis_ldp_sync.h
index 69a180000..d593ed355 100644
--- a/isisd/isis_ldp_sync.h
+++ b/isisd/isis_ldp_sync.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * isis_ldp_sync.h: ISIS LDP-IGP Sync  handling routines
  * Copyright (C) 2020 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ISIS_LDP_SYNC_H
diff --git a/isisd/isis_lfa.c b/isisd/isis_lfa.c
index 2ec6dafd3..599dca129 100644
--- a/isisd/isis_lfa.c
+++ b/isisd/isis_lfa.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_lfa.h b/isisd/isis_lfa.h
index 9db03a3a1..0ba1c1cef 100644
--- a/isisd/isis_lfa.h
+++ b/isisd/isis_lfa.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_ISIS_LFA_H
diff --git a/isisd/isis_lsp.c b/isisd/isis_lsp.c
index 63b4edb1e..8c347ef81 100644
--- a/isisd/isis_lsp.c
+++ b/isisd/isis_lsp.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_lsp.c
  *                             LSP processing
@@ -6,20 +7,6 @@
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
  * Copyright (C) 2013-2015   Christian Franke <chris@opensourcerouting.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_lsp.h b/isisd/isis_lsp.h
index d7762324d..5bb2b949c 100644
--- a/isisd/isis_lsp.h
+++ b/isisd/isis_lsp.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_lsp.h
  *                             LSP processing
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ISIS_LSP_H
diff --git a/isisd/isis_main.c b/isisd/isis_main.c
index 607661b54..9b2bebb42 100644
--- a/isisd/isis_main.c
+++ b/isisd/isis_main.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_main.c
  *
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_misc.c b/isisd/isis_misc.c
index d49ad8485..4a490ab5a 100644
--- a/isisd/isis_misc.c
+++ b/isisd/isis_misc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_misc.h
  *                             Miscellanous routines
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_misc.h b/isisd/isis_misc.h
index 5cdbbfb05..b8b4ebd28 100644
--- a/isisd/isis_misc.h
+++ b/isisd/isis_misc.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_misc.h
  *                             Miscellanous routines
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ISIS_MISC_H
diff --git a/isisd/isis_mt.c b/isisd/isis_mt.c
index 6bbb01c30..fcc0f5381 100644
--- a/isisd/isis_mt.c
+++ b/isisd/isis_mt.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - Multi Topology Support
  *
  * Copyright (C) 2017 Christian Franke
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include "isisd/isisd.h"
diff --git a/isisd/isis_mt.h b/isisd/isis_mt.h
index 13e508451..9b0df9bb7 100644
--- a/isisd/isis_mt.h
+++ b/isisd/isis_mt.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - Multi Topology Support
  *
  * Copyright (C) 2017 Christian Franke
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef ISIS_MT_H
 #define ISIS_MT_H
diff --git a/isisd/isis_nb.c b/isisd/isis_nb.c
index c5653d034..bcda5bd6a 100644
--- a/isisd/isis_nb.c
+++ b/isisd/isis_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018        Volta Networks
  *                           Emanuele Di Pascale
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_nb.h b/isisd/isis_nb.h
index 380ce4f25..1a2bd2deb 100644
--- a/isisd/isis_nb.h
+++ b/isisd/isis_nb.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018        Volta Networks
  *                           Emanuele Di Pascale
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef ISISD_ISIS_NB_H_
diff --git a/isisd/isis_nb_config.c b/isisd/isis_nb_config.c
index 1b7663fcf..a7c4e4f36 100644
--- a/isisd/isis_nb_config.c
+++ b/isisd/isis_nb_config.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
  * Copyright (C) 2018        Volta Networks
  *                           Emanuele Di Pascale
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_nb_notifications.c b/isisd/isis_nb_notifications.c
index fd7b1b315..94b1c47d3 100644
--- a/isisd/isis_nb_notifications.c
+++ b/isisd/isis_nb_notifications.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018        Volta Networks
  *                           Emanuele Di Pascale
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_nb_state.c b/isisd/isis_nb_state.c
index 5b1fc6e1d..13fdddf55 100644
--- a/isisd/isis_nb_state.c
+++ b/isisd/isis_nb_state.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018        Volta Networks
  *                           Emanuele Di Pascale
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_network.h b/isisd/isis_network.h
index cc8605d2e..31cad32a5 100644
--- a/isisd/isis_network.h
+++ b/isisd/isis_network.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_network.h
  *
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/isisd/isis_pdu.c b/isisd/isis_pdu.c
index 47093fdd6..70ec2426d 100644
--- a/isisd/isis_pdu.c
+++ b/isisd/isis_pdu.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_pdu.c
  *                             PDU processing
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_pdu.h b/isisd/isis_pdu.h
index b4018995d..512439400 100644
--- a/isisd/isis_pdu.h
+++ b/isisd/isis_pdu.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_pdu.h
  *                             PDU processing
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ISIS_PDU_H
diff --git a/isisd/isis_pdu_counter.c b/isisd/isis_pdu_counter.c
index bc1a57ccf..9d07b5e59 100644
--- a/isisd/isis_pdu_counter.c
+++ b/isisd/isis_pdu_counter.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Routing protocol - isis_pdu_counter.c
  * Copyright (C) 2018 Christian Franke, for NetDEF Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_pdu_counter.h b/isisd/isis_pdu_counter.h
index 7f07adf5c..c53c47368 100644
--- a/isisd/isis_pdu_counter.h
+++ b/isisd/isis_pdu_counter.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Routing protocol - isis_pdu_counter.c
  * Copyright (C) 2018 Christian Franke, for NetDEF Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef ISIS_PDU_COUNTER_H
 #define ISIS_PDU_COUNTER_H
diff --git a/isisd/isis_pfpacket.c b/isisd/isis_pfpacket.c
index 84278f3f7..4f8ea4a5e 100644
--- a/isisd/isis_pfpacket.c
+++ b/isisd/isis_pfpacket.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_pfpacket.c
  *
  * Copyright (C) 2001,2002    Sampo Saaristo
  *                            Tampere University of Technology
  *                            Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_redist.c b/isisd/isis_redist.c
index dd82c5057..6a822f02f 100644
--- a/isisd/isis_redist.c
+++ b/isisd/isis_redist.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_redist.c
  *
  * Copyright (C) 2013-2015 Christian Franke <chris@opensourcerouting.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_redist.h b/isisd/isis_redist.h
index 10dccbc51..ae5ec2b3b 100644
--- a/isisd/isis_redist.h
+++ b/isisd/isis_redist.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_redist.h
  *
  * Copyright (C) 2013-2015 Christian Franke <chris@opensourcerouting.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef ISIS_REDIST_H
diff --git a/isisd/isis_route.c b/isisd/isis_route.c
index c7dc9b7c4..711d5cbed 100644
--- a/isisd/isis_route.c
+++ b/isisd/isis_route.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol               - isis_route.c
  * Copyright (C) 2001,2002   Sampo Saaristo
@@ -6,20 +7,6 @@
  *
  *                                         based on ../ospf6d/ospf6_route.[ch]
  *                                         by Yasuhiro Ohara
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_route.h b/isisd/isis_route.h
index a0e0500ae..40e746289 100644
--- a/isisd/isis_route.h
+++ b/isisd/isis_route.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol               - isis_route.h
  *
@@ -7,20 +8,6 @@
  *
  *                                         based on ../ospf6d/ospf6_route.[ch]
  *                                         by Yasuhiro Ohara
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _ZEBRA_ISIS_ROUTE_H
 #define _ZEBRA_ISIS_ROUTE_H
diff --git a/isisd/isis_routemap.c b/isisd/isis_routemap.c
index 626e399e1..632b4ff95 100644
--- a/isisd/isis_routemap.c
+++ b/isisd/isis_routemap.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_routemap.c
  *
  * Copyright (C) 2013-2015 Christian Franke <chris@opensourcerouting.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_routemap.h b/isisd/isis_routemap.h
index f1577666b..758043f81 100644
--- a/isisd/isis_routemap.h
+++ b/isisd/isis_routemap.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_routemap.h
  *
  * Copyright (C) 2013-2015 Christian Franke <chris@opensourcerouting.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef ISIS_ROUTEMAP_H
 #define ISIS_ROUTEMAP_H
diff --git a/isisd/isis_snmp.c b/isisd/isis_snmp.c
index a184b5b30..ae570a086 100644
--- a/isisd/isis_snmp.c
+++ b/isisd/isis_snmp.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ISIS SNMP support
  * Copyright (C) 2020 Volta Networks, Inc.
  *                    Aleksey Romanov
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/isisd/isis_spf.c b/isisd/isis_spf.c
index 215108a28..e1aec683d 100644
--- a/isisd/isis_spf.c
+++ b/isisd/isis_spf.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol                  - isis_spf.c
  *                                              The SPT algorithm
@@ -6,20 +7,6 @@
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
  * Copyright (C) 2017        Christian Franke <chris@opensourcerouting.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_spf.h b/isisd/isis_spf.h
index 3fa5182ba..7f4ab707e 100644
--- a/isisd/isis_spf.h
+++ b/isisd/isis_spf.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_spf.h
  *                             IS-IS Shortest Path First algorithm
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ISIS_SPF_H
diff --git a/isisd/isis_spf_private.h b/isisd/isis_spf_private.h
index 07d4ff5a0..d82937270 100644
--- a/isisd/isis_spf_private.h
+++ b/isisd/isis_spf_private.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol                  - isis_spf_private.h
  *
@@ -5,20 +6,6 @@
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
  * Copyright (C) 2017        Christian Franke <chris@opensourcerouting.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef ISIS_SPF_PRIVATE_H
 #define ISIS_SPF_PRIVATE_H
diff --git a/isisd/isis_sr.c b/isisd/isis_sr.c
index 707bd162f..429399165 100644
--- a/isisd/isis_sr.c
+++ b/isisd/isis_sr.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of Segment Routing for IS-IS as per RFC 8667
  *
@@ -5,20 +6,6 @@
  *
  * Author: Olivier Dugeon <olivier.dugeon@orange.com>
  * Contributor: Renato Westphal <renato@opensourcerouting.org> for NetDEF
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_sr.h b/isisd/isis_sr.h
index a933f366e..627f1fb74 100644
--- a/isisd/isis_sr.h
+++ b/isisd/isis_sr.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of Segment Routing for IS-IS as per RFC 8667
  *
@@ -5,20 +6,6 @@
  *
  * Author: Olivier Dugeon <olivier.dugeon@orange.com>
  * Contributor: Renato Westphal <renato@opensourcerouting.org> for NetDEF
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_ISIS_SR_H
diff --git a/isisd/isis_te.c b/isisd/isis_te.c
index cf23c1a5a..3659f4e07 100644
--- a/isisd/isis_te.c
+++ b/isisd/isis_te.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_te.c
  *
@@ -6,22 +7,6 @@
  * Author: Olivier Dugeon <olivier.dugeon@orange.com>
  *
  * Copyright (C) 2014 - 2019 Orange Labs http://www.orange.com
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_te.h b/isisd/isis_te.h
index 03525962f..5087cdac4 100644
--- a/isisd/isis_te.h
+++ b/isisd/isis_te.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_te.c
  *
@@ -6,22 +7,6 @@
  * Author: Olivier Dugeon <olivier.dugeon@orange.com>
  *
  * Copyright (C) 2014 - 2019 Orange Labs http://www.orange.com
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ISIS_MPLS_TE_H
diff --git a/isisd/isis_tlvs.c b/isisd/isis_tlvs.c
index 8ece697b7..b52a38be7 100644
--- a/isisd/isis_tlvs.c
+++ b/isisd/isis_tlvs.c
@@ -1,26 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS TLV Serializer/Deserializer
  *
  * Copyright (C) 2015,2017 Christian Franke
  *
  * Copyright (C) 2019 Olivier Dugeon - Orange Labs (for TE and SR)
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_tlvs.h b/isisd/isis_tlvs.h
index 1dad9b187..51058f1af 100644
--- a/isisd/isis_tlvs.h
+++ b/isisd/isis_tlvs.h
@@ -1,26 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS TLV Serializer/Deserializer
  *
  * Copyright (C) 2015,2017 Christian Franke
 
  * Copyright (C) 2019 Olivier Dugeon - Orange Labs (for TE and SR)
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #ifndef ISIS_TLVS_H
 #define ISIS_TLVS_H
diff --git a/isisd/isis_tx_queue.c b/isisd/isis_tx_queue.c
index 06369c6d7..ad9105976 100644
--- a/isisd/isis_tx_queue.c
+++ b/isisd/isis_tx_queue.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - LSP TX Queuing logic
  *
  * Copyright (C) 2018 Christian Franke
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/isisd/isis_tx_queue.h b/isisd/isis_tx_queue.h
index f0f1184d5..c3e36d04a 100644
--- a/isisd/isis_tx_queue.h
+++ b/isisd/isis_tx_queue.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - LSP TX Queuing logic
  *
  * Copyright (C) 2018 Christian Franke
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef ISIS_TX_QUEUE_H
 #define ISIS_TX_QUEUE_H
diff --git a/isisd/isis_vty_fabricd.c b/isisd/isis_vty_fabricd.c
index 2c1b6e932..0d25f6610 100644
--- a/isisd/isis_vty_fabricd.c
+++ b/isisd/isis_vty_fabricd.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_vty_fabricd.c
  *
  * This file contains the CLI that is specific to OpenFabric
  *
  * Copyright (C) 2018        Christian Franke, for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/isisd/isis_zebra.c b/isisd/isis_zebra.c
index 52a5cdd64..7e85576c7 100644
--- a/isisd/isis_zebra.c
+++ b/isisd/isis_zebra.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_zebra.c
  *
@@ -5,20 +6,6 @@
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
  * Copyright (C) 2013-2015   Christian Franke <chris@opensourcerouting.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isis_zebra.h b/isisd/isis_zebra.h
index 84dc58ec6..f34088f98 100644
--- a/isisd/isis_zebra.h
+++ b/isisd/isis_zebra.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isis_zebra.h
  *
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _ZEBRA_ISIS_ZEBRA_H
 #define _ZEBRA_ISIS_ZEBRA_H
diff --git a/isisd/isisd.c b/isisd/isisd.c
index 7e40c21a0..d9f8a262c 100644
--- a/isisd/isisd.c
+++ b/isisd/isisd.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isisd.c
  *
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/isisd.h b/isisd/isisd.h
index 38f20b211..2052e8e3d 100644
--- a/isisd/isisd.h
+++ b/isisd/isisd.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - isisd.h
  *
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef ISISD_H
diff --git a/isisd/iso_checksum.c b/isisd/iso_checksum.c
index 0da6d5fc8..f12c19577 100644
--- a/isisd/iso_checksum.c
+++ b/isisd/iso_checksum.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - iso_checksum.c
  *                             ISO checksum related routines
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/isisd/iso_checksum.h b/isisd/iso_checksum.h
index 357c75fa5..9dcb039bf 100644
--- a/isisd/iso_checksum.h
+++ b/isisd/iso_checksum.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IS-IS Rout(e)ing protocol - iso_checksum.c
  *                             ISO checksum related routines
@@ -5,20 +6,6 @@
  * Copyright (C) 2001,2002   Sampo Saaristo
  *                           Tampere University of Technology
  *                           Institute of Communications Engineering
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public Licenseas published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _ZEBRA_ISO_CSUM_H
 #define _ZEBRA_ISO_CSUM_H
diff --git a/ldpd/accept.c b/ldpd/accept.c
index 1a04c563c..170c079b5 100644
--- a/ldpd/accept.c
+++ b/ldpd/accept.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2012 Claudio Jeker <claudio@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/address.c b/ldpd/address.c
index c3e27357b..45d1bb14b 100644
--- a/ldpd/address.c
+++ b/ldpd/address.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/adjacency.c b/ldpd/adjacency.c
index 8caa3c4e2..97e4c2ef0 100644
--- a/ldpd/adjacency.c
+++ b/ldpd/adjacency.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
@@ -5,18 +6,6 @@
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
  * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
  * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/control.c b/ldpd/control.c
index 09e91217a..b1260feb6 100644
--- a/ldpd/control.c
+++ b/ldpd/control.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/control.h b/ldpd/control.h
index 23edb5f24..f45c97e8b 100644
--- a/ldpd/control.h
+++ b/ldpd/control.h
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _CONTROL_H_
diff --git a/ldpd/hello.c b/ldpd/hello.c
index 629fe46e7..83c0b2f8c 100644
--- a/ldpd/hello.c
+++ b/ldpd/hello.c
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/init.c b/ldpd/init.c
index 0ee64c16f..15d653b74 100644
--- a/ldpd/init.c
+++ b/ldpd/init.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/interface.c b/ldpd/interface.c
index 392e25470..5d1859298 100644
--- a/ldpd/interface.c
+++ b/ldpd/interface.c
@@ -1,21 +1,10 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
  * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
  * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/keepalive.c b/ldpd/keepalive.c
index b03127109..7a71989d0 100644
--- a/ldpd/keepalive.c
+++ b/ldpd/keepalive.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/l2vpn.c b/ldpd/l2vpn.c
index 2c68f3edb..4664b1f89 100644
--- a/ldpd/l2vpn.c
+++ b/ldpd/l2vpn.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
@@ -5,18 +6,6 @@
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
  * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
  * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/labelmapping.c b/ldpd/labelmapping.c
index 13d324312..dcaf1cc10 100644
--- a/ldpd/labelmapping.c
+++ b/ldpd/labelmapping.c
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2014, 2015 Renato Westphal <renato@openbsd.org>
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/lde.c b/ldpd/lde.c
index 66398ae41..edd13fed3 100644
--- a/ldpd/lde.c
+++ b/ldpd/lde.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
@@ -5,18 +6,6 @@
  * Copyright (c) 2004, 2005 Claudio Jeker <claudio@openbsd.org>
  * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/lde.h b/ldpd/lde.h
index bcb1e1cca..3a64f0d3b 100644
--- a/ldpd/lde.h
+++ b/ldpd/lde.h
@@ -1,21 +1,10 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _LDE_H_
diff --git a/ldpd/lde_lib.c b/ldpd/lde_lib.c
index 5d173c40c..d737e9f41 100644
--- a/ldpd/lde_lib.c
+++ b/ldpd/lde_lib.c
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/ldp.h b/ldpd/ldp.h
index 4bad3afc3..33cf93cb2 100644
--- a/ldpd/ldp.h
+++ b/ldpd/ldp.h
@@ -1,21 +1,10 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
  * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 /* LDP protocol definitions */
diff --git a/ldpd/ldp_debug.c b/ldpd/ldp_debug.c
index a8d9833dd..d2aeaba8b 100644
--- a/ldpd/ldp_debug.c
+++ b/ldpd/ldp_debug.c
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016 by Open Source Routing.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ldpd/ldp_debug.h b/ldpd/ldp_debug.h
index 977734bdd..09fa71169 100644
--- a/ldpd/ldp_debug.h
+++ b/ldpd/ldp_debug.h
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016 by Open Source Routing.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #ifndef _LDP_DEBUG_H_
diff --git a/ldpd/ldp_snmp.c b/ldpd/ldp_snmp.c
index dfc7d145f..9a26a8d17 100644
--- a/ldpd/ldp_snmp.c
+++ b/ldpd/ldp_snmp.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * LDP SNMP support
  * Copyright (C) 2020 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/ldpd/ldp_vty.h b/ldpd/ldp_vty.h
index d788fa068..5c83d1c56 100644
--- a/ldpd/ldp_vty.h
+++ b/ldpd/ldp_vty.h
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016 by Open Source Routing.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #ifndef _LDP_VTY_H_
diff --git a/ldpd/ldp_vty_cmds.c b/ldpd/ldp_vty_cmds.c
index 33e6b297c..e046ae996 100644
--- a/ldpd/ldp_vty_cmds.c
+++ b/ldpd/ldp_vty_cmds.c
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016 by Open Source Routing.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ldpd/ldp_vty_conf.c b/ldpd/ldp_vty_conf.c
index fbd718bb0..ffff67683 100644
--- a/ldpd/ldp_vty_conf.c
+++ b/ldpd/ldp_vty_conf.c
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016 by Open Source Routing.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ldpd/ldp_vty_exec.c b/ldpd/ldp_vty_exec.c
index a8cffd6d9..b181e33a5 100644
--- a/ldpd/ldp_vty_exec.c
+++ b/ldpd/ldp_vty_exec.c
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016 by Open Source Routing.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ldpd/ldp_zebra.c b/ldpd/ldp_zebra.c
index 833545cf5..6f0f990e4 100644
--- a/ldpd/ldp_zebra.c
+++ b/ldpd/ldp_zebra.c
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016 by Open Source Routing.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ldpd/ldpd.c b/ldpd/ldpd.c
index 87d78afa2..fe97c5483 100644
--- a/ldpd/ldpd.c
+++ b/ldpd/ldpd.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
@@ -5,18 +6,6 @@
  * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
  * Copyright (c) 2004, 2008 Esben Norby <norby@openbsd.org>
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/ldpd.h b/ldpd/ldpd.h
index 02eaf10eb..dc993e3d7 100644
--- a/ldpd/ldpd.h
+++ b/ldpd/ldpd.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
@@ -5,18 +6,6 @@
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
  * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _LDPD_H_
diff --git a/ldpd/ldpe.c b/ldpd/ldpe.c
index 35d2bf21c..f53dc7254 100644
--- a/ldpd/ldpe.c
+++ b/ldpd/ldpe.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
@@ -5,18 +6,6 @@
  * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
  * Copyright (c) 2004, 2008 Esben Norby <norby@openbsd.org>
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/ldpe.h b/ldpd/ldpe.h
index ddb0e0d97..e799538b6 100644
--- a/ldpd/ldpe.h
+++ b/ldpd/ldpe.h
@@ -1,21 +1,10 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
  * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _LDPE_H_
diff --git a/ldpd/log.c b/ldpd/log.c
index 88ce03095..a9898a64f 100644
--- a/ldpd/log.c
+++ b/ldpd/log.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/log.h b/ldpd/log.h
index 8c236ff5f..641ad8ac5 100644
--- a/ldpd/log.h
+++ b/ldpd/log.h
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef LOG_H
diff --git a/ldpd/logmsg.c b/ldpd/logmsg.c
index e16006b89..4f1d950bb 100644
--- a/ldpd/logmsg.c
+++ b/ldpd/logmsg.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/neighbor.c b/ldpd/neighbor.c
index 6d6c7d00c..831f2a6ab 100644
--- a/ldpd/neighbor.c
+++ b/ldpd/neighbor.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
@@ -5,18 +6,6 @@
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
  * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
  * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/notification.c b/ldpd/notification.c
index 3ecf5d4ba..af5bb267d 100644
--- a/ldpd/notification.c
+++ b/ldpd/notification.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/packet.c b/ldpd/packet.c
index 2cca52461..a253ef466 100644
--- a/ldpd/packet.c
+++ b/ldpd/packet.c
@@ -1,21 +1,10 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
  * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/pfkey.c b/ldpd/pfkey.c
index 3bd3cc729..4bea2e190 100644
--- a/ldpd/pfkey.c
+++ b/ldpd/pfkey.c
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
  * Copyright (c) 2003, 2004 Markus Friedl <markus@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/ldpd/rlfa.c b/ldpd/rlfa.c
index 697ec08af..d898a1308 100644
--- a/ldpd/rlfa.c
+++ b/ldpd/rlfa.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ldpd/rlfa.h b/ldpd/rlfa.h
index fe67917e8..408374277 100644
--- a/ldpd/rlfa.h
+++ b/ldpd/rlfa.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _LDPD_RLFA_H_
diff --git a/ldpd/socket.c b/ldpd/socket.c
index e865707d4..ec6d8be3d 100644
--- a/ldpd/socket.c
+++ b/ldpd/socket.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
@@ -5,18 +6,6 @@
  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
  * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/ldpd/util.c b/ldpd/util.c
index 019d846ad..85ba25c77 100644
--- a/ldpd/util.c
+++ b/ldpd/util.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$ */
 
 /*
@@ -5,18 +6,6 @@
  * Copyright (c) 2012 Alexander Bluhm <bluhm@openbsd.org>
  * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/lib/agentx.c b/lib/agentx.c
index 5f6245980..2f45ae833 100644
--- a/lib/agentx.c
+++ b/lib/agentx.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* SNMP support
  * Copyright (C) 2012 Vincent Bernat <bernat@luffy.cx>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/agg_table.c b/lib/agg_table.c
index 22b981e28..9cf277fcf 100644
--- a/lib/agg_table.c
+++ b/lib/agg_table.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Aggregate Route
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "zebra.h"
 
diff --git a/lib/agg_table.h b/lib/agg_table.h
index e0c06449e..af1e6b6af 100644
--- a/lib/agg_table.h
+++ b/lib/agg_table.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * agg_table - Aggregate Table Header
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __AGG_TABLE_H__
 #define __AGG_TABLE_H__
diff --git a/lib/assert/assert.h b/lib/assert/assert.h
index fbdbd52ce..97c746007 100644
--- a/lib/assert/assert.h
+++ b/lib/assert/assert.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2021  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 /* WARNING: this file is "special" in that it overrides the system-provided
diff --git a/lib/atomlist.c b/lib/atomlist.c
index 2631d4fa7..5c361d3da 100644
--- a/lib/atomlist.c
+++ b/lib/atomlist.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2016-2018  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/atomlist.h b/lib/atomlist.h
index b0c4da4ba..2b6a3a176 100644
--- a/lib/atomlist.h
+++ b/lib/atomlist.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2016-2019  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_ATOMLIST_H
diff --git a/lib/base64.c b/lib/base64.c
index 6f0be039f..1507b0252 100644
--- a/lib/base64.c
+++ b/lib/base64.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: NONE
 /*
  * This is part of the libb64 project, and has been placed in the public domain.
  * For details, see http://sourceforge.net/projects/libb64
diff --git a/lib/base64.h b/lib/base64.h
index 3dc1559aa..839f92aa7 100644
--- a/lib/base64.h
+++ b/lib/base64.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: NONE
 /*
  * This is part of the libb64 project, and has been placed in the public domain.
  * For details, see http://sourceforge.net/projects/libb64
diff --git a/lib/bfd.c b/lib/bfd.c
index 9078e3559..0d77c5c82 100644
--- a/lib/bfd.c
+++ b/lib/bfd.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * bfd.c: BFD handling routines
  *
  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/bfd.h b/lib/bfd.h
index 51e831785..66c08cde7 100644
--- a/lib/bfd.h
+++ b/lib/bfd.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * bfd.h: BFD definitions and structures
  *
  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_BFD_H
diff --git a/lib/bitfield.h b/lib/bitfield.h
index 79f6f205c..c4e2cbe4e 100644
--- a/lib/bitfield.h
+++ b/lib/bitfield.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Bitfields
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 /**
  * A simple bit array implementation to allocate and free IDs. An example
diff --git a/lib/buffer.c b/lib/buffer.c
index e976fecc1..63df56a6d 100644
--- a/lib/buffer.c
+++ b/lib/buffer.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Buffering of output and input.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/buffer.h b/lib/buffer.h
index 8b5a89825..5d98c31db 100644
--- a/lib/buffer.h
+++ b/lib/buffer.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Buffering to output and input.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_BUFFER_H
diff --git a/lib/clippy.c b/lib/clippy.c
index 1c27f857b..c3c9f5c40 100644
--- a/lib/clippy.c
+++ b/lib/clippy.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * clippy (CLI preparator in python) main executable
  * Copyright (C) 2016-2017  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "config.h"
diff --git a/lib/clippy.h b/lib/clippy.h
index 95af27410..d6aa642e8 100644
--- a/lib/clippy.h
+++ b/lib/clippy.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * clippy (CLI preparator in python)
  * Copyright (C) 2016-2017  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_CLIPPY_H
diff --git a/lib/command.c b/lib/command.c
index c8f150edf..cf96df6f9 100644
--- a/lib/command.c
+++ b/lib/command.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * CLI backend interface.
  *
@@ -6,22 +7,6 @@
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
  * Copyright (C) 2013 by Open Source Routing.
  * Copyright (C) 2013 by Internet Systems Consortium, Inc. ("ISC")
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/command.h b/lib/command.h
index 28bb96e0e..2121bfd62 100644
--- a/lib/command.h
+++ b/lib/command.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra configuration command interface routine
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_COMMAND_H
diff --git a/lib/command_graph.c b/lib/command_graph.c
index 766d7e937..850fdeafc 100644
--- a/lib/command_graph.c
+++ b/lib/command_graph.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * CLI graph handling
  *
@@ -6,20 +7,6 @@
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
  * Copyright (C) 2013 by Open Source Routing.
  * Copyright (C) 2013 by Internet Systems Consortium, Inc. ("ISC")
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/command_graph.h b/lib/command_graph.h
index b8c7a9c72..8e84fa928 100644
--- a/lib/command_graph.h
+++ b/lib/command_graph.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * CLI graph handling
  *
@@ -6,20 +7,6 @@
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
  * Copyright (C) 2013 by Open Source Routing.
  * Copyright (C) 2013 by Internet Systems Consortium, Inc. ("ISC")
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_COMMAND_GRAPH_H
diff --git a/lib/command_lex.l b/lib/command_lex.l
index ec366ce7e..64f74498b 100644
--- a/lib/command_lex.l
+++ b/lib/command_lex.l
@@ -1,25 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * Command format string lexer for CLI backend.
  *
  * --
  * Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GNU Zebra; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 %top{
diff --git a/lib/command_match.c b/lib/command_match.c
index 6c1d05d92..5ed643bc9 100644
--- a/lib/command_match.c
+++ b/lib/command_match.c
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Input matching routines for CLI backend.
  *
  * --
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/command_match.h b/lib/command_match.h
index 0488cc1a1..db2a8535e 100644
--- a/lib/command_match.h
+++ b/lib/command_match.h
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Input matching routines for CLI backend.
  *
  * --
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_COMMAND_MATCH_H
diff --git a/lib/command_parse.y b/lib/command_parse.y
index 35c119691..a29e090ef 100644
--- a/lib/command_parse.y
+++ b/lib/command_parse.y
@@ -1,25 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Command format string parser for CLI backend.
  *
  * --
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GNU Zebra; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 %{
diff --git a/lib/command_py.c b/lib/command_py.c
index cce9542e3..ceea5883d 100644
--- a/lib/command_py.c
+++ b/lib/command_py.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * clippy (CLI preparator in python) wrapper for FRR command_graph
  * Copyright (C) 2016-2017  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* note: this wrapper is intended to be used as build-time helper.  while
diff --git a/lib/compiler.h b/lib/compiler.h
index 514f0cee6..d12e28283 100644
--- a/lib/compiler.h
+++ b/lib/compiler.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-2017  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_COMPILER_H
diff --git a/lib/cspf.c b/lib/cspf.c
index ef3e7c2fa..b92c9cb39 100644
--- a/lib/cspf.c
+++ b/lib/cspf.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Constraints Shortest Path First algorithms - cspf.c
  *
@@ -6,20 +7,6 @@
  * Copyright (C) 2022 Orange http://www.orange.com
  *
  * This file is part of Free Range Routing (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/cspf.h b/lib/cspf.h
index 6466ddb25..3eceaa04a 100644
--- a/lib/cspf.h
+++ b/lib/cspf.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Constraints Shortest Path First algorithms definition - cspf.h
  *
@@ -6,20 +7,6 @@
  * Copyright (C) 2022 Orange http://www.orange.com
  *
  * This file is part of Free Range Routing (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_CSPF_H_
diff --git a/lib/csv.c b/lib/csv.c
index 05b9dbe39..fdd89a0c7 100644
--- a/lib/csv.c
+++ b/lib/csv.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* CSV
  * Copyright (C) 2013,2020  Cumulus Networks, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/csv.h b/lib/csv.h
index fe3599d5d..c780ab652 100644
--- a/lib/csv.h
+++ b/lib/csv.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* CSV
  * Copyright (C) 2013 Cumulus Networks, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __CSV_H__
diff --git a/lib/db.c b/lib/db.c
index b4286b8d2..55f29adfb 100644
--- a/lib/db.c
+++ b/lib/db.c
@@ -1,35 +1,10 @@
+// SPDX-License-Identifier: ISC AND GPL-2.0-or-later
 /*
  * Copyright (c) 2018 Rafael Zalamena <rzalamena@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
  * Copyright (c) 2016 Rafael Zalamena <rzalamena@gmail.com>
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/lib/db.h b/lib/db.h
index c8ce7fe57..887af0e1b 100644
--- a/lib/db.h
+++ b/lib/db.h
@@ -1,35 +1,10 @@
+// SPDX-License-Identifier: ISC AND GPL-2.0-or-later
 /*
  * Copyright (c) 2018 Rafael Zalamena <rzalamena@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
  * Copyright (c) 2016 Rafael Zalamena <rzalamena@gmail.com>
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_DB_H_
diff --git a/lib/debug.c b/lib/debug.c
index e2ba4cd4e..757a47ab9 100644
--- a/lib/debug.c
+++ b/lib/debug.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Debugging utilities.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include "typesafe.h"
diff --git a/lib/debug.h b/lib/debug.h
index a72657bda..e9d8a31ab 100644
--- a/lib/debug.h
+++ b/lib/debug.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Debugging utilities.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _FRRDEBUG_H
 #define _FRRDEBUG_H
diff --git a/lib/defaults.c b/lib/defaults.c
index fe099b646..04b5fd36f 100644
--- a/lib/defaults.c
+++ b/lib/defaults.c
@@ -1,18 +1,7 @@
+// SPDX-License-Identifier: ISC
 /*
  * FRR switchable defaults.
  * Copyright (c) 2017-2019  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/lib/defaults.h b/lib/defaults.h
index 55250f0f8..afb3223db 100644
--- a/lib/defaults.h
+++ b/lib/defaults.h
@@ -1,18 +1,7 @@
+// SPDX-License-Identifier: ISC
 /*
  * FRR switchable defaults.
  * Copyright (C) 2017-2019  David Lamparter for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_DEFAULTS_H
diff --git a/lib/defun_lex.l b/lib/defun_lex.l
index af506f13d..505ea59b0 100644
--- a/lib/defun_lex.l
+++ b/lib/defun_lex.l
@@ -1,20 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * clippy (CLI preparator in python) C pseudo-lexer
  * Copyright (C) 2016-2017  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* This is just enough of a lexer to make rough sense of a C source file.
diff --git a/lib/distribute.c b/lib/distribute.c
index 0f503d2ab..4cfdcc784 100644
--- a/lib/distribute.c
+++ b/lib/distribute.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Distribute list functions
  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/distribute.h b/lib/distribute.h
index 6b3226e8b..75783712a 100644
--- a/lib/distribute.h
+++ b/lib/distribute.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Distribute list functions header
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_DISTRIBUTE_H
diff --git a/lib/elf_py.c b/lib/elf_py.c
index 7c503cfb9..05f5aef76 100644
--- a/lib/elf_py.c
+++ b/lib/elf_py.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * fast ELF file accessor
  * Copyright (C) 2018-2020  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* Note: this wrapper is intended to be used as build-time helper.  While
diff --git a/lib/ferr.c b/lib/ferr.c
index 4e4152621..5998befec 100644
--- a/lib/ferr.c
+++ b/lib/ferr.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/ferr.h b/lib/ferr.h
index 9accde169..f0191dffb 100644
--- a/lib/ferr.h
+++ b/lib/ferr.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_FERR_H
diff --git a/lib/filter.c b/lib/filter.c
index fc4b578e7..f86adab5d 100644
--- a/lib/filter.c
+++ b/lib/filter.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Route filtering function.
  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/filter.h b/lib/filter.h
index b378288c5..e092f0771 100644
--- a/lib/filter.h
+++ b/lib/filter.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Route filtering function.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_FILTER_H
diff --git a/lib/filter_cli.c b/lib/filter_cli.c
index 5accea3f0..7ef0d47f6 100644
--- a/lib/filter_cli.c
+++ b/lib/filter_cli.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * FRR filter CLI implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include "zebra.h"
diff --git a/lib/filter_nb.c b/lib/filter_nb.c
index cfe310538..a14f23233 100644
--- a/lib/filter_nb.c
+++ b/lib/filter_nb.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * FRR filter northbound implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include "zebra.h"
diff --git a/lib/freebsd-queue.h b/lib/freebsd-queue.h
index 793cfff8d..d53df9c77 100644
--- a/lib/freebsd-queue.h
+++ b/lib/freebsd-queue.h
@@ -1,31 +1,8 @@
+// SPDX-License-Identifier: BSD-3-Clause
 /*-
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
  *	@(#)queue.h	8.5 (Berkeley) 8/20/94
  * $FreeBSD$
  */
diff --git a/lib/frr_pthread.c b/lib/frr_pthread.c
index dd675bbb8..0c617238f 100644
--- a/lib/frr_pthread.c
+++ b/lib/frr_pthread.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Utilities and interfaces for managing POSIX threads within FRR.
  * Copyright (C) 2017  Cumulus Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/frr_pthread.h b/lib/frr_pthread.h
index 89519abae..b1d08717f 100644
--- a/lib/frr_pthread.h
+++ b/lib/frr_pthread.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Utilities and interfaces for managing POSIX threads within FRR.
  * Copyright (C) 2017  Cumulus Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_PTHREAD_H
diff --git a/lib/frr_zmq.c b/lib/frr_zmq.c
index db5c4c91a..2673d5760 100644
--- a/lib/frr_zmq.c
+++ b/lib/frr_zmq.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * libzebra ZeroMQ bindings
  * Copyright (C) 2015  David Lamparter
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/lib/frr_zmq.h b/lib/frr_zmq.h
index b3be78cbe..f12291d60 100644
--- a/lib/frr_zmq.h
+++ b/lib/frr_zmq.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * libzebra ZeroMQ bindings
  * Copyright (C) 2015  David Lamparter
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRRZMQ_H
diff --git a/lib/frratomic.h b/lib/frratomic.h
index bafc6445e..3a8905223 100644
--- a/lib/frratomic.h
+++ b/lib/frratomic.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRRATOMIC_H
diff --git a/lib/frrcu.c b/lib/frrcu.c
index 0e717a98a..c7cc655e0 100644
--- a/lib/frrcu.c
+++ b/lib/frrcu.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2017-19  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 /* implementation notes:  this is an epoch-based RCU implementation.  rcu_seq
diff --git a/lib/frrcu.h b/lib/frrcu.h
index ae840926b..e7a54dcbe 100644
--- a/lib/frrcu.h
+++ b/lib/frrcu.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2017-19  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRRCU_H
diff --git a/lib/frrlua.c b/lib/frrlua.c
index 535649eff..5b49d32a9 100644
--- a/lib/frrlua.c
+++ b/lib/frrlua.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This file defines the lua interface into
  * FRRouting.
  *
  * Copyright (C) 2016-2019 Cumulus Networks, Inc.
  * Donald Sharp, Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/frrlua.h b/lib/frrlua.h
index a82009a77..bf6eb5fd9 100644
--- a/lib/frrlua.h
+++ b/lib/frrlua.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016-2019 Cumulus Networks, Inc.
  * Donald Sharp, Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __FRRLUA_H__
 #define __FRRLUA_H__
diff --git a/lib/frrscript.c b/lib/frrscript.c
index 2e5693261..4248a4500 100644
--- a/lib/frrscript.c
+++ b/lib/frrscript.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Scripting foo
  * Copyright (C) 2020  NVIDIA Corporation
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/lib/frrscript.h b/lib/frrscript.h
index afaab66f1..7ba4f0cbd 100644
--- a/lib/frrscript.h
+++ b/lib/frrscript.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Scripting foo
  * Copyright (C) 2020  NVIDIA Corporation
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __FRRSCRIPT_H__
 #define __FRRSCRIPT_H__
diff --git a/lib/frrstr.c b/lib/frrstr.c
index d66c6f8c1..e5440c509 100644
--- a/lib/frrstr.c
+++ b/lib/frrstr.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * FRR string processing utilities.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  *                     Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/lib/frrstr.h b/lib/frrstr.h
index f0066d0fc..19ba09e21 100644
--- a/lib/frrstr.h
+++ b/lib/frrstr.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * FRR string processing utilities.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  *                     Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRRSTR_H_
diff --git a/lib/getopt.c b/lib/getopt.c
index a33d19601..9d0a31131 100644
--- a/lib/getopt.c
+++ b/lib/getopt.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Getopt for GNU.
  * NOTE: getopt is now part of the C library, so if you don't know what
  * "Keep this file name-space clean" means, talk to drepper@gnu.org
@@ -8,20 +9,6 @@
  *
  * NOTE: The canonical source of this file is maintained with the GNU C Library.
  * Bugs can be reported to bug-glibc@gnu.org.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.
diff --git a/lib/getopt.h b/lib/getopt.h
index 63e12e947..7863bdb66 100644
--- a/lib/getopt.h
+++ b/lib/getopt.h
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Declarations for getopt.
  * Copyright (C) 1989,90,91,92,93,94,96,97 Free Software Foundation, Inc.
  *
  * NOTE: The canonical source of this file is maintained with the GNU C Library.
  * Bugs can be reported to bug-glibc@gnu.org.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _GETOPT_H
diff --git a/lib/getopt1.c b/lib/getopt1.c
index a7fe25307..cf21c3aab 100644
--- a/lib/getopt1.c
+++ b/lib/getopt1.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* getopt_long and getopt_long_only entry points for GNU getopt.
  * Copyright (C) 1987,88,89,90,91,92,93,94,96,97,98
  * Free Software Foundation, Inc.
  *
  * NOTE: The canonical source of this file is maintained with the GNU C Library.
  * Bugs can be reported to bug-glibc@gnu.org.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/grammar_sandbox.c b/lib/grammar_sandbox.c
index a62178ba0..fc7ebebbe 100644
--- a/lib/grammar_sandbox.c
+++ b/lib/grammar_sandbox.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Testing shim and API examples for the new CLI backend.
  *
@@ -5,22 +6,6 @@
  * be used to test and interact with the new engine.
  * --
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/grammar_sandbox_main.c b/lib/grammar_sandbox_main.c
index a7d6c5137..cdb1c3adb 100644
--- a/lib/grammar_sandbox_main.c
+++ b/lib/grammar_sandbox_main.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Testing shim and API examples for the new CLI backend.
  *
@@ -6,21 +7,6 @@
  * --
  * Copyright (C) 2016 Cumulus Networks, Inc.
  * Copyright (C) 2017 David Lamparter for NetDEF, Inc.
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/graph.c b/lib/graph.c
index ba7314fb2..e6c2386d7 100644
--- a/lib/graph.c
+++ b/lib/graph.c
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Graph data structure.
  *
  * --
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include "graph.h"
diff --git a/lib/graph.h b/lib/graph.h
index 8e126e6be..bfdfe141e 100644
--- a/lib/graph.h
+++ b/lib/graph.h
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Graph data structure.
  *
  * --
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_COMMAND_GRAPH_H
diff --git a/lib/hash.c b/lib/hash.c
index 4b371b43a..97a77a2b9 100644
--- a/lib/hash.c
+++ b/lib/hash.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Hash routine.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/hash.h b/lib/hash.h
index 91770d181..f32309d80 100644
--- a/lib/hash.h
+++ b/lib/hash.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Hash routine.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_HASH_H
diff --git a/lib/hook.c b/lib/hook.c
index 895243aad..1457df815 100644
--- a/lib/hook.c
+++ b/lib/hook.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2016  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/hook.h b/lib/hook.h
index d75e623ed..19e0f1fbf 100644
--- a/lib/hook.h
+++ b/lib/hook.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2016  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_HOOK_H
diff --git a/lib/iana_afi.h b/lib/iana_afi.h
index 41e83d45c..b9c19cc3d 100644
--- a/lib/iana_afi.h
+++ b/lib/iana_afi.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * iana_afi and safi definitions.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __IANA_AFI_H__
 
diff --git a/lib/id_alloc.c b/lib/id_alloc.c
index 9179dc429..477f6e351 100644
--- a/lib/id_alloc.c
+++ b/lib/id_alloc.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * FRR ID Number Allocator
  * Copyright (C) 2018  Amazon.com, Inc. or its affiliates
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/id_alloc.h b/lib/id_alloc.h
index 8705ffb37..8a1255ffd 100644
--- a/lib/id_alloc.h
+++ b/lib/id_alloc.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * FRR ID Number Allocator
  * Copyright (C) 2018  Amazon.com, Inc. or its affiliates
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ID_ALLOC_H
diff --git a/lib/if.c b/lib/if.c
index be7fe544c..08d891874 100644
--- a/lib/if.c
+++ b/lib/if.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Interface functions.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/if.h b/lib/if.h
index b79ed5ad8..c6b4fd216 100644
--- a/lib/if.h
+++ b/lib/if.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Interface related header.
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_IF_H
diff --git a/lib/if_rmap.c b/lib/if_rmap.c
index 8282e476d..fa8899e9f 100644
--- a/lib/if_rmap.c
+++ b/lib/if_rmap.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* route-map for interface.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/if_rmap.h b/lib/if_rmap.h
index dfc729882..3bdbc2a3b 100644
--- a/lib/if_rmap.h
+++ b/lib/if_rmap.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* route-map for interface.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_IF_RMAP_H
diff --git a/lib/imsg-buffer.c b/lib/imsg-buffer.c
index 4d4170270..4f041ff66 100644
--- a/lib/imsg-buffer.c
+++ b/lib/imsg-buffer.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$	*/
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/lib/imsg.c b/lib/imsg.c
index b46d5cbc2..057e4b3c3 100644
--- a/lib/imsg.c
+++ b/lib/imsg.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$	*/
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/lib/imsg.h b/lib/imsg.h
index 3f81b76be..4651eeea9 100644
--- a/lib/imsg.h
+++ b/lib/imsg.h
@@ -1,21 +1,10 @@
+// SPDX-License-Identifier: ISC
 /*	$OpenBSD$	*/
 
 /*
  * Copyright (c) 2006, 2007 Pierre-Yves Ritschard <pyr@openbsd.org>
  * Copyright (c) 2006, 2007, 2008 Reyk Floeter <reyk@openbsd.org>
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _IMSG_H_
diff --git a/lib/ipaddr.h b/lib/ipaddr.h
index 4934a83b4..e3ad14d7d 100644
--- a/lib/ipaddr.h
+++ b/lib/ipaddr.h
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IP address structure (for generic IPv4 or IPv6 address)
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef __IPADDR_H__
diff --git a/lib/json.c b/lib/json.c
index d85a21215..66312dbc8 100644
--- a/lib/json.c
+++ b/lib/json.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* json-c wrapper
  * Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/json.h b/lib/json.h
index 78c383651..4763803ac 100644
--- a/lib/json.h
+++ b/lib/json.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* json-c wrapper
  * Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_JSON_H
diff --git a/lib/keychain.c b/lib/keychain.c
index 5dcb572a3..640746bb4 100644
--- a/lib/keychain.c
+++ b/lib/keychain.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* key-chain for authentication.
  * Copyright (C) 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "config.h"
diff --git a/lib/keychain.h b/lib/keychain.h
index 71319d972..be93275a5 100644
--- a/lib/keychain.h
+++ b/lib/keychain.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* key-chain for authentication.
  * Copyright (C) 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_KEYCHAIN_H
diff --git a/lib/ldp_sync.c b/lib/ldp_sync.c
index 8912d1558..b01cf8728 100644
--- a/lib/ldp_sync.c
+++ b/lib/ldp_sync.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ldp_sync.c: LDP-SYNC handling routines
  * Copyright (C) 2020 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/ldp_sync.h b/lib/ldp_sync.h
index 0429e17d5..5b6ebbf88 100644
--- a/lib/ldp_sync.h
+++ b/lib/ldp_sync.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Defines and structures common to LDP-Sync for OSPFv2 and OSPFv3 and ISIS
  * Copyright (C) 2020 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _LIBLDPSYNC_H
diff --git a/lib/lib_errors.c b/lib/lib_errors.c
index a658e4c29..a96fac9cd 100644
--- a/lib/lib_errors.c
+++ b/lib/lib_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Library-specific error messages.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  *                     Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/lib_errors.h b/lib/lib_errors.h
index 91f206f74..8cdfb166c 100644
--- a/lib/lib_errors.h
+++ b/lib/lib_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Library-specific error messages.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  *                     Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __LIB_ERRORS_H__
diff --git a/lib/lib_vty.c b/lib/lib_vty.c
index 46a0a6810..2c8f2e904 100644
--- a/lib/lib_vty.c
+++ b/lib/lib_vty.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Assorted library VTY commands
  *
  * Copyright (C) 1998 Kunihiro Ishiguro
  * Copyright (C) 2016-2017  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/lib_vty.h b/lib/lib_vty.h
index 48e409ec5..47673322a 100644
--- a/lib/lib_vty.h
+++ b/lib/lib_vty.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Memory management routine
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_LIB_VTY_H
diff --git a/lib/libfrr.c b/lib/libfrr.c
index 2cab6d982..0467dc1d7 100644
--- a/lib/libfrr.c
+++ b/lib/libfrr.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * libfrr overall management functions
  *
  * Copyright (C) 2016  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/libfrr.h b/lib/libfrr.h
index 69054e426..97e9b93c1 100644
--- a/lib/libfrr.h
+++ b/lib/libfrr.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * libfrr overall management functions
  *
  * Copyright (C) 2016  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_FRR_H
diff --git a/lib/libfrr_trace.h b/lib/libfrr_trace.h
index 7215007ff..92c469706 100644
--- a/lib/libfrr_trace.h
+++ b/lib/libfrr_trace.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Tracing
  *
  * Copyright (C) 2020  NVIDIA Corporation
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #if !defined(_LIBFRR_TRACE_H_) || defined(TRACEPOINT_HEADER_MULTI_READ)
diff --git a/lib/libospf.h b/lib/libospf.h
index 161c7635d..3262534de 100644
--- a/lib/libospf.h
+++ b/lib/libospf.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Defines and structures common to OSPFv2 and OSPFv3
  * Copyright (C) 1998, 99, 2000 Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _LIBOSPFD_H
diff --git a/lib/link_state.c b/lib/link_state.c
index 9649a5f37..589c0ae70 100644
--- a/lib/link_state.c
+++ b/lib/link_state.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Link State Database - link_state.c
  *
@@ -6,20 +7,6 @@
  * Copyright (C) 2020 Orange http://www.orange.com
  *
  * This file is part of Free Range Routing (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/link_state.h b/lib/link_state.h
index 35e6c9311..e6a6388ba 100644
--- a/lib/link_state.h
+++ b/lib/link_state.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Link State Database definition - ted.h
  *
@@ -6,20 +7,6 @@
  * Copyright (C) 2020 Orange http://www.orange.com
  *
  * This file is part of Free Range Routing (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_LINK_STATE_H_
diff --git a/lib/linklist.c b/lib/linklist.c
index d2a29b7ed..28dd777b8 100644
--- a/lib/linklist.c
+++ b/lib/linklist.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Generic linked list routine.
  * Copyright (C) 1997, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/linklist.h b/lib/linklist.h
index e7594728f..fd953d076 100644
--- a/lib/linklist.h
+++ b/lib/linklist.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Generic linked list
  * Copyright (C) 1997, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_LINKLIST_H
diff --git a/lib/log.c b/lib/log.c
index 156982635..b1a06bfb2 100644
--- a/lib/log.c
+++ b/lib/log.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Logging of zebra
  * Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #define FRR_DEFINE_DESC_TABLE
diff --git a/lib/log.h b/lib/log.h
index 3011fa9a9..8e94d3fd8 100644
--- a/lib/log.h
+++ b/lib/log.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra logging funcions.
  * Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_LOG_H
diff --git a/lib/log_filter.c b/lib/log_filter.c
index df74a8c9b..e8d99d792 100644
--- a/lib/log_filter.c
+++ b/lib/log_filter.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Logging - Filtered file log target
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *                    Stephen Worley
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/log_vty.c b/lib/log_vty.c
index 4091c92c7..fc28ffc6f 100644
--- a/lib/log_vty.c
+++ b/lib/log_vty.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Logging - VTY code
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *                    Stephen Worley
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/log_vty.h b/lib/log_vty.h
index db46b3cb5..8450cd0ef 100644
--- a/lib/log_vty.h
+++ b/lib/log_vty.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Logging - VTY library
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *                    Stephen Worley
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __LOG_VTY_H__
diff --git a/lib/md5.c b/lib/md5.c
index 20da6488c..a62d937a3 100644
--- a/lib/md5.c
+++ b/lib/md5.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause
 /*
  * Copyright (C) 2004 6WIND
  *                          <Vincent.Jardin@6WIND.com>
@@ -9,30 +10,6 @@
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the project nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
  */
 
 #include <zebra.h>
diff --git a/lib/md5.h b/lib/md5.h
index 691a29433..b22da4735 100644
--- a/lib/md5.h
+++ b/lib/md5.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause
 /*
  * Copyright (C) 2004 6WIND
  *                          <Vincent.Jardin@6WIND.com>
@@ -9,30 +10,6 @@
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the project nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
  */
 
 #ifndef _LIBZEBRA_MD5_H_
diff --git a/lib/memory.c b/lib/memory.c
index 18811777a..8fbe5c409 100644
--- a/lib/memory.c
+++ b/lib/memory.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/lib/memory.h b/lib/memory.h
index c95602f48..ba437ebd0 100644
--- a/lib/memory.h
+++ b/lib/memory.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _QUAGGA_MEMORY_H
diff --git a/lib/mlag.c b/lib/mlag.c
index 9f346d77b..a370bf892 100644
--- a/lib/mlag.c
+++ b/lib/mlag.c
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* mlag generic code.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #include <zebra.h>
 
diff --git a/lib/mlag.h b/lib/mlag.h
index 37bb3aa6d..3aef0d77a 100644
--- a/lib/mlag.h
+++ b/lib/mlag.h
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* mlag header.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #ifndef __MLAG_H__
 #define __MLAG_H__
diff --git a/lib/module.c b/lib/module.c
index 4037bfbeb..af7d20c3d 100644
--- a/lib/module.c
+++ b/lib/module.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include "config.h"
diff --git a/lib/module.h b/lib/module.h
index ae1ca2f75..cd2be474e 100644
--- a/lib/module.h
+++ b/lib/module.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_MODULE_H
diff --git a/lib/monotime.h b/lib/monotime.h
index 89616c542..f7ae1bbbe 100644
--- a/lib/monotime.h
+++ b/lib/monotime.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2017  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_MONOTIME_H
diff --git a/lib/mpls.c b/lib/mpls.c
index 1b21dd29f..8c656f78f 100644
--- a/lib/mpls.c
+++ b/lib/mpls.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * mpls functions
  *
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include <mpls.h>
diff --git a/lib/mpls.h b/lib/mpls.h
index 069e560f8..dc7f912c2 100644
--- a/lib/mpls.h
+++ b/lib/mpls.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * MPLS definitions
  * Copyright 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_MPLS_H
diff --git a/lib/netns_linux.c b/lib/netns_linux.c
index 43c0d8c35..297e2c595 100644
--- a/lib/netns_linux.c
+++ b/lib/netns_linux.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * NS functions.
  * Copyright (C) 2014 6WIND S.A.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/netns_other.c b/lib/netns_other.c
index b6570d3b9..30218409d 100644
--- a/lib/netns_other.c
+++ b/lib/netns_other.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * NetNS backend for non Linux systems
  * Copyright (C) 2018 6WIND S.A.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/lib/network.c b/lib/network.c
index cd62b8b59..af1c7db44 100644
--- a/lib/network.c
+++ b/lib/network.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Network library.
  * Copyright (C) 1997 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/network.h b/lib/network.h
index c163eab8f..3a0e8718b 100644
--- a/lib/network.h
+++ b/lib/network.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Network library header.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_NETWORK_H
diff --git a/lib/nexthop.c b/lib/nexthop.c
index 248acd270..b04c95c05 100644
--- a/lib/nexthop.c
+++ b/lib/nexthop.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* A generic nexthop structure
  * Copyright (C) 2013 Cumulus Networks, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/lib/nexthop.h b/lib/nexthop.h
index f1309aa52..1d95a3eee 100644
--- a/lib/nexthop.h
+++ b/lib/nexthop.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Nexthop structure definition.
  * Copyright (C) 1997, 98, 99, 2001 Kunihiro Ishiguro
  * Copyright (C) 2013 Cumulus Networks, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _LIB_NEXTHOP_H
diff --git a/lib/nexthop_group.c b/lib/nexthop_group.c
index fd7eee213..0613fc673 100644
--- a/lib/nexthop_group.c
+++ b/lib/nexthop_group.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Nexthop Group structure definition.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/lib/nexthop_group.h b/lib/nexthop_group.h
index 4d560fc43..78237e464 100644
--- a/lib/nexthop_group.h
+++ b/lib/nexthop_group.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Nexthop Group structure definition.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __NEXTHOP_GROUP__
diff --git a/lib/nexthop_group_private.h b/lib/nexthop_group_private.h
index 4abda624a..b05718677 100644
--- a/lib/nexthop_group_private.h
+++ b/lib/nexthop_group_private.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Nexthop Group Private Functions.
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *                    Stephen Worley
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
diff --git a/lib/northbound.c b/lib/northbound.c
index 6a014f37b..b755264be 100644
--- a/lib/northbound.c
+++ b/lib/northbound.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/northbound.h b/lib/northbound.h
index a330bd1a3..c132daebd 100644
--- a/lib/northbound.h
+++ b/lib/northbound.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_NORTHBOUND_H_
diff --git a/lib/northbound_cli.c b/lib/northbound_cli.c
index e0dcdb490..0dfa66b37 100644
--- a/lib/northbound_cli.c
+++ b/lib/northbound_cli.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/northbound_cli.h b/lib/northbound_cli.h
index d848507e0..ef2ef44eb 100644
--- a/lib/northbound_cli.h
+++ b/lib/northbound_cli.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_NORTHBOUND_CLI_H_
diff --git a/lib/northbound_confd.c b/lib/northbound_confd.c
index 27eaefd07..81ba313e8 100644
--- a/lib/northbound_confd.c
+++ b/lib/northbound_confd.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/northbound_db.c b/lib/northbound_db.c
index dce9b2ec2..cefcfbcf1 100644
--- a/lib/northbound_db.c
+++ b/lib/northbound_db.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/northbound_db.h b/lib/northbound_db.h
index 14df09caa..07a27836c 100644
--- a/lib/northbound_db.h
+++ b/lib/northbound_db.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_NORTHBOUND_DB_H_
diff --git a/lib/northbound_grpc.cpp b/lib/northbound_grpc.cpp
index 95721ffc7..f5d59d92d 100644
--- a/lib/northbound_grpc.cpp
+++ b/lib/northbound_grpc.cpp
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 //
 // Copyright (c) 2021-2022, LabN Consulting, L.L.C
 // Copyright (C) 2019  NetDEF, Inc.
 //                     Renato Westphal
 //
-// This program is free software; you can redistribute it and/or modify it
-// under the terms of the GNU General Public License as published by the Free
-// Software Foundation; either version 2 of the License, or (at your option)
-// any later version.
-//
-// This program is distributed in the hope that it will be useful, but WITHOUT
-// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-// more details.
-//
-// You should have received a copy of the GNU General Public License along
-// with this program; see the file COPYING; if not, write to the Free Software
-// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-//
 
 #include <zebra.h>
 #include <grpcpp/grpcpp.h>
diff --git a/lib/northbound_sysrepo.c b/lib/northbound_sysrepo.c
index f035ac861..824d81a51 100644
--- a/lib/northbound_sysrepo.c
+++ b/lib/northbound_sysrepo.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/ns.h b/lib/ns.h
index 93a3781c1..46c0dd786 100644
--- a/lib/ns.h
+++ b/lib/ns.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * NS related header.
  * Copyright (C) 2014 6WIND S.A.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_NS_H
diff --git a/lib/ntop.c b/lib/ntop.c
index 1b2dd7a6d..49e1b152c 100644
--- a/lib/ntop.c
+++ b/lib/ntop.c
@@ -1,19 +1,8 @@
+// SPDX-License-Identifier: ISC
 /*
  * optimized ntop, about 10x faster than libc versions [as of 2019]
  *
  * Copyright (c) 2019  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/openbsd-queue.h b/lib/openbsd-queue.h
index d4c08a3be..df3bbd720 100644
--- a/lib/openbsd-queue.h
+++ b/lib/openbsd-queue.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause
 /*	$OpenBSD: queue.h,v 1.43 2015/12/28 19:38:40 millert Exp $	*/
 /*	$NetBSD: queue.h,v 1.11 1996/05/16 05:17:14 mycroft Exp $	*/
 
@@ -5,30 +6,6 @@
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
  *	@(#)queue.h	8.5 (Berkeley) 8/20/94
  */
 
diff --git a/lib/openbsd-tree.c b/lib/openbsd-tree.c
index 98d2e155e..c09ac2fd4 100644
--- a/lib/openbsd-tree.c
+++ b/lib/openbsd-tree.c
@@ -1,44 +1,12 @@
+// SPDX-License-Identifier: ISC AND BSD-2-Clause
 /*	$OpenBSD: subr_tree.c,v 1.9 2017/06/08 03:30:52 dlg Exp $ */
 
 /*
  * Copyright 2002 Niels Provos <provos@citi.umich.edu>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 /*
  * Copyright (c) 2016 David Gwynne <dlg@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/openbsd-tree.h b/lib/openbsd-tree.h
index 832a10141..4f3985bbc 100644
--- a/lib/openbsd-tree.h
+++ b/lib/openbsd-tree.h
@@ -1,27 +1,7 @@
+// SPDX-License-Identifier: ISC AND BSD-2-Clause
 /*	$OpenBSD: tree.h,v 1.14 2015/05/25 03:07:49 deraadt Exp $	*/
 /*
  * Copyright 2002 Niels Provos <provos@citi.umich.edu>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _SYS_TREE_H_
@@ -318,18 +298,6 @@ extern "C" {
 
 /*
  * Copyright (c) 2016 David Gwynne <dlg@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #define RB_BLACK	0
diff --git a/lib/pbr.h b/lib/pbr.h
index b14ba0750..e8563afb3 100644
--- a/lib/pbr.h
+++ b/lib/pbr.h
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Policy Based Routing (PBR) main header
  * Copyright (C) 2018 6WIND
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _PBR_H
diff --git a/lib/pid_output.c b/lib/pid_output.c
index b82dde825..064a7bb47 100644
--- a/lib/pid_output.c
+++ b/lib/pid_output.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Process id output.
  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/plist.c b/lib/plist.c
index 17e692d13..e286a32f9 100644
--- a/lib/plist.c
+++ b/lib/plist.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Prefix list functions.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/plist.h b/lib/plist.h
index c9507df57..f31d8e879 100644
--- a/lib/plist.h
+++ b/lib/plist.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Prefix list functions.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_PLIST_H
diff --git a/lib/plist_int.h b/lib/plist_int.h
index 397557b37..d33ac0f73 100644
--- a/lib/plist_int.h
+++ b/lib/plist_int.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Prefix list internal definitions.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_PLIST_INT_H
diff --git a/lib/prefix.c b/lib/prefix.c
index 9d6dc7357..655e28c9f 100644
--- a/lib/prefix.c
+++ b/lib/prefix.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Prefix related functions.
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/prefix.h b/lib/prefix.h
index 7de8d7903..1fd652507 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Prefix structure.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_PREFIX_H
diff --git a/lib/printf/glue.c b/lib/printf/glue.c
index 3ac6e2c0a..25e2ff37a 100644
--- a/lib/printf/glue.c
+++ b/lib/printf/glue.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2019  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/printfrr.h b/lib/printfrr.h
index a2d113ba1..b8bef562d 100644
--- a/lib/printfrr.h
+++ b/lib/printfrr.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2019  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_PRINTFRR_H
diff --git a/lib/privs.c b/lib/privs.c
index 08461d8d5..accd9895f 100644
--- a/lib/privs.c
+++ b/lib/privs.c
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra privileges.
  *
  * Copyright (C) 2003 Paul Jakma.
  * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include "log.h"
diff --git a/lib/privs.h b/lib/privs.h
index bc0786178..d4a9609b5 100644
--- a/lib/privs.h
+++ b/lib/privs.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra privileges header.
  *
  * Copyright (C) 2003 Paul Jakma.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_PRIVS_H
diff --git a/lib/ptm_lib.c b/lib/ptm_lib.c
index e00dd5429..ac800be0a 100644
--- a/lib/ptm_lib.c
+++ b/lib/ptm_lib.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* PTM Library
  * Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/ptm_lib.h b/lib/ptm_lib.h
index c2170407c..1f17f767f 100644
--- a/lib/ptm_lib.h
+++ b/lib/ptm_lib.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* PTM Library
  * Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __PTM_LIB_H__
 #define __PTM_LIB_H__
diff --git a/lib/pullwr.c b/lib/pullwr.c
index 5e836984b..5bc566c28 100644
--- a/lib/pullwr.c
+++ b/lib/pullwr.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Pull-driven write event handler
  * Copyright (C) 2019  David Lamparter
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/lib/pullwr.h b/lib/pullwr.h
index a0e89e0c3..77ecf855b 100644
--- a/lib/pullwr.h
+++ b/lib/pullwr.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Pull-driven write event handler
  * Copyright (C) 2019  David Lamparter
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _WRITEPOLL_H
diff --git a/lib/pw.h b/lib/pw.h
index 2fc4a61f9..17f7bdac0 100644
--- a/lib/pw.h
+++ b/lib/pw.h
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Pseudowire definitions
  * Copyright (C) 2016 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #ifndef _FRR_PW_H
diff --git a/lib/qobj.c b/lib/qobj.c
index c6cb36c05..09b156ba3 100644
--- a/lib/qobj.c
+++ b/lib/qobj.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/qobj.h b/lib/qobj.h
index 5012c98d7..a3883fdad 100644
--- a/lib/qobj.h
+++ b/lib/qobj.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _QOBJ_H
diff --git a/lib/queue.h b/lib/queue.h
index dab43e3c5..26a5d4d7e 100644
--- a/lib/queue.h
+++ b/lib/queue.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * lists and queues implementations
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_QUEUE_H
diff --git a/lib/resolver.c b/lib/resolver.c
index 0d64ad86e..2918576c0 100755..100644
--- a/lib/resolver.c
+++ b/lib/resolver.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* C-Ares integration to Quagga mainloop
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/resolver.h b/lib/resolver.h
index 988449693..d3f38f742 100644
--- a/lib/resolver.h
+++ b/lib/resolver.h
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* C-Ares integration to Quagga mainloop
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifndef _FRR_RESOLVER_H
diff --git a/lib/ringbuf.c b/lib/ringbuf.c
index 6efa8077c..3cd7b4987 100644
--- a/lib/ringbuf.c
+++ b/lib/ringbuf.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Circular buffer implementation.
  * Copyright (C) 2017 Cumulus Networks
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/lib/ringbuf.h b/lib/ringbuf.h
index b8f4d9798..2bef6d3a3 100644
--- a/lib/ringbuf.h
+++ b/lib/ringbuf.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Circular buffer implementation.
  * Copyright (C) 2017 Cumulus Networks
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _FRR_RINGBUF_H_
 #define _FRR_RINGBUF_H_
diff --git a/lib/route_opaque.h b/lib/route_opaque.h
index bf6081c05..82ff21ce9 100644
--- a/lib/route_opaque.h
+++ b/lib/route_opaque.h
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Opaque data for Zebra from other daemons.
  *
  * Copyright (C) 2021 Donatas Abraitis <donatas.abraitis@gmail.com>
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef FRR_ROUTE_OPAQUE_H
diff --git a/lib/route_types.pl b/lib/route_types.pl
index 8c216e13b..c75a86696 100755
--- a/lib/route_types.pl
+++ b/lib/route_types.pl
@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 ##
 ## Scan a file of route-type definitions (see eg route_types.txt) and
 ## generate a corresponding header file with:
@@ -10,22 +11,6 @@
 ##
 ##
 ## Copyright (C) 2009 David Lamparter.
-## This file is part of GNU Zebra.
-##
-## GNU Zebra is free software; you can redistribute it and/or modify it
-## under the terms of the GNU General Public License as published by the
-## Free Software Foundation; either version 2, or (at your option) any
-## later version.
-##
-## GNU Zebra is distributed in the hope that it will be useful, but
-## WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-## General Public License for more details.
-##
-## You should have received a copy of the GNU General Public License
-## along with GNU Zebra; see the file COPYING.  If not, write to the Free
-## Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-## 02111-1307, USA.
 ##
 
 use strict;
diff --git a/lib/routemap.c b/lib/routemap.c
index 4b9033594..6b4627082 100644
--- a/lib/routemap.c
+++ b/lib/routemap.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Route map function.
  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/routemap.h b/lib/routemap.h
index ddcb8f2dd..2197a49e7 100644
--- a/lib/routemap.h
+++ b/lib/routemap.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Route map function.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ROUTEMAP_H
diff --git a/lib/routemap_cli.c b/lib/routemap_cli.c
index cedee83d8..4345b74bc 100644
--- a/lib/routemap_cli.c
+++ b/lib/routemap_cli.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Route map northbound CLI implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include <zebra.h>
diff --git a/lib/routemap_northbound.c b/lib/routemap_northbound.c
index 0ccfe98af..ab127dd0f 100644
--- a/lib/routemap_northbound.c
+++ b/lib/routemap_northbound.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Route map northbound implementation.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include <zebra.h>
diff --git a/lib/routing_nb.c b/lib/routing_nb.c
index 6238fb055..3d837bcc1 100644
--- a/lib/routing_nb.c
+++ b/lib/routing_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018        Vmware
  *                           Vishal Dhingra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/lib/routing_nb_config.c b/lib/routing_nb_config.c
index 594ad6c9e..f4fe48f5b 100644
--- a/lib/routing_nb_config.c
+++ b/lib/routing_nb_config.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018        Vmware
  *                           Vishal Dhingra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/sbuf.c b/lib/sbuf.c
index 3f1b02eaf..2762e4499 100644
--- a/lib/sbuf.c
+++ b/lib/sbuf.c
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Simple string buffer
  *
  * Copyright (C) 2017 Christian Franke
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #include <zebra.h>
 
diff --git a/lib/sbuf.h b/lib/sbuf.h
index e5a43c0e3..a73875a7d 100644
--- a/lib/sbuf.h
+++ b/lib/sbuf.h
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Simple string buffer
  *
  * Copyright (C) 2017 Christian Franke
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #ifndef SBUF_H
 #define SBUF_H
diff --git a/lib/seqlock.c b/lib/seqlock.c
index 77673146e..62ce31692 100644
--- a/lib/seqlock.c
+++ b/lib/seqlock.c
@@ -1,22 +1,8 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * "Sequence" lock primitive
  *
  * Copyright (C) 2015  David Lamparter <equinox@diac24.net>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA  02110-1301  USA
  */
 
 #define _GNU_SOURCE
diff --git a/lib/seqlock.h b/lib/seqlock.h
index bfbf97890..01735814f 100644
--- a/lib/seqlock.h
+++ b/lib/seqlock.h
@@ -1,22 +1,8 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * "Sequence" lock primitive
  *
  * Copyright (C) 2015  David Lamparter <equinox@diac24.net>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA  02110-1301  USA
  */
 
 #ifndef _SEQLOCK_H
diff --git a/lib/sha256.c b/lib/sha256.c
index f1727b632..ccf260fa7 100644
--- a/lib/sha256.c
+++ b/lib/sha256.c
@@ -1,27 +1,7 @@
+// SPDX-License-Identifier: BSD-2-Clause
 /*-
  * Copyright 2005,2007,2009 Colin Percival
  * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
  */
 
 #include <zebra.h>
diff --git a/lib/sha256.h b/lib/sha256.h
index c93d25305..dbadf4efd 100644
--- a/lib/sha256.h
+++ b/lib/sha256.h
@@ -1,28 +1,8 @@
+// SPDX-License-Identifier: BSD-2-Clause
 /*-
  * Copyright 2005,2007,2009 Colin Percival
  * All rights reserved.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
  * $FreeBSD: src/lib/libmd/sha256.h,v 1.2 2006/01/17 15:35:56 phk Exp $
  */
 
diff --git a/lib/sigevent.c b/lib/sigevent.c
index 985bedeb9..3ed34894e 100644
--- a/lib/sigevent.c
+++ b/lib/sigevent.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Quagga signal handling functions.
  * Copyright (C) 2004 Paul Jakma,
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/sigevent.h b/lib/sigevent.h
index dd1ee9958..e58b9a70c 100644
--- a/lib/sigevent.h
+++ b/lib/sigevent.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Quagga Signal handling header.
  *
  * Copyright (C) 2004 Paul Jakma.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_SIGNAL_H
diff --git a/lib/skiplist.c b/lib/skiplist.c
index 81407826f..fb8cb72e8 100644
--- a/lib/skiplist.c
+++ b/lib/skiplist.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: LicenseRef-Skiplist-BSD-0-Clause
 /*
  * Copyright 1990 William Pugh
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
- * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
  * Permission to include in quagga provide on March 31, 2016
  */
 
diff --git a/lib/skiplist.h b/lib/skiplist.h
index 165607820..39bfa39d3 100644
--- a/lib/skiplist.h
+++ b/lib/skiplist.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: LicenseRef-Skiplist-BSD-0-Clause
 /*
  * Copyright 1990 William Pugh
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
- * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
  * Permission to include in quagga provide on March 31, 2016
  */
 
diff --git a/lib/smux.h b/lib/smux.h
index 1d73406a2..28a303cf7 100644
--- a/lib/smux.h
+++ b/lib/smux.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* SNMP support
  * Copyright (C) 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_SNMP_H
diff --git a/lib/snmp.c b/lib/snmp.c
index 8d8b3c950..d28e6494b 100644
--- a/lib/snmp.c
+++ b/lib/snmp.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* SNMP support
  * Copyright (C) 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/sockopt.c b/lib/sockopt.c
index de11a9eab..0c4adb0b7 100644
--- a/lib/sockopt.c
+++ b/lib/sockopt.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* setsockopt functions
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/sockopt.h b/lib/sockopt.h
index 694edf763..ce7d665fa 100644
--- a/lib/sockopt.h
+++ b/lib/sockopt.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Router advertisement
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_SOCKOPT_H
diff --git a/lib/sockunion.c b/lib/sockunion.c
index 36ae21fdd..c37ab1d6d 100644
--- a/lib/sockunion.c
+++ b/lib/sockunion.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Socket union related function.
  * Copyright (c) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/sockunion.h b/lib/sockunion.h
index 8ace3e478..e50725599 100644
--- a/lib/sockunion.h
+++ b/lib/sockunion.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Socket union header.
  * Copyright (c) 1997 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_SOCKUNION_H
diff --git a/lib/spf_backoff.c b/lib/spf_backoff.c
index 117b7d3e8..1e80b5ec2 100644
--- a/lib/spf_backoff.c
+++ b/lib/spf_backoff.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of the IETF SPF delay algorithm
  * as explained in draft-ietf-rtgwg-backoff-algo-04
@@ -8,20 +9,6 @@
  * Copyright (C) 2017 by Christian Franke, Open Source Routing / NetDEF Inc.
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/spf_backoff.h b/lib/spf_backoff.h
index 2617195d7..87aa4a082 100644
--- a/lib/spf_backoff.h
+++ b/lib/spf_backoff.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of the IETF SPF delay algorithm
  * as explained in draft-ietf-rtgwg-backoff-algo-04
@@ -8,20 +9,6 @@
  * Copyright (C) 2017 by Christian Franke, Open Source Routing / NetDEF Inc.
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _ZEBRA_SPF_BACKOFF_H
 #define _ZEBRA_SPF_BACKOFF_H
diff --git a/lib/srcdest_table.c b/lib/srcdest_table.c
index 828cf2cce..3247a0372 100644
--- a/lib/srcdest_table.c
+++ b/lib/srcdest_table.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SRC-DEST Routing Table
  *
@@ -5,20 +6,6 @@
  *                       Open Source Routing / NetDEF Inc.
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/srcdest_table.h b/lib/srcdest_table.h
index 79afef9bb..ff97f9b73 100644
--- a/lib/srcdest_table.h
+++ b/lib/srcdest_table.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SRC-DEST Routing Table
  *
@@ -5,20 +6,6 @@
  *                       Open Source Routing / NetDEF Inc.
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_SRC_DEST_TABLE_H
diff --git a/lib/srte.h b/lib/srte.h
index d468c1cac..69c3dbcd8 100644
--- a/lib/srte.h
+++ b/lib/srte.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SR-TE definitions
  * Copyright 2020 NetDef Inc.
  *                Sascha Kattelmann
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_SRTE_H
diff --git a/lib/srv6.c b/lib/srv6.c
index f4077a86d..09835f3ea 100644
--- a/lib/srv6.c
+++ b/lib/srv6.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SRv6 definitions
  * Copyright (C) 2020  Hiroki Shirokura, LINE Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/lib/srv6.h b/lib/srv6.h
index acfb0631c..0d3ee7d2f 100644
--- a/lib/srv6.h
+++ b/lib/srv6.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SRv6 definitions
  * Copyright (C) 2020  Hiroki Shirokura, LINE Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_SRV6_H
diff --git a/lib/stream.c b/lib/stream.c
index 0756f9027..c6de3aefa 100644
--- a/lib/stream.c
+++ b/lib/stream.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Packet interface
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/stream.h b/lib/stream.h
index a3c148c9c..85eebb47b 100644
--- a/lib/stream.h
+++ b/lib/stream.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Packet interface
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_STREAM_H
diff --git a/lib/strformat.c b/lib/strformat.c
index d941a7f04..87d1715d2 100644
--- a/lib/strformat.c
+++ b/lib/strformat.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2019  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/strlcat.c b/lib/strlcat.c
index a046822a9..e3e29a72f 100644
--- a/lib/strlcat.c
+++ b/lib/strlcat.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /* Append a null-terminated string to another string, with length checking.
  * Copyright (C) 2016 Free Software Foundation, Inc.
  * This file is part of the GNU C Library.
- *
- * The GNU C Library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * The GNU C Library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with the GNU C Library; if not, see
- * <http://www.gnu.org/licenses/>.
  */
 
 /* adapted for Quagga from glibc patch submission originally from
diff --git a/lib/strlcpy.c b/lib/strlcpy.c
index 71ee9f1a5..74ea9cbc9 100644
--- a/lib/strlcpy.c
+++ b/lib/strlcpy.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /* Copy a null-terminated string to a fixed-size buffer, with length checking.
  * Copyright (C) 2016 Free Software Foundation, Inc.
  * This file is part of the GNU C Library.
- *
- * The GNU C Library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * The GNU C Library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with the GNU C Library; if not, see
- * <http://www.gnu.org/licenses/>.
  */
 
 /* adapted for Quagga from glibc patch submission originally from
diff --git a/lib/systemd.c b/lib/systemd.c
index 1c9a6f122..0106e88b9 100644
--- a/lib/systemd.c
+++ b/lib/systemd.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* lib/systemd Code
  * Copyright (C) 2016 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/systemd.h b/lib/systemd.h
index b9290930d..09f27a70b 100644
--- a/lib/systemd.h
+++ b/lib/systemd.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* lib/systemd Code
  * Copyright (C) 2016 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef __cplusplus
diff --git a/lib/table.c b/lib/table.c
index 6c4c6c7d3..380852b54 100644
--- a/lib/table.c
+++ b/lib/table.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Routing Table functions.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #define FRR_COMPILING_TABLE_C
diff --git a/lib/table.h b/lib/table.h
index 5dec69ee7..acfc87615 100644
--- a/lib/table.h
+++ b/lib/table.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Routing Table
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_TABLE_H
diff --git a/lib/tc.c b/lib/tc.c
index 1bc01ed3f..2e45add84 100644
--- a/lib/tc.c
+++ b/lib/tc.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Traffic Control (TC) main library
  * Copyright (C) 2022  Shichu Yang
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "tc.h"
diff --git a/lib/tc.h b/lib/tc.h
index ec68e1f4c..c4d23d633 100644
--- a/lib/tc.h
+++ b/lib/tc.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Traffic Control (TC) main header
  * Copyright (C) 2022  Shichu Yang
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _TC_H
diff --git a/lib/termtable.c b/lib/termtable.c
index 14362e144..30f1ab74c 100644
--- a/lib/termtable.c
+++ b/lib/termtable.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ASCII table generator.
  * Copyright (C) 2017  Cumulus Networks
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include <stdio.h>
diff --git a/lib/termtable.h b/lib/termtable.h
index e61c7fa30..3aa8caee8 100644
--- a/lib/termtable.h
+++ b/lib/termtable.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ASCII table generator.
  * Copyright (C) 2017  Cumulus Networks
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _TERMTABLE_H_
 #define _TERMTABLE_H_
diff --git a/lib/thread.c b/lib/thread.c
index 4078634f7..8324783a7 100644
--- a/lib/thread.c
+++ b/lib/thread.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Thread management routine
  * Copyright (C) 1998, 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* #define DEBUG */
diff --git a/lib/thread.h b/lib/thread.h
index acdcec51d..128d11b6e 100644
--- a/lib/thread.h
+++ b/lib/thread.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Thread management routine header.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_THREAD_H
diff --git a/lib/trace.h b/lib/trace.h
index 73fc10a55..a30f53cac 100644
--- a/lib/trace.h
+++ b/lib/trace.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Tracing macros
  *
  * Wraps tracepoint macros for different tracing systems to allow switching
@@ -11,20 +12,6 @@
  *
  * Copyright (C) 2020  NVIDIA Corporation
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _TRACE_H_
diff --git a/lib/typerb.c b/lib/typerb.c
index fe142ff35..af04307ca 100644
--- a/lib/typerb.c
+++ b/lib/typerb.c
@@ -1,44 +1,12 @@
+// SPDX-License-Identifier: ISC AND BSD-2-Clause
 /* RB-tree */
 
 /*
  * Copyright 2002 Niels Provos <provos@citi.umich.edu>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 /*
  * Copyright (c) 2016 David Gwynne <dlg@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/typerb.h b/lib/typerb.h
index 8ac182174..b020a665f 100644
--- a/lib/typerb.h
+++ b/lib/typerb.h
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: ISC
 /*
  * The following Red-Black tree implementation is based off code with
  * original copyright:
  *
  * Copyright (c) 2016 David Gwynne <dlg@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_TYPERB_H
diff --git a/lib/typesafe.c b/lib/typesafe.c
index 3b65a2d02..0da35d0f8 100644
--- a/lib/typesafe.c
+++ b/lib/typesafe.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2019  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/typesafe.h b/lib/typesafe.h
index 8aeabb34e..1e3f93256 100644
--- a/lib/typesafe.h
+++ b/lib/typesafe.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2016-2019  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_TYPESAFE_H
diff --git a/lib/vector.c b/lib/vector.c
index 5497c2428..bbea67c12 100644
--- a/lib/vector.c
+++ b/lib/vector.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Generic vector interface routine
  * Copyright (C) 1997 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/vector.h b/lib/vector.h
index 71c497a1b..fcbc13257 100644
--- a/lib/vector.h
+++ b/lib/vector.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Generic vector interface header.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_VECTOR_H
diff --git a/lib/version.h.in b/lib/version.h.in
index 5078f3ad6..7c3137904 100644
--- a/lib/version.h.in
+++ b/lib/version.h.in
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* @configure_input@
  *
  * Quagga version
  * Copyright (C) 1997, 1999 Kunihiro Ishiguro
- * 
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GNU Zebra; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.  
  */
 
 #ifndef _ZEBRA_VERSION_H
diff --git a/lib/vlan.h b/lib/vlan.h
index eea2633d4..a60104682 100644
--- a/lib/vlan.h
+++ b/lib/vlan.h
@@ -1,22 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* VLAN (802.1q) common header.
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef __VLAN_H__
diff --git a/lib/vrf.c b/lib/vrf.c
index baf25dfa0..a60f532f4 100644
--- a/lib/vrf.c
+++ b/lib/vrf.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRF functions.
  * Copyright (C) 2014 6WIND S.A.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/vrf.h b/lib/vrf.h
index 734176db9..956730bac 100644
--- a/lib/vrf.h
+++ b/lib/vrf.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRF related header.
  * Copyright (C) 2014 6WIND S.A.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_VRF_H
diff --git a/lib/vrf_int.h b/lib/vrf_int.h
index 8dc078e4f..bd40433d7 100644
--- a/lib/vrf_int.h
+++ b/lib/vrf_int.h
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRF Internal Header
  * Copyright (C) 2017 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #ifndef __LIB_VRF_PRIVATE_H__
 #define __LIB_VRF_PRIVATE_H__
diff --git a/lib/vty.c b/lib/vty.c
index 78e83696e..76dfe9734 100644
--- a/lib/vty.c
+++ b/lib/vty.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Virtual terminal [aka TeletYpe] interface routine.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/vty.h b/lib/vty.h
index 45349d91a..b8c677e35 100644
--- a/lib/vty.h
+++ b/lib/vty.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Virtual terminal [aka TeletYpe] interface routine
  * Copyright (C) 1997 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_VTY_H
diff --git a/lib/vxlan.h b/lib/vxlan.h
index 220fd8d23..65ff08e50 100644
--- a/lib/vxlan.h
+++ b/lib/vxlan.h
@@ -1,22 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* VxLAN common header.
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef __VXLAN_H__
diff --git a/lib/wheel.c b/lib/wheel.c
index f2776d609..4aca23481 100644
--- a/lib/wheel.c
+++ b/lib/wheel.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Timer Wheel
  * Copyright (C) 2016 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "zebra.h"
 #include "linklist.h"
diff --git a/lib/wheel.h b/lib/wheel.h
index 1e5a31b9a..9aa808cdf 100644
--- a/lib/wheel.h
+++ b/lib/wheel.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Timer Wheel
  * Copyright (C) 2016 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __WHEEL_H__
 #define __WHEEL_H__
diff --git a/lib/workqueue.c b/lib/workqueue.c
index a5338ba78..5477aadd6 100644
--- a/lib/workqueue.c
+++ b/lib/workqueue.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Quagga Work Queue Support.
  *
  * Copyright (C) 2005 Sun Microsystems, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/workqueue.h b/lib/workqueue.h
index 7866032fc..c7ed14b05 100644
--- a/lib/workqueue.h
+++ b/lib/workqueue.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Quagga Work Queues.
  *
  * Copyright (C) 2005 Sun Microsystems, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_WORK_QUEUE_H
diff --git a/lib/xref.c b/lib/xref.c
index 0d3549d06..fc0ba6298 100644
--- a/lib/xref.c
+++ b/lib/xref.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2017-20  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/lib/xref.h b/lib/xref.h
index 37242bd79..b49c9eb2f 100644
--- a/lib/xref.h
+++ b/lib/xref.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2017-20  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_XREF_H
diff --git a/lib/yang.c b/lib/yang.c
index ec8de85e9..78738f7d4 100644
--- a/lib/yang.c
+++ b/lib/yang.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/yang.h b/lib/yang.h
index 8b49df5e9..91cd641ce 100644
--- a/lib/yang.h
+++ b/lib/yang.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_YANG_H_
diff --git a/lib/yang_translator.c b/lib/yang_translator.c
index de5dc4d43..de668230a 100644
--- a/lib/yang_translator.c
+++ b/lib/yang_translator.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/yang_translator.h b/lib/yang_translator.h
index 55f396a43..16d55eb66 100644
--- a/lib/yang_translator.h
+++ b/lib/yang_translator.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_YANG_TRANSLATOR_H_
diff --git a/lib/yang_wrappers.c b/lib/yang_wrappers.c
index d22379dd2..509c4dd85 100644
--- a/lib/yang_wrappers.c
+++ b/lib/yang_wrappers.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/yang_wrappers.h b/lib/yang_wrappers.h
index c27e1e537..06e05872e 100644
--- a/lib/yang_wrappers.h
+++ b/lib/yang_wrappers.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_NORTHBOUND_WRAPPERS_H_
diff --git a/lib/zclient.c b/lib/zclient.c
index 57c038a03..0e49d6552 100644
--- a/lib/zclient.c
+++ b/lib/zclient.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra's client library.
  * Copyright (C) 1999 Kunihiro Ishiguro
  * Copyright (C) 2005 Andrew J. Schorr
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/lib/zclient.h b/lib/zclient.h
index 55957e4be..53c7038c8 100644
--- a/lib/zclient.h
+++ b/lib/zclient.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra's client header.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ZCLIENT_H
diff --git a/lib/zebra.h b/lib/zebra.h
index 8b783c514..ecc87f58f 100644
--- a/lib/zebra.h
+++ b/lib/zebra.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra common header.
  * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_H
diff --git a/lib/zlog.c b/lib/zlog.c
index e08d22b2b..e05720fd9 100644
--- a/lib/zlog.c
+++ b/lib/zlog.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-19  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include "zebra.h"
diff --git a/lib/zlog.h b/lib/zlog.h
index 6316a2ad4..a207b29a3 100644
--- a/lib/zlog.h
+++ b/lib/zlog.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-19  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_ZLOG_H
diff --git a/lib/zlog_5424.c b/lib/zlog_5424.c
index 60feca7fc..5264dda0f 100644
--- a/lib/zlog_5424.c
+++ b/lib/zlog_5424.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-21  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 /* when you work on this code, please install a fuzzer (e.g. AFL) and run
diff --git a/lib/zlog_5424.h b/lib/zlog_5424.h
index b4a12ccbf..377e7be22 100644
--- a/lib/zlog_5424.h
+++ b/lib/zlog_5424.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2021  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_ZLOG_5424_H
diff --git a/lib/zlog_5424_cli.c b/lib/zlog_5424_cli.c
index be0988e0b..7f070afbc 100644
--- a/lib/zlog_5424_cli.c
+++ b/lib/zlog_5424_cli.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2021  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/lib/zlog_live.c b/lib/zlog_live.c
index 931aa3461..4d3c3508b 100644
--- a/lib/zlog_live.c
+++ b/lib/zlog_live.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2019-22  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include "zebra.h"
diff --git a/lib/zlog_live.h b/lib/zlog_live.h
index 55e60ae67..17245fe19 100644
--- a/lib/zlog_live.h
+++ b/lib/zlog_live.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2019-22  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_ZLOG_LIVE_H
diff --git a/lib/zlog_targets.c b/lib/zlog_targets.c
index f7ea48bf9..b0f757149 100644
--- a/lib/zlog_targets.c
+++ b/lib/zlog_targets.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-19  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include "zebra.h"
diff --git a/lib/zlog_targets.h b/lib/zlog_targets.h
index 6faf722ff..d70834e7a 100644
--- a/lib/zlog_targets.h
+++ b/lib/zlog_targets.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2015-19  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifndef _FRR_ZLOG_TARGETS_H
diff --git a/nhrpd/linux.c b/nhrpd/linux.c
index 75e9f37a6..eb9816687 100644
--- a/nhrpd/linux.c
+++ b/nhrpd/linux.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP daemon Linux specific glue
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include "zebra.h"
diff --git a/nhrpd/netlink.h b/nhrpd/netlink.h
index f1143a2b5..7a3029b6c 100644
--- a/nhrpd/netlink.h
+++ b/nhrpd/netlink.h
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP netlink/neighbor table API
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include <zebra.h>
diff --git a/nhrpd/netlink_arp.c b/nhrpd/netlink_arp.c
index cd7fb7aed..877659b4c 100644
--- a/nhrpd/netlink_arp.c
+++ b/nhrpd/netlink_arp.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP netlink/neighbor table arpd code
  * Copyright (c) 2014-2016 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/nhrp_cache.c b/nhrpd/nhrp_cache.c
index a1b22645c..31b370cbf 100644
--- a/nhrpd/nhrp_cache.c
+++ b/nhrpd/nhrp_cache.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP cache
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include "zebra.h"
diff --git a/nhrpd/nhrp_errors.c b/nhrpd/nhrp_errors.c
index 741e64d8b..12ad7c6b6 100644
--- a/nhrpd/nhrp_errors.c
+++ b/nhrpd/nhrp_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * NHRP-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/nhrpd/nhrp_errors.h b/nhrpd/nhrp_errors.h
index d4958358f..d7867a478 100644
--- a/nhrpd/nhrp_errors.h
+++ b/nhrpd/nhrp_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * NHRP-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __NHRP_ERRORS_H__
diff --git a/nhrpd/nhrp_event.c b/nhrpd/nhrp_event.c
index e46a6d17c..9c1189083 100644
--- a/nhrpd/nhrp_event.c
+++ b/nhrpd/nhrp_event.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP event manager
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/nhrp_interface.c b/nhrpd/nhrp_interface.c
index 104c81bde..d396f510e 100644
--- a/nhrpd/nhrp_interface.c
+++ b/nhrpd/nhrp_interface.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP interface
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/nhrp_main.c b/nhrpd/nhrp_main.c
index bece89ca7..10d3c8f82 100644
--- a/nhrpd/nhrp_main.c
+++ b/nhrpd/nhrp_main.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP daemon main functions
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/nhrp_multicast.c b/nhrpd/nhrp_multicast.c
index 89be13b60..cdd79e25f 100644
--- a/nhrpd/nhrp_multicast.c
+++ b/nhrpd/nhrp_multicast.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP Multicast Support
  * Copyright (c) 2020-2021 4RF Limited
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/nhrp_nhs.c b/nhrpd/nhrp_nhs.c
index 03b4b533b..49f881df1 100644
--- a/nhrpd/nhrp_nhs.c
+++ b/nhrpd/nhrp_nhs.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP NHC nexthop server functions (registration)
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include "zebra.h"
diff --git a/nhrpd/nhrp_packet.c b/nhrpd/nhrp_packet.c
index 2407a8d36..ecf8aa0b1 100644
--- a/nhrpd/nhrp_packet.c
+++ b/nhrpd/nhrp_packet.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP packet handling functions
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/nhrp_peer.c b/nhrpd/nhrp_peer.c
index e7f2eaf5a..0c9d5ade3 100644
--- a/nhrpd/nhrp_peer.c
+++ b/nhrpd/nhrp_peer.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP peer functions
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/nhrp_protocol.h b/nhrpd/nhrp_protocol.h
index 3b94c814d..8cf1ebbcd 100644
--- a/nhrpd/nhrp_protocol.h
+++ b/nhrpd/nhrp_protocol.h
@@ -1,9 +1,7 @@
+// SPDX-License-Identifier: MIT
 /* nhrp_protocol.h - NHRP protocol definitions
  *
  * Copyright (c) 2007-2012 Timo Teräs <timo.teras@iki.fi>
- *
- * This software is licensed under the MIT License.
- * See MIT-LICENSE.txt for additional details.
  */
 
 #ifndef NHRP_PROTOCOL_H
diff --git a/nhrpd/nhrp_route.c b/nhrpd/nhrp_route.c
index aa0bbbc4c..bf7ba5f65 100644
--- a/nhrpd/nhrp_route.c
+++ b/nhrpd/nhrp_route.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP routing functions
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/nhrp_shortcut.c b/nhrpd/nhrp_shortcut.c
index 4975aca00..90fb1d67c 100644
--- a/nhrpd/nhrp_shortcut.c
+++ b/nhrpd/nhrp_shortcut.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP shortcut related functions
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/nhrp_vc.c b/nhrpd/nhrp_vc.c
index 4b45389da..bffb2f6e9 100644
--- a/nhrpd/nhrp_vc.c
+++ b/nhrpd/nhrp_vc.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP virtual connection
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include "zebra.h"
diff --git a/nhrpd/nhrp_vty.c b/nhrpd/nhrp_vty.c
index 53ba9eb12..40d38c44d 100644
--- a/nhrpd/nhrp_vty.c
+++ b/nhrpd/nhrp_vty.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP vty handling
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include "zebra.h"
diff --git a/nhrpd/nhrpd.h b/nhrpd/nhrpd.h
index 753c6e9b2..c01296bee 100644
--- a/nhrpd/nhrpd.h
+++ b/nhrpd/nhrpd.h
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* NHRP daemon internal structures and function prototypes
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifndef NHRPD_H
diff --git a/nhrpd/vici.c b/nhrpd/vici.c
index a54b43908..1dbb4e4f5 100644
--- a/nhrpd/vici.c
+++ b/nhrpd/vici.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* strongSwan VICI protocol implementation for NHRP
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/zbuf.c b/nhrpd/zbuf.c
index 3d54f4ed5..0eb8198b8 100644
--- a/nhrpd/zbuf.c
+++ b/nhrpd/zbuf.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Stream/packet buffer API implementation
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/zbuf.h b/nhrpd/zbuf.h
index d036b1046..23492b43c 100644
--- a/nhrpd/zbuf.h
+++ b/nhrpd/zbuf.h
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Stream/packet buffer API
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifndef ZBUF_H
diff --git a/nhrpd/znl.c b/nhrpd/znl.c
index 6030987a1..a65282fac 100644
--- a/nhrpd/znl.c
+++ b/nhrpd/znl.c
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Netlink helpers for zbuf
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/nhrpd/znl.h b/nhrpd/znl.h
index fd31daaf4..95dfae83f 100644
--- a/nhrpd/znl.h
+++ b/nhrpd/znl.h
@@ -1,10 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Netlink helpers for zbuf
  * Copyright (c) 2014-2015 Timo Teräs
- *
- * This file is free software: you may copy, redistribute and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include "zbuf.h"
diff --git a/ospf6d/ospf6_abr.c b/ospf6d/ospf6_abr.c
index e007709f9..0575f5abe 100644
--- a/ospf6d/ospf6_abr.c
+++ b/ospf6d/ospf6_abr.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Area Border Router function.
  * Copyright (C) 2004 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_abr.h b/ospf6d/ospf6_abr.h
index a4dc4ddc8..7bb161913 100644
--- a/ospf6d/ospf6_abr.h
+++ b/ospf6d/ospf6_abr.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2004 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_ABR_H
diff --git a/ospf6d/ospf6_area.c b/ospf6d/ospf6_area.c
index 6a4236e71..5795690a7 100644
--- a/ospf6d/ospf6_area.c
+++ b/ospf6d/ospf6_area.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_area.h b/ospf6d/ospf6_area.h
index 1c8c5dfd3..62b32d376 100644
--- a/ospf6d/ospf6_area.h
+++ b/ospf6d/ospf6_area.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF_AREA_H
diff --git a/ospf6d/ospf6_asbr.c b/ospf6d/ospf6_asbr.c
index 0fd6e15ed..05275c52e 100644
--- a/ospf6d/ospf6_asbr.c
+++ b/ospf6d/ospf6_asbr.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_asbr.h b/ospf6d/ospf6_asbr.h
index 0d2a98aeb..15982ca64 100644
--- a/ospf6d/ospf6_asbr.h
+++ b/ospf6d/ospf6_asbr.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2001 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_ASBR_H
diff --git a/ospf6d/ospf6_auth_trailer.c b/ospf6d/ospf6_auth_trailer.c
index e54f6784e..68817b5d0 100644
--- a/ospf6d/ospf6_auth_trailer.c
+++ b/ospf6d/ospf6_auth_trailer.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2021 Abhinay Ramesh
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/ospf6d/ospf6_auth_trailer.h b/ospf6d/ospf6_auth_trailer.h
index dea4a6e16..924b89503 100644
--- a/ospf6d/ospf6_auth_trailer.h
+++ b/ospf6d/ospf6_auth_trailer.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2021 Abhinay Ramesh
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __OSPF6_AUTH_TRAILER_H__
diff --git a/ospf6d/ospf6_bfd.c b/ospf6d/ospf6_bfd.c
index c124f17e3..6cc9c3013 100644
--- a/ospf6d/ospf6_bfd.c
+++ b/ospf6d/ospf6_bfd.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * ospf6_bfd.c: IPv6 OSPF BFD handling routines
  *
  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_bfd.h b/ospf6d/ospf6_bfd.h
index 651ce2a6e..e532cccf0 100644
--- a/ospf6d/ospf6_bfd.h
+++ b/ospf6d/ospf6_bfd.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * ospf6_bfd.h: OSPF6 BFD definitions and structures
  *
  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "lib/json.h"
 #ifndef OSPF6_BFD_H
diff --git a/ospf6d/ospf6_flood.c b/ospf6d/ospf6_flood.c
index bc9e2c340..2d2069566 100644
--- a/ospf6d/ospf6_flood.c
+++ b/ospf6d/ospf6_flood.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_flood.h b/ospf6d/ospf6_flood.h
index 75f3c065b..33c2c757b 100644
--- a/ospf6d/ospf6_flood.h
+++ b/ospf6d/ospf6_flood.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_FLOOD_H
diff --git a/ospf6d/ospf6_gr.c b/ospf6d/ospf6_gr.c
index 1f7fefa04..c182e48f2 100644
--- a/ospf6d/ospf6_gr.c
+++ b/ospf6d/ospf6_gr.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of RFC 5187 Graceful Restart.
  *
  * Copyright 2021 NetDEF (c), All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_gr.h b/ospf6d/ospf6_gr.h
index 28798d871..2c7e8b341 100644
--- a/ospf6d/ospf6_gr.h
+++ b/ospf6d/ospf6_gr.h
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF6 Graceful Retsart helper functions.
  *
  * Copyright (C) 2021-22 Vmware, Inc.
  * Rajesh Kumar Girada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_GR_H
diff --git a/ospf6d/ospf6_gr_helper.c b/ospf6d/ospf6_gr_helper.c
index 661d37e63..65ce078fc 100644
--- a/ospf6d/ospf6_gr_helper.c
+++ b/ospf6d/ospf6_gr_helper.c
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF6 Graceful Restart helper functions.
  *
  * Copyright (C) 2021-22 Vmware, Inc.
  * Rajesh Kumar Girada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_interface.c b/ospf6d/ospf6_interface.c
index d3dd5501a..7a22fdf06 100644
--- a/ospf6d/ospf6_interface.c
+++ b/ospf6d/ospf6_interface.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_interface.h b/ospf6d/ospf6_interface.h
index 9a57a7f4d..e04842a7c 100644
--- a/ospf6d/ospf6_interface.h
+++ b/ospf6d/ospf6_interface.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_INTERFACE_H
diff --git a/ospf6d/ospf6_intra.c b/ospf6d/ospf6_intra.c
index 52bb745d7..e7ce2f5f7 100644
--- a/ospf6d/ospf6_intra.c
+++ b/ospf6d/ospf6_intra.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_intra.h b/ospf6d/ospf6_intra.h
index 73cc77a56..79b5eb0ed 100644
--- a/ospf6d/ospf6_intra.h
+++ b/ospf6d/ospf6_intra.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_INTRA_H
diff --git a/ospf6d/ospf6_lsa.c b/ospf6d/ospf6_lsa.c
index cd918d747..fe085b4cb 100644
--- a/ospf6d/ospf6_lsa.c
+++ b/ospf6d/ospf6_lsa.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_lsa.h b/ospf6d/ospf6_lsa.h
index fea9aba27..acb24d791 100644
--- a/ospf6d/ospf6_lsa.h
+++ b/ospf6d/ospf6_lsa.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_LSA_H
diff --git a/ospf6d/ospf6_lsdb.c b/ospf6d/ospf6_lsdb.c
index 7a4c49a15..0221102b5 100644
--- a/ospf6d/ospf6_lsdb.c
+++ b/ospf6d/ospf6_lsdb.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_lsdb.h b/ospf6d/ospf6_lsdb.h
index a3a4d5bb9..7e20b0544 100644
--- a/ospf6d/ospf6_lsdb.h
+++ b/ospf6d/ospf6_lsdb.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_LSDB_H
diff --git a/ospf6d/ospf6_main.c b/ospf6d/ospf6_main.c
index 120f307ad..abc460249 100644
--- a/ospf6d/ospf6_main.c
+++ b/ospf6d/ospf6_main.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 1999 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_message.c b/ospf6d/ospf6_message.c
index 3d29a65d1..b7f261fcf 100644
--- a/ospf6d/ospf6_message.c
+++ b/ospf6d/ospf6_message.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_message.h b/ospf6d/ospf6_message.h
index daab98640..1f6a7e86e 100644
--- a/ospf6d/ospf6_message.h
+++ b/ospf6d/ospf6_message.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 1999-2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_MESSAGE_H
diff --git a/ospf6d/ospf6_neighbor.c b/ospf6d/ospf6_neighbor.c
index a4ba1fb56..85002962c 100644
--- a/ospf6d/ospf6_neighbor.c
+++ b/ospf6d/ospf6_neighbor.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_neighbor.h b/ospf6d/ospf6_neighbor.h
index ea4d42415..d9abd1ff9 100644
--- a/ospf6d/ospf6_neighbor.h
+++ b/ospf6d/ospf6_neighbor.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_NEIGHBOR_H
diff --git a/ospf6d/ospf6_network.c b/ospf6d/ospf6_network.c
index 9a549e2fc..eddf8778e 100644
--- a/ospf6d/ospf6_network.c
+++ b/ospf6d/ospf6_network.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_network.h b/ospf6d/ospf6_network.h
index 3886a0d26..c5627212f 100644
--- a/ospf6d/ospf6_network.h
+++ b/ospf6d/ospf6_network.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_NETWORK_H
diff --git a/ospf6d/ospf6_nssa.c b/ospf6d/ospf6_nssa.c
index 292104683..d62a3a632 100644
--- a/ospf6d/ospf6_nssa.c
+++ b/ospf6d/ospf6_nssa.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPFv3 Not So Stubby Area implementation.
  *
  * Copyright (C) 2021 Kaushik Nath
  * Copyright (C) 2021 Soman K.S
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_nssa.h b/ospf6d/ospf6_nssa.h
index 3cc45d900..a6bafe5ab 100644
--- a/ospf6d/ospf6_nssa.h
+++ b/ospf6d/ospf6_nssa.h
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPFv3 Not So Stubby Area implementation.
  *
  * Copyright (C) 2021 Kaushik Nath
  * Copyright (C) 2021 Soman K.S
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #ifndef OSPF6_NSSA_H
diff --git a/ospf6d/ospf6_proto.c b/ospf6d/ospf6_proto.c
index 4d0c4ee59..09b7b2128 100644
--- a/ospf6d/ospf6_proto.c
+++ b/ospf6d/ospf6_proto.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_proto.h b/ospf6d/ospf6_proto.h
index ea476b3a8..4307ee3c6 100644
--- a/ospf6d/ospf6_proto.h
+++ b/ospf6d/ospf6_proto.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Common protocol data and data structures.
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_PROTO_H
diff --git a/ospf6d/ospf6_route.c b/ospf6d/ospf6_route.c
index 9603c91a9..72dfa240a 100644
--- a/ospf6d/ospf6_route.c
+++ b/ospf6d/ospf6_route.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_route.h b/ospf6d/ospf6_route.h
index 71a84a5c5..2d4fcc930 100644
--- a/ospf6d/ospf6_route.h
+++ b/ospf6d/ospf6_route.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_ROUTE_H
diff --git a/ospf6d/ospf6_routemap_nb.c b/ospf6d/ospf6_routemap_nb.c
index faa992e02..4ccec4fb3 100644
--- a/ospf6d/ospf6_routemap_nb.c
+++ b/ospf6d/ospf6_routemap_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_routemap_nb.h b/ospf6d/ospf6_routemap_nb.h
index 181e71a8c..74c182770 100644
--- a/ospf6d/ospf6_routemap_nb.h
+++ b/ospf6d/ospf6_routemap_nb.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_OSPF6_ROUTEMAP_NB_H_
diff --git a/ospf6d/ospf6_routemap_nb_config.c b/ospf6d/ospf6_routemap_nb_config.c
index cd0a3260d..ad2d57108 100644
--- a/ospf6d/ospf6_routemap_nb_config.c
+++ b/ospf6d/ospf6_routemap_nb_config.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_snmp.c b/ospf6d/ospf6_snmp.c
index 1070474d0..46fa27dd9 100644
--- a/ospf6d/ospf6_snmp.c
+++ b/ospf6d/ospf6_snmp.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* OSPFv3 SNMP support
  * Copyright (C) 2004 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_spf.c b/ospf6d/ospf6_spf.c
index aac371ebb..112934bf1 100644
--- a/ospf6d/ospf6_spf.c
+++ b/ospf6d/ospf6_spf.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* Shortest Path First calculation for OSPFv3 */
diff --git a/ospf6d/ospf6_spf.h b/ospf6d/ospf6_spf.h
index cc52d1686..55ca3ec4f 100644
--- a/ospf6d/ospf6_spf.h
+++ b/ospf6d/ospf6_spf.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_SPF_H
diff --git a/ospf6d/ospf6_top.c b/ospf6d/ospf6_top.c
index 785a48a0a..bd5aedb45 100644
--- a/ospf6d/ospf6_top.c
+++ b/ospf6d/ospf6_top.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_top.h b/ospf6d/ospf6_top.h
index 9dddd465f..08595a69d 100644
--- a/ospf6d/ospf6_top.h
+++ b/ospf6d/ospf6_top.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_TOP_H
diff --git a/ospf6d/ospf6_zebra.c b/ospf6d/ospf6_zebra.c
index f1a4209a8..6fe0a2492 100644
--- a/ospf6d/ospf6_zebra.c
+++ b/ospf6d/ospf6_zebra.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6_zebra.h b/ospf6d/ospf6_zebra.h
index 572bed9f5..eb6d919b3 100644
--- a/ospf6d/ospf6_zebra.h
+++ b/ospf6d/ospf6_zebra.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6_ZEBRA_H
diff --git a/ospf6d/ospf6d.c b/ospf6d/ospf6d.c
index fe742b912..257a0f2b0 100644
--- a/ospf6d/ospf6d.c
+++ b/ospf6d/ospf6d.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospf6d/ospf6d.h b/ospf6d/ospf6d.h
index 43549de74..234a0e881 100644
--- a/ospf6d/ospf6d.h
+++ b/ospf6d/ospf6d.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2003 Yasuhiro Ohara
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef OSPF6D_H
diff --git a/ospfclient/COPYING b/ospfclient/COPYING
deleted file mode 100644
index b8cf3a1ab..000000000
--- a/ospfclient/COPYING
+++ /dev/null
@@ -1,339 +0,0 @@
-		    GNU GENERAL PUBLIC LICENSE
-		       Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.
-                          675 Mass Ave, Cambridge, MA 02139, USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-			    Preamble
-
-  The licenses for most software are designed to take away your
-freedom to share and change it.  By contrast, the GNU General Public
-License is intended to guarantee your freedom to share and change free
-software--to make sure the software is free for all its users.  This
-General Public License applies to most of the Free Software
-Foundation's software and to any other program whose authors commit to
-using it.  (Some other Free Software Foundation software is covered by
-the GNU Library General Public License instead.)  You can apply it to
-your programs, too.
-
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-this service if you wish), that you receive source code or can get it
-if you want it, that you can change the software or use pieces of it
-in new free programs; and that you know you can do these things.
-
-  To protect your rights, we need to make restrictions that forbid
-anyone to deny you these rights or to ask you to surrender the rights.
-These restrictions translate to certain responsibilities for you if you
-distribute copies of the software, or if you modify it.
-
-  For example, if you distribute copies of such a program, whether
-gratis or for a fee, you must give the recipients all the rights that
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-source code.  And you must show them these terms so they know their
-rights.
-
-  We protect your rights with two steps: (1) copyright the software, and
-(2) offer you this license which gives you legal permission to copy,
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-  Also, for each author's protection and ours, we want to make certain
-that everyone understands that there is no warranty for this free
-software.  If the software is modified by someone else and passed on, we
-want its recipients to know that what they have is not the original, so
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-
-		    GNU GENERAL PUBLIC LICENSE
-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
-
-  0. This License applies to any program or other work which contains
-a notice placed by the copyright holder saying it may be distributed
-under the terms of this General Public License.  The "Program", below,
-refers to any such program or work, and a "work based on the Program"
-means either the Program or any derivative work under copyright law:
-that is to say, a work containing the Program or a portion of it,
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-language.  (Hereinafter, translation is included without limitation in
-the term "modification".)  Each licensee is addressed as "you".
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-Activities other than copying, distribution and modification are not
-covered by this License; they are outside its scope.  The act of
-running the Program is not restricted, and the output from the Program
-is covered only if its contents constitute a work based on the
-Program (independent of having been made by running the Program).
-Whether that is true depends on what the Program does.
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-  1. You may copy and distribute verbatim copies of the Program's
-source code as you receive it, in any medium, provided that you
-conspicuously and appropriately publish on each copy an appropriate
-copyright notice and disclaimer of warranty; keep intact all the
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-along with the Program.
-
-You may charge a fee for the physical act of transferring a copy, and
-you may at your option offer warranty protection in exchange for a fee.
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-  2. You may modify your copy or copies of the Program or any portion
-of it, thus forming a work based on the Program, and copy and
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-above, provided that you also meet all of these conditions:
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-    part thereof, to be licensed as a whole at no charge to all third
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-    when run, you must cause it, when started running for such
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-These requirements apply to the modified work as a whole.  If
-identifiable sections of that work are not derived from the Program,
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-this License, whose permissions for other licensees extend to the
-entire whole, and thus to each and every part regardless of who wrote it.
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-exercise the right to control the distribution of derivative or
-collective works based on the Program.
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-In addition, mere aggregation of another work not based on the Program
-with the Program (or with a work based on the Program) on a volume of
-a storage or distribution medium does not bring the other work under
-the scope of this License.
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-  3. You may copy and distribute the Program (or a work based on it,
-under Section 2) in object code or executable form under the terms of
-Sections 1 and 2 above provided that you also do one of the following:
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-    to distribute corresponding source code.  (This alternative is
-    allowed only for noncommercial distribution and only if you
-    received the program in object code or executable form with such
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-  5. You are not required to accept this License, since you have not
-signed it.  However, nothing else grants you permission to modify or
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-prohibited by law if you do not accept this License.  Therefore, by
-modifying or distributing the Program (or any work based on the
-Program), you indicate your acceptance of this License to do so, and
-all its terms and conditions for copying, distributing or modifying
-the Program or works based on it.
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-  6. Each time you redistribute the Program (or any work based on the
-Program), the recipient automatically receives a license from the
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-restrictions on the recipients' exercise of the rights granted herein.
-You are not responsible for enforcing compliance by third parties to
-this License.
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-  7. If, as a consequence of a court judgment or allegation of patent
-infringement or for any other reason (not limited to patent issues),
-conditions are imposed on you (whether by court order, agreement or
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-distribute so as to satisfy simultaneously your obligations under this
-License and any other pertinent obligations, then as a consequence you
-may not distribute the Program at all.  For example, if a patent
-license would not permit royalty-free redistribution of the Program by
-all those who receive copies directly or indirectly through you, then
-the only way you could satisfy both it and this License would be to
-refrain entirely from distribution of the Program.
-
-If any portion of this section is held invalid or unenforceable under
-any particular circumstance, the balance of the section is intended to
-apply and the section as a whole is intended to apply in other
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-implemented by public license practices.  Many people have made
-generous contributions to the wide range of software distributed
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-impose that choice.
-
-This section is intended to make thoroughly clear what is believed to
-be a consequence of the rest of this License.
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-  8. If the distribution and/or use of the Program is restricted in
-certain countries either by patents or by copyrighted interfaces, the
-original copyright holder who places the Program under this License
-may add an explicit geographical distribution limitation excluding
-those countries, so that distribution is permitted only in or among
-countries not thus excluded.  In such case, this License incorporates
-the limitation as if written in the body of this License.
-
-  9. The Free Software Foundation may publish revised and/or new versions
-of the General Public License from time to time.  Such new versions will
-be similar in spirit to the present version, but may differ in detail to
-address new problems or concerns.
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-Each version is given a distinguishing version number.  If the Program
-specifies a version number of this License which applies to it and "any
-later version", you have the option of following the terms and conditions
-either of that version or of any later version published by the Free
-Software Foundation.  If the Program does not specify a version number of
-this License, you may choose any version ever published by the Free Software
-Foundation.
-
-  10. If you wish to incorporate parts of the Program into other free
-programs whose distribution conditions are different, write to the author
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-make exceptions for this.  Our decision will be guided by the two goals
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-of promoting the sharing and reuse of software generally.
-
-			    NO WARRANTY
-
-  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
-FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
-OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
-PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
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-TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
-PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
-REPAIR OR CORRECTION.
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-  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
-REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
-INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
-OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
-TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
-YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
-PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGES.
-
-		     END OF TERMS AND CONDITIONS
-
-	Appendix: How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-convey the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) 19yy  <name of author>
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-Also add information on how to contact you by electronic and paper mail.
-
-If the program is interactive, make it output a short notice like this
-when it starts in an interactive mode:
-
-    Gnomovision version 69, Copyright (C) 19yy name of author
-    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, the commands you use may
-be called something other than `show w' and `show c'; they could even be
-mouse-clicks or menu items--whatever suits your program.
-
-You should also get your employer (if you work as a programmer) or your
-school, if any, to sign a "copyright disclaimer" for the program, if
-necessary.  Here is a sample; alter the names:
-
-  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
-  `Gnomovision' (which makes passes at compilers) written by James Hacker.
-
-  <signature of Ty Coon>, 1 April 1989
-  Ty Coon, President of Vice
-
-This General Public License does not permit incorporating your program into
-proprietary programs.  If your program is a subroutine library, you may
-consider it more useful to permit linking proprietary applications with the
-library.  If this is what you want to do, use the GNU Library General
-Public License instead of this License.
diff --git a/ospfclient/ospf_apiclient.c b/ospfclient/ospf_apiclient.c
index 4982cd885..c5bbc0150 100644
--- a/ospfclient/ospf_apiclient.c
+++ b/ospfclient/ospf_apiclient.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Client side of OSPF API.
  * Copyright (C) 2001, 2002, 2003 Ralph Keller
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfclient/ospf_apiclient.h b/ospfclient/ospf_apiclient.h
index b904937c2..c90b1fb7c 100644
--- a/ospfclient/ospf_apiclient.h
+++ b/ospfclient/ospf_apiclient.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Client side of OSPF API.
  * Copyright (C) 2001, 2002, 2003 Ralph Keller
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _OSPF_APICLIENT_H
diff --git a/ospfclient/ospfclient.c b/ospfclient/ospfclient.c
index edf814184..cbc53ad35 100644
--- a/ospfclient/ospfclient.c
+++ b/ospfclient/ospfclient.c
@@ -1,18 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/ospfclient/ospfclient.py b/ospfclient/ospfclient.py
index 8e3c68445..7a7bfb13c 100755
--- a/ospfclient/ospfclient.py
+++ b/ospfclient/ospfclient.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # December 22 2021, Christian Hopps <chopps@labn.net>
 #
 # Copyright 2021-2022, LabN Consulting, L.L.C.
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-#
 
 import argparse
 import asyncio
diff --git a/ospfd/ospf_abr.c b/ospfd/ospf_abr.c
index 4746b2fc6..55cb8b183 100644
--- a/ospfd/ospf_abr.c
+++ b/ospfd/ospf_abr.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF ABR functions.
  * Copyright (C) 1999, 2000 Alex Zinin, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/ospfd/ospf_abr.h b/ospfd/ospf_abr.h
index c523638fb..21e87669f 100644
--- a/ospfd/ospf_abr.h
+++ b/ospfd/ospf_abr.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF ABR functions.
  * Copyright (C) 1999 Alex Zinin
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_ABR_H
diff --git a/ospfd/ospf_api.c b/ospfd/ospf_api.c
index 9a134d033..3cb1287be 100644
--- a/ospfd/ospf_api.c
+++ b/ospfd/ospf_api.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * API message handling module for OSPF daemon and client.
  * Copyright (C) 2001, 2002 Ralph Keller
  * Copyright (c) 2022, LabN Consulting, L.L.C.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_api.h b/ospfd/ospf_api.h
index fd741c3c4..6c8bed3d8 100644
--- a/ospfd/ospf_api.h
+++ b/ospfd/ospf_api.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * API message handling module for OSPF daemon and client.
  * Copyright (C) 2001, 2002 Ralph Keller
  * Copyright (c) 2022, LabN Consulting, L.L.C.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/ospfd/ospf_apiserver.c b/ospfd/ospf_apiserver.c
index 6fd1c82c2..728945032 100644
--- a/ospfd/ospf_apiserver.c
+++ b/ospfd/ospf_apiserver.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Server side of OSPF API.
  * Copyright (C) 2001, 2002 Ralph Keller
  * Copyright (c) 2022, LabN Consulting, L.L.C.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_apiserver.h b/ospfd/ospf_apiserver.h
index 0a6b7319a..a90d18573 100644
--- a/ospfd/ospf_apiserver.h
+++ b/ospfd/ospf_apiserver.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Server side of OSPF API.
  * Copyright (C) 2001, 2002 Ralph Keller
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _OSPF_APISERVER_H
diff --git a/ospfd/ospf_asbr.c b/ospfd/ospf_asbr.c
index 2d746946a..5b5367811 100644
--- a/ospfd/ospf_asbr.c
+++ b/ospfd/ospf_asbr.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF AS Boundary Router functions.
  * Copyright (C) 1999, 2000 Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_asbr.h b/ospfd/ospf_asbr.h
index f7dbca758..6b427c5fd 100644
--- a/ospfd/ospf_asbr.h
+++ b/ospfd/ospf_asbr.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF AS Boundary Router functions.
  * Copyright (C) 1999, 2000 Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_ASBR_H
diff --git a/ospfd/ospf_ase.c b/ospfd/ospf_ase.c
index 706a22e9b..b43f0cb37 100644
--- a/ospfd/ospf_ase.c
+++ b/ospfd/ospf_ase.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF AS external route calculation.
  * Copyright (C) 1999, 2000 Alex Zinin, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_ase.h b/ospfd/ospf_ase.h
index 195d658c0..d59a470ce 100644
--- a/ospfd/ospf_ase.h
+++ b/ospfd/ospf_ase.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF AS External route calculation.
  * Copyright (C) 1999, 2000 Alex Zinin, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_ASE_H
diff --git a/ospfd/ospf_bfd.c b/ospfd/ospf_bfd.c
index fb117ecfc..0b0016745 100644
--- a/ospfd/ospf_bfd.c
+++ b/ospfd/ospf_bfd.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * ospf_bfd.c: OSPF BFD handling routines
  *
  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_bfd.h b/ospfd/ospf_bfd.h
index 9393c839f..3c4e1e6c5 100644
--- a/ospfd/ospf_bfd.h
+++ b/ospfd/ospf_bfd.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * ospf_bfd.h: OSPF BFD definitions and structures
  *
  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_BFD_H
diff --git a/ospfd/ospf_dump.c b/ospfd/ospf_dump.c
index c1f4b2306..de51500b0 100644
--- a/ospfd/ospf_dump.c
+++ b/ospfd/ospf_dump.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPFd dump routine.
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_dump.h b/ospfd/ospf_dump.h
index 251be7c8d..596d49256 100644
--- a/ospfd/ospf_dump.h
+++ b/ospfd/ospf_dump.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPFd dump routine.
  * Copyright (C) 1999 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_DUMP_H
diff --git a/ospfd/ospf_dump_api.c b/ospfd/ospf_dump_api.c
index 4b68b006e..8400310ca 100644
--- a/ospfd/ospf_dump_api.c
+++ b/ospfd/ospf_dump_api.c
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPFd dump routine (parts used by ospfclient).
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_dump_api.h b/ospfd/ospf_dump_api.h
index 98fef34b1..34da11374 100644
--- a/ospfd/ospf_dump_api.h
+++ b/ospfd/ospf_dump_api.h
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPFd dump routine (parts used by ospfclient).
  * Copyright (C) 1999 Toshiaki Takada
- *
- * This file is part of FRRouting (FRR).
- *
- * FRR is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2, or (at your option) any later version.
- *
- * FRR is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_DUMP_API_H
diff --git a/ospfd/ospf_errors.c b/ospfd/ospf_errors.c
index 2de77a43f..16aa3ab52 100644
--- a/ospfd/ospf_errors.c
+++ b/ospfd/ospf_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *		Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_errors.h b/ospfd/ospf_errors.h
index df5bdaa49..dcf9a65ce 100644
--- a/ospfd/ospf_errors.h
+++ b/ospfd/ospf_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *		Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __OSPF_ERRORS_H__
diff --git a/ospfd/ospf_ext.c b/ospfd/ospf_ext.c
index 1288686a1..5faaed076 100644
--- a/ospfd/ospf_ext.c
+++ b/ospfd/ospf_ext.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of RFC7684 OSPFv2 Prefix/Link Attribute
  * Advertisement
@@ -8,20 +9,6 @@
  * Author: Anselme Sawadogo <anselmesawadogo@gmail.com>
  *
  * Copyright (C) 2016 - 2018 Orange Labs http://www.orange.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_ext.h b/ospfd/ospf_ext.h
index b1e4feb6d..535e548b8 100644
--- a/ospfd/ospf_ext.h
+++ b/ospfd/ospf_ext.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of RFC7684 OSPFv2 Prefix/Link Attribute
  * Advertisement
@@ -8,20 +9,6 @@
  * Author: Anselme Sawadogo <anselmesawadogo@gmail.com>
  *
  * Copyright (C) 2016 - 2018 Orange Labs http://www.orange.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_OSPF_EXT_PREF_H_
diff --git a/ospfd/ospf_flood.c b/ospfd/ospf_flood.c
index 4bbeee2d7..debbcd964 100644
--- a/ospfd/ospf_flood.c
+++ b/ospfd/ospf_flood.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Flooding -- RFC2328 Section 13.
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_flood.h b/ospfd/ospf_flood.h
index 95a5b358c..6dce6937b 100644
--- a/ospfd/ospf_flood.h
+++ b/ospfd/ospf_flood.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Flooding -- RFC2328 Section 13.
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_FLOOD_H
diff --git a/ospfd/ospf_gr.c b/ospfd/ospf_gr.c
index 6678d8c1f..e83ff1dcc 100644
--- a/ospfd/ospf_gr.c
+++ b/ospfd/ospf_gr.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of RFC 3623 Graceful OSPF Restart.
  *
  * Copyright 2021 NetDEF (c), All rights reserved.
  * Copyright 2020 6WIND (c), All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_gr.h b/ospfd/ospf_gr.h
index 496ba3c59..65aa91d42 100644
--- a/ospfd/ospf_gr.h
+++ b/ospfd/ospf_gr.h
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Graceful Restart helper functions.
  *
  * Copyright (C) 2020-21 Vmware, Inc.
  * Rajesh Kumar Girada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_GR_H
diff --git a/ospfd/ospf_gr_helper.c b/ospfd/ospf_gr_helper.c
index 624133ad6..0263df48c 100644
--- a/ospfd/ospf_gr_helper.c
+++ b/ospfd/ospf_gr_helper.c
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Graceful Restart helper functions.
  *
  * Copyright (C) 2020-21 Vmware, Inc.
  * Rajesh Kumar Girada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_ia.c b/ospfd/ospf_ia.c
index f9869a673..d3c9626d9 100644
--- a/ospfd/ospf_ia.c
+++ b/ospfd/ospf_ia.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF inter-area routing.
  * Copyright (C) 1999, 2000 Alex Zinin, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/ospfd/ospf_ia.h b/ospfd/ospf_ia.h
index 05ad13c06..1005f2b86 100644
--- a/ospfd/ospf_ia.h
+++ b/ospfd/ospf_ia.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF inter-area routing.
  * Copyright (C) 1999, 2000 Alex Zinin, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_IA_H
diff --git a/ospfd/ospf_interface.c b/ospfd/ospf_interface.c
index 831906b90..4ea367eca 100644
--- a/ospfd/ospf_interface.c
+++ b/ospfd/ospf_interface.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Interface functions.
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_interface.h b/ospfd/ospf_interface.h
index 51fc1bf3c..0ee0cd4a3 100644
--- a/ospfd/ospf_interface.h
+++ b/ospfd/ospf_interface.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Interface functions.
  * Copyright (C) 1999 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_INTERFACE_H
diff --git a/ospfd/ospf_ism.c b/ospfd/ospf_ism.c
index d4565b665..173ebdf20 100644
--- a/ospfd/ospf_ism.c
+++ b/ospfd/ospf_ism.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF version 2  Interface State Machine
  *   From RFC2328 [OSPF Version 2]
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_ism.h b/ospfd/ospf_ism.h
index 92329bc55..d0516f61a 100644
--- a/ospfd/ospf_ism.h
+++ b/ospfd/ospf_ism.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF version 2  Interface State Machine.
  *   From RFC2328 [OSPF Version 2]
  * Copyright (C) 1999 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_ISM_H
diff --git a/ospfd/ospf_ldp_sync.c b/ospfd/ospf_ldp_sync.c
index 51cd2a127..d3da5003a 100644
--- a/ospfd/ospf_ldp_sync.c
+++ b/ospfd/ospf_ldp_sync.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ospf_ldp_sync.c: OSPF LDP-IGP Sync  handling routines
  * Copyright (C) 2020 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_ldp_sync.h b/ospfd/ospf_ldp_sync.h
index 63f370724..88fdcbaf4 100644
--- a/ospfd/ospf_ldp_sync.h
+++ b/ospfd/ospf_ldp_sync.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ospf_ldp_sync.h: OSPF LDP-IGP Sync  handling routines
  * Copyright (C) 2020 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_LDP_SYNC_H
diff --git a/ospfd/ospf_lsa.c b/ospfd/ospf_lsa.c
index 3e8b7b283..ffbfc2af2 100644
--- a/ospfd/ospf_lsa.c
+++ b/ospfd/ospf_lsa.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Link State Advertisement
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_lsa.h b/ospfd/ospf_lsa.h
index 1caf8047e..6fa6399a9 100644
--- a/ospfd/ospf_lsa.h
+++ b/ospfd/ospf_lsa.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Link State Advertisement
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_LSA_H
diff --git a/ospfd/ospf_lsdb.c b/ospfd/ospf_lsdb.c
index f4fb858a5..0d18e9f77 100644
--- a/ospfd/ospf_lsdb.c
+++ b/ospfd/ospf_lsdb.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF LSDB support.
  * Copyright (C) 1999, 2000 Alex Zinin, Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_lsdb.h b/ospfd/ospf_lsdb.h
index 5cf5d0544..bf295ca83 100644
--- a/ospfd/ospf_lsdb.h
+++ b/ospfd/ospf_lsdb.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF LSDB support.
  * Copyright (C) 1999, 2000 Alex Zinin, Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_LSDB_H
diff --git a/ospfd/ospf_main.c b/ospfd/ospf_main.c
index 2f9787bca..05fc5c95d 100644
--- a/ospfd/ospf_main.c
+++ b/ospfd/ospf_main.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPFd main routine.
  *   Copyright (C) 1998, 99 Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_memory.c b/ospfd/ospf_memory.c
index 283844389..9854c8cae 100644
--- a/ospfd/ospf_memory.c
+++ b/ospfd/ospf_memory.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* ospfd memory type definitions
  *
  * Copyright (C) 2015  David Lamparter
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/ospfd/ospf_memory.h b/ospfd/ospf_memory.h
index 9bd0a844a..d11b69abb 100644
--- a/ospfd/ospf_memory.h
+++ b/ospfd/ospf_memory.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* ospfd memory type declarations
  *
  * Copyright (C) 2015  David Lamparter
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_OSPF_MEMORY_H
diff --git a/ospfd/ospf_neighbor.c b/ospfd/ospf_neighbor.c
index 02c44dcdc..8338c4307 100644
--- a/ospfd/ospf_neighbor.c
+++ b/ospfd/ospf_neighbor.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Neighbor functions.
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_neighbor.h b/ospfd/ospf_neighbor.h
index 433b13615..7bd5b1209 100644
--- a/ospfd/ospf_neighbor.h
+++ b/ospfd/ospf_neighbor.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Neighbor functions.
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_NEIGHBOR_H
diff --git a/ospfd/ospf_network.c b/ospfd/ospf_network.c
index a8c9493ec..e89ad020b 100644
--- a/ospfd/ospf_network.c
+++ b/ospfd/ospf_network.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF network related functions
  *   Copyright (C) 1999 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_network.h b/ospfd/ospf_network.h
index cbaf13232..33fd8980b 100644
--- a/ospfd/ospf_network.h
+++ b/ospfd/ospf_network.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF network related functions.
  *   Copyright (C) 1999 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_NETWORK_H
diff --git a/ospfd/ospf_nsm.c b/ospfd/ospf_nsm.c
index a27550853..65c772048 100644
--- a/ospfd/ospf_nsm.c
+++ b/ospfd/ospf_nsm.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF version 2  Neighbor State Machine
  * From RFC2328 [OSPF Version 2]
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_nsm.h b/ospfd/ospf_nsm.h
index c526c4c3e..b53a05914 100644
--- a/ospfd/ospf_nsm.h
+++ b/ospfd/ospf_nsm.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF version 2  Neighbor State Machine
  *   From RFC2328 [OSPF Version 2]
  *   Copyright (C) 1999 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_NSM_H
diff --git a/ospfd/ospf_opaque.c b/ospfd/ospf_opaque.c
index ab647625f..2af5d09ed 100644
--- a/ospfd/ospf_opaque.c
+++ b/ospfd/ospf_opaque.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of rfc2370.
  * Copyright (C) 2001 KDD R&D Laboratories, Inc.
  * http://www.kddlabs.co.jp/
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_opaque.h b/ospfd/ospf_opaque.h
index 05fe6deac..e0c78cd6d 100644
--- a/ospfd/ospf_opaque.h
+++ b/ospfd/ospf_opaque.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of rfc2370.
  * Copyright (C) 2001 KDD R&D Laboratories, Inc.
  * http://www.kddlabs.co.jp/
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_OPAQUE_H
diff --git a/ospfd/ospf_packet.c b/ospfd/ospf_packet.c
index b22fe5d99..4c2f5d72b 100644
--- a/ospfd/ospf_packet.c
+++ b/ospfd/ospf_packet.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Sending and Receiving OSPF Packets.
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_packet.h b/ospfd/ospf_packet.h
index cefc9c21b..e8b279b9d 100644
--- a/ospfd/ospf_packet.h
+++ b/ospfd/ospf_packet.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF Sending and Receiving OSPF Packets.
  * Copyright (C) 1999 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_PACKET_H
diff --git a/ospfd/ospf_ri.c b/ospfd/ospf_ri.c
index e227a3151..a808ddc9f 100644
--- a/ospfd/ospf_ri.c
+++ b/ospfd/ospf_ri.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of RFC4970 Router Information
  * with support of RFC5088 PCE Capabilites announcement
@@ -5,22 +6,6 @@
  * Module name: Router Information
  * Author: Olivier Dugeon <olivier.dugeon@orange.com>
  * Copyright (C) 2012 - 2017 Orange Labs http://www.orange.com/
- *
- * This file is part of GNU Quagga.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_ri.h b/ospfd/ospf_ri.h
index bbad89628..0870938cf 100644
--- a/ospfd/ospf_ri.h
+++ b/ospfd/ospf_ri.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of RFC4970 Router Information
  * with support of RFC5088 PCE Capabilites announcement
@@ -8,22 +9,6 @@
  * Module name: Router Information
  * Author: Olivier Dugeon <olivier.dugeon@orange.com>
  * Copyright (C) 2012 - 2017 Orange Labs http://www.orange.com/
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_ROUTER_INFO_H
diff --git a/ospfd/ospf_route.c b/ospfd/ospf_route.c
index 6360d8ec6..bcedd36ce 100644
--- a/ospfd/ospf_route.c
+++ b/ospfd/ospf_route.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF routing table.
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_route.h b/ospfd/ospf_route.h
index fa9478fce..2582067ae 100644
--- a/ospfd/ospf_route.h
+++ b/ospfd/ospf_route.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF routing table.
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_ROUTE_H
diff --git a/ospfd/ospf_routemap.c b/ospfd/ospf_routemap.c
index 63460c773..308700881 100644
--- a/ospfd/ospf_routemap.c
+++ b/ospfd/ospf_routemap.c
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Route map function of ospfd.
  * Copyright (C) 2000 IP Infusion Inc.
  *
  * Written by Toshiaki Takada.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_routemap_nb.c b/ospfd/ospf_routemap_nb.c
index e53d009a5..8ccd0e56a 100644
--- a/ospfd/ospf_routemap_nb.c
+++ b/ospfd/ospf_routemap_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_routemap_nb.h b/ospfd/ospf_routemap_nb.h
index 17bcb4f5c..5bba784eb 100644
--- a/ospfd/ospf_routemap_nb.h
+++ b/ospfd/ospf_routemap_nb.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_OSPF_ROUTEMAP_NB_H_
diff --git a/ospfd/ospf_routemap_nb_config.c b/ospfd/ospf_routemap_nb_config.c
index 902679542..a35a1ef6f 100644
--- a/ospfd/ospf_routemap_nb_config.c
+++ b/ospfd/ospf_routemap_nb_config.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_snmp.c b/ospfd/ospf_snmp.c
index f1b876cfb..fb9f36349 100644
--- a/ospfd/ospf_snmp.c
+++ b/ospfd/ospf_snmp.c
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* OSPFv2 SNMP support
  * Copyright (C) 2005 6WIND <alain.ritoux@6wind.com>
  * Copyright (C) 2000 IP Infusion Inc.
  *
  * Written by Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_spf.c b/ospfd/ospf_spf.c
index d5f957c28..7c1f9f17a 100644
--- a/ospfd/ospf_spf.c
+++ b/ospfd/ospf_spf.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* OSPF SPF calculation.
  * Copyright (C) 1999, 2000 Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_spf.h b/ospfd/ospf_spf.h
index 834bfd0bb..0837748d0 100644
--- a/ospfd/ospf_spf.h
+++ b/ospfd/ospf_spf.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF calculation.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_OSPF_SPF_H
diff --git a/ospfd/ospf_sr.c b/ospfd/ospf_sr.c
index 3a71e5571..adb14ec6b 100644
--- a/ospfd/ospf_sr.c
+++ b/ospfd/ospf_sr.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of Segment Routing
  * as per RFC 8665 - OSPF Extensions for Segment Routing
@@ -9,20 +10,6 @@
  * Author: Anselme Sawadogo <anselmesawadogo@gmail.com>
  *
  * Copyright (C) 2016 - 2020 Orange Labs http://www.orange.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/ospfd/ospf_sr.h b/ospfd/ospf_sr.h
index b153a220f..2c189083b 100644
--- a/ospfd/ospf_sr.h
+++ b/ospfd/ospf_sr.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of Segment Routing
  * as per RFC 8665 - OSPF Extensions for Segment Routing
@@ -9,20 +10,6 @@
  * Author: Anselme Sawadogo <anselmesawadogo@gmail.com>
  *
  * Copyright (C) 2016 - 2020 Orange Labs http://www.orange.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_OSPF_SR_H
diff --git a/ospfd/ospf_te.c b/ospfd/ospf_te.c
index 75f4e0c9f..e3869abe5 100644
--- a/ospfd/ospf_te.c
+++ b/ospfd/ospf_te.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of RFC3630
  * Copyright (C) 2001 KDD R&D Laboratories, Inc.
@@ -5,22 +6,6 @@
  *
  * Copyright (C) 2012 Orange Labs
  * http://www.orange.com
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* Add support of RFC7471 */
diff --git a/ospfd/ospf_te.h b/ospfd/ospf_te.h
index fc9ca2078..49906ef71 100644
--- a/ospfd/ospf_te.h
+++ b/ospfd/ospf_te.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of RFC3630, RFC5392 & RFC6827
  * Copyright (C) 2001 KDD R&D Laboratories, Inc.
@@ -5,22 +6,6 @@
  *
  * Copyright (C) 2012 Orange Labs
  * http://www.orange.com
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* Add support of RFC7471 */
diff --git a/ospfd/ospf_ti_lfa.c b/ospfd/ospf_ti_lfa.c
index 76f61f783..b14200868 100644
--- a/ospfd/ospf_ti_lfa.c
+++ b/ospfd/ospf_ti_lfa.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF TI-LFA
  * Copyright (C) 2020  NetDEF, Inc.
  *                     Sascha Kattelmann
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_ti_lfa.h b/ospfd/ospf_ti_lfa.h
index bc8f19b98..ea37da6a3 100644
--- a/ospfd/ospf_ti_lfa.h
+++ b/ospfd/ospf_ti_lfa.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPF calculation.
  * Copyright (C) 2020  NetDEF, Inc.
  *                     Sascha Kattelmann
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _OSPF_TI_LFA_H
diff --git a/ospfd/ospf_vty.c b/ospfd/ospf_vty.c
index 469e9955e..b3e543d22 100644
--- a/ospfd/ospf_vty.c
+++ b/ospfd/ospf_vty.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* OSPF VTY interface.
  * Copyright (C) 2005 6WIND <alain.ritoux@6wind.com>
  * Copyright (C) 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_vty.h b/ospfd/ospf_vty.h
index bf9c97171..e9402469e 100644
--- a/ospfd/ospf_vty.h
+++ b/ospfd/ospf_vty.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* OSPF VTY interface.
  * Copyright (C) 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_OSPF_VTY_H
diff --git a/ospfd/ospf_zebra.c b/ospfd/ospf_zebra.c
index 1754512b5..46fb653f3 100644
--- a/ospfd/ospf_zebra.c
+++ b/ospfd/ospf_zebra.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra connect library for OSPFd
  * Copyright (C) 1997, 98, 99, 2000 Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospf_zebra.h b/ospfd/ospf_zebra.h
index 3bd8a7680..adc338fb1 100644
--- a/ospfd/ospf_zebra.h
+++ b/ospfd/ospf_zebra.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra connect library for OSPFd
  * Copyright (C) 1997, 98, 99, 2000 Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPF_ZEBRA_H
diff --git a/ospfd/ospfd.c b/ospfd/ospfd.c
index 023dc32a7..1c8ebccea 100644
--- a/ospfd/ospfd.c
+++ b/ospfd/ospfd.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* OSPF version 2 daemon program.
  * Copyright (C) 1999, 2000 Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ospfd/ospfd.h b/ospfd/ospfd.h
index 3a43010f8..cb26ef5fb 100644
--- a/ospfd/ospfd.h
+++ b/ospfd/ospfd.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OSPFd main header.
  * Copyright (C) 1998, 99, 2000 Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_OSPFD_H
diff --git a/pathd/path_cli.c b/pathd/path_cli.c
index 66680357d..45f4ac7ab 100644
--- a/pathd/path_cli.c
+++ b/pathd/path_cli.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_debug.c b/pathd/path_debug.c
index eec570739..cae212d9c 100644
--- a/pathd/path_debug.c
+++ b/pathd/path_debug.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_debug.h b/pathd/path_debug.h
index d9cfcb6ba..12a21cbb0 100644
--- a/pathd/path_debug.h
+++ b/pathd/path_debug.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _PATH_DEBUG_H_
diff --git a/pathd/path_errors.c b/pathd/path_errors.c
index 68372c29b..53187fde2 100644
--- a/pathd/path_errors.c
+++ b/pathd/path_errors.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * pathd-specific error messages.
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_errors.h b/pathd/path_errors.h
index 5d05b6650..69dd023d0 100644
--- a/pathd/path_errors.h
+++ b/pathd/path_errors.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __PATH_ERRORS_H__
diff --git a/pathd/path_main.c b/pathd/path_main.c
index 0a71c80ef..3d35b9f9b 100644
--- a/pathd/path_main.c
+++ b/pathd/path_main.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pathd/path_nb.c b/pathd/path_nb.c
index 137e64d12..9e919571d 100644
--- a/pathd/path_nb.c
+++ b/pathd/path_nb.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_nb.h b/pathd/path_nb.h
index dacc5eb0d..21876d788 100644
--- a/pathd/path_nb.h
+++ b/pathd/path_nb.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_PATH_NB_H_
diff --git a/pathd/path_nb_config.c b/pathd/path_nb_config.c
index 25d2ef47f..ad24f23dd 100644
--- a/pathd/path_nb_config.c
+++ b/pathd/path_nb_config.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_nb_state.c b/pathd/path_nb_state.c
index 60f04f45c..35b9e37c7 100644
--- a/pathd/path_nb_state.c
+++ b/pathd/path_nb_state.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_pcep.c b/pathd/path_pcep.c
index 8a7825907..0c5e49504 100644
--- a/pathd/path_pcep.c
+++ b/pathd/path_pcep.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_pcep.h b/pathd/path_pcep.h
index 597a4b6c8..6f92d7636 100644
--- a/pathd/path_pcep.h
+++ b/pathd/path_pcep.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _PATH_PCEP_H_
diff --git a/pathd/path_pcep_cli.c b/pathd/path_pcep_cli.c
index 0f259f1dc..6c660a3d0 100644
--- a/pathd/path_pcep_cli.c
+++ b/pathd/path_pcep_cli.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020 Volta Networks, Inc
  *                     Brady Johnson
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_pcep_cli.h b/pathd/path_pcep_cli.h
index 0b101ab21..a6fd858e8 100644
--- a/pathd/path_pcep_cli.h
+++ b/pathd/path_pcep_cli.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020 Volta Networks, Inc
  *                     Brady Johnson
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _PATH_PCEP_CLI_H_
diff --git a/pathd/path_pcep_config.c b/pathd/path_pcep_config.c
index e2feabb03..21d127bcf 100644
--- a/pathd/path_pcep_config.c
+++ b/pathd/path_pcep_config.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_pcep_config.h b/pathd/path_pcep_config.h
index e56d497aa..e933728c7 100644
--- a/pathd/path_pcep_config.h
+++ b/pathd/path_pcep_config.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _PATH_PCEP_CONFIG_H_
diff --git a/pathd/path_pcep_controller.c b/pathd/path_pcep_controller.c
index 84b74aed8..405749b50 100644
--- a/pathd/path_pcep_controller.c
+++ b/pathd/path_pcep_controller.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_pcep_controller.h b/pathd/path_pcep_controller.h
index bc7ed4910..c2359beb2 100644
--- a/pathd/path_pcep_controller.h
+++ b/pathd/path_pcep_controller.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _PATH_PCEP_CONTROLLER_H_
diff --git a/pathd/path_pcep_debug.c b/pathd/path_pcep_debug.c
index 4ae587c91..7d04587b8 100644
--- a/pathd/path_pcep_debug.c
+++ b/pathd/path_pcep_debug.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_pcep_debug.h b/pathd/path_pcep_debug.h
index bc78c21d4..cc63ca0f9 100644
--- a/pathd/path_pcep_debug.h
+++ b/pathd/path_pcep_debug.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _PATH_PCEP_DEBUG_H_
diff --git a/pathd/path_pcep_lib.c b/pathd/path_pcep_lib.c
index 1ce01a162..502f2336c 100644
--- a/pathd/path_pcep_lib.c
+++ b/pathd/path_pcep_lib.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_pcep_lib.h b/pathd/path_pcep_lib.h
index 524f385d1..6bba344ba 100644
--- a/pathd/path_pcep_lib.h
+++ b/pathd/path_pcep_lib.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _PATH_PCEP_LIB_H_
diff --git a/pathd/path_pcep_pcc.c b/pathd/path_pcep_pcc.c
index 6ad5d6caf..0ff0b4403 100644
--- a/pathd/path_pcep_pcc.c
+++ b/pathd/path_pcep_pcc.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* TODOS AND KNOWN ISSUES:
diff --git a/pathd/path_pcep_pcc.h b/pathd/path_pcep_pcc.h
index 9e712baf1..039d67d2e 100644
--- a/pathd/path_pcep_pcc.h
+++ b/pathd/path_pcep_pcc.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _PATH_PCEP_PCC_H_
diff --git a/pathd/path_ted.c b/pathd/path_ted.c
index 5be63a68c..bc0da969e 100644
--- a/pathd/path_ted.c
+++ b/pathd/path_ted.c
@@ -1,16 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020 Volta Networks, Inc
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
  * You should have received a copy of the GNU Lesser General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
diff --git a/pathd/path_ted.h b/pathd/path_ted.h
index 5a0c8eecd..10cdd545f 100644
--- a/pathd/path_ted.h
+++ b/pathd/path_ted.h
@@ -1,16 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020 Volta Networks, Inc
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
  * You should have received a copy of the GNU Lesser General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
diff --git a/pathd/path_zebra.c b/pathd/path_zebra.c
index a98532cc3..efc016f75 100644
--- a/pathd/path_zebra.c
+++ b/pathd/path_zebra.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/path_zebra.h b/pathd/path_zebra.h
index 683fcf10f..0d435bb51 100644
--- a/pathd/path_zebra.h
+++ b/pathd/path_zebra.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_PATH_MPLS_H_
diff --git a/pathd/pathd.c b/pathd/pathd.c
index 2ca4f4cc9..86501f7ad 100644
--- a/pathd/pathd.c
+++ b/pathd/pathd.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pathd/pathd.h b/pathd/pathd.h
index bb2e63c04..f1a59b116 100644
--- a/pathd/pathd.h
+++ b/pathd/pathd.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_PATHD_H_
diff --git a/pbrd/pbr_debug.c b/pbrd/pbr_debug.c
index 99489777e..b30b54b7f 100644
--- a/pbrd/pbr_debug.c
+++ b/pbrd/pbr_debug.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PBR - debugging
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pbrd/pbr_debug.h b/pbrd/pbr_debug.h
index e72fb88be..09109971d 100644
--- a/pbrd/pbr_debug.h
+++ b/pbrd/pbr_debug.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PBR - debugging
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __PBR_DEBUG_H__
 #define __PBR_DEBUG_H__
diff --git a/pbrd/pbr_main.c b/pbrd/pbr_main.c
index 28a7b62d1..9b34815c4 100644
--- a/pbrd/pbr_main.c
+++ b/pbrd/pbr_main.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PBR - main code
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pbrd/pbr_map.c b/pbrd/pbr_map.c
index 5daac55de..0e18f1198 100644
--- a/pbrd/pbr_map.c
+++ b/pbrd/pbr_map.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PBR-map Code
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pbrd/pbr_map.h b/pbrd/pbr_map.h
index 3527523fc..c9da431b3 100644
--- a/pbrd/pbr_map.h
+++ b/pbrd/pbr_map.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PBR-map Header
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __PBR_MAP_H__
 #define __PBR_MAP_H__
diff --git a/pbrd/pbr_memory.c b/pbrd/pbr_memory.c
index 5531d4193..0e93eccf4 100644
--- a/pbrd/pbr_memory.c
+++ b/pbrd/pbr_memory.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PBR memory code.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pbrd/pbr_memory.h b/pbrd/pbr_memory.h
index eb13d5d9d..29a09db96 100644
--- a/pbrd/pbr_memory.h
+++ b/pbrd/pbr_memory.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * pbr memory code.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __PBR_MEMORY_H__
 
diff --git a/pbrd/pbr_nht.c b/pbrd/pbr_nht.c
index b48670d5b..405a2d658 100644
--- a/pbrd/pbr_nht.c
+++ b/pbrd/pbr_nht.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PBR-nht Code
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pbrd/pbr_nht.h b/pbrd/pbr_nht.h
index 900b7627f..9b67492fb 100644
--- a/pbrd/pbr_nht.h
+++ b/pbrd/pbr_nht.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PBR-nht Header
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __PBR_NHT_H__
 #define __PBR_NHT_H__
diff --git a/pbrd/pbr_vrf.c b/pbrd/pbr_vrf.c
index 277269a98..ef4a4c2c6 100644
--- a/pbrd/pbr_vrf.c
+++ b/pbrd/pbr_vrf.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PBR - vrf code
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *               Stephen Worley
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pbrd/pbr_vrf.h b/pbrd/pbr_vrf.h
index e37bcd42b..c8c7c5763 100644
--- a/pbrd/pbr_vrf.h
+++ b/pbrd/pbr_vrf.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRF library for PBR
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *               Stephen Worley
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __PBR_VRF_H__
 #define __PBR_VRF_H__
diff --git a/pbrd/pbr_vty.c b/pbrd/pbr_vty.c
index d9019c709..bb09a10b9 100644
--- a/pbrd/pbr_vty.c
+++ b/pbrd/pbr_vty.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PBR - vty code
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pbrd/pbr_vty.h b/pbrd/pbr_vty.h
index 6e345fd7e..9158d8d5b 100644
--- a/pbrd/pbr_vty.h
+++ b/pbrd/pbr_vty.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VTY library for PBR
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __PBR_VTY_H__
 #define __PBR_VTY_H__
diff --git a/pbrd/pbr_zebra.c b/pbrd/pbr_zebra.c
index 4506dc1af..1b18853d2 100644
--- a/pbrd/pbr_zebra.c
+++ b/pbrd/pbr_zebra.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra connect code.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pbrd/pbr_zebra.h b/pbrd/pbr_zebra.h
index d0f9ff910..850e5f06d 100644
--- a/pbrd/pbr_zebra.h
+++ b/pbrd/pbr_zebra.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra connect library for PBR
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __PBR_ZEBRA_H__
 #define __PBR_ZEBRA_H__
diff --git a/pceplib/pcep.h b/pceplib/pcep.h
index b5d02c7e6..cb7019dac 100644
--- a/pceplib/pcep.h
+++ b/pceplib/pcep.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_msg_encoding.h b/pceplib/pcep_msg_encoding.h
index d835b87f9..9a1a66062 100644
--- a/pceplib/pcep_msg_encoding.h
+++ b/pceplib/pcep_msg_encoding.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_msg_messages.c b/pceplib/pcep_msg_messages.c
index 5a244098d..eb0f679a1 100644
--- a/pceplib/pcep_msg_messages.c
+++ b/pceplib/pcep_msg_messages.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_msg_messages.h b/pceplib/pcep_msg_messages.h
index 8542ea10e..8876e0d75 100644
--- a/pceplib/pcep_msg_messages.h
+++ b/pceplib/pcep_msg_messages.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  */
 
diff --git a/pceplib/pcep_msg_messages_encoding.c b/pceplib/pcep_msg_messages_encoding.c
index 2d27e4040..1b9f1c468 100644
--- a/pceplib/pcep_msg_messages_encoding.c
+++ b/pceplib/pcep_msg_messages_encoding.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_msg_object_error_types.c b/pceplib/pcep_msg_object_error_types.c
index c72dfd706..f42eaa4cb 100644
--- a/pceplib/pcep_msg_object_error_types.c
+++ b/pceplib/pcep_msg_object_error_types.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  */
 
diff --git a/pceplib/pcep_msg_object_error_types.h b/pceplib/pcep_msg_object_error_types.h
index d62cc7e27..68e8b1a8f 100644
--- a/pceplib/pcep_msg_object_error_types.h
+++ b/pceplib/pcep_msg_object_error_types.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  */
 
diff --git a/pceplib/pcep_msg_objects.c b/pceplib/pcep_msg_objects.c
index ce41ee953..e7af6b3bc 100644
--- a/pceplib/pcep_msg_objects.c
+++ b/pceplib/pcep_msg_objects.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_msg_objects.h b/pceplib/pcep_msg_objects.h
index 6d7d3be7e..42a8bbf7b 100644
--- a/pceplib/pcep_msg_objects.h
+++ b/pceplib/pcep_msg_objects.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  */
 
diff --git a/pceplib/pcep_msg_objects_encoding.c b/pceplib/pcep_msg_objects_encoding.c
index 560060436..2747678f8 100644
--- a/pceplib/pcep_msg_objects_encoding.c
+++ b/pceplib/pcep_msg_objects_encoding.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_msg_tlvs.c b/pceplib/pcep_msg_tlvs.c
index 6298ed4b8..86a7db6dd 100644
--- a/pceplib/pcep_msg_tlvs.c
+++ b/pceplib/pcep_msg_tlvs.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_msg_tlvs.h b/pceplib/pcep_msg_tlvs.h
index 6dd2b5655..61f446f03 100644
--- a/pceplib/pcep_msg_tlvs.h
+++ b/pceplib/pcep_msg_tlvs.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  */
 
diff --git a/pceplib/pcep_msg_tlvs_encoding.c b/pceplib/pcep_msg_tlvs_encoding.c
index b5a65d457..08a4302c2 100644
--- a/pceplib/pcep_msg_tlvs_encoding.c
+++ b/pceplib/pcep_msg_tlvs_encoding.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_msg_tools.c b/pceplib/pcep_msg_tools.c
index ca6a3ab0c..fe161f070 100644
--- a/pceplib/pcep_msg_tools.c
+++ b/pceplib/pcep_msg_tools.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_msg_tools.h b/pceplib/pcep_msg_tools.h
index b62bdde1c..e756b461b 100644
--- a/pceplib/pcep_msg_tools.h
+++ b/pceplib/pcep_msg_tools.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  */
 
diff --git a/pceplib/pcep_pcc.c b/pceplib/pcep_pcc.c
index 47e357729..92a968ef7 100644
--- a/pceplib/pcep_pcc.c
+++ b/pceplib/pcep_pcc.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_pcc_api.c b/pceplib/pcep_pcc_api.c
index 75c2b59b6..a8076423b 100644
--- a/pceplib/pcep_pcc_api.c
+++ b/pceplib/pcep_pcc_api.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_pcc_api.h b/pceplib/pcep_pcc_api.h
index 5756e23ef..f29de68fb 100644
--- a/pceplib/pcep_pcc_api.h
+++ b/pceplib/pcep_pcc_api.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_session_logic.c b/pceplib/pcep_session_logic.c
index 02cf3bffb..f71c93a73 100644
--- a/pceplib/pcep_session_logic.c
+++ b/pceplib/pcep_session_logic.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_session_logic.h b/pceplib/pcep_session_logic.h
index 9cdec5250..d7ef7c355 100644
--- a/pceplib/pcep_session_logic.h
+++ b/pceplib/pcep_session_logic.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_session_logic_counters.c b/pceplib/pcep_session_logic_counters.c
index fceb15af7..6f6f2a0df 100644
--- a/pceplib/pcep_session_logic_counters.c
+++ b/pceplib/pcep_session_logic_counters.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_session_logic_internals.h b/pceplib/pcep_session_logic_internals.h
index 004459b91..9c29c17b3 100644
--- a/pceplib/pcep_session_logic_internals.h
+++ b/pceplib/pcep_session_logic_internals.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_session_logic_loop.c b/pceplib/pcep_session_logic_loop.c
index 77392fb6a..6717f4676 100644
--- a/pceplib/pcep_session_logic_loop.c
+++ b/pceplib/pcep_session_logic_loop.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_session_logic_states.c b/pceplib/pcep_session_logic_states.c
index e7fbbb45e..269145216 100644
--- a/pceplib/pcep_session_logic_states.c
+++ b/pceplib/pcep_session_logic_states.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_socket_comm.c b/pceplib/pcep_socket_comm.c
index 4a97c8489..30fbc8270 100644
--- a/pceplib/pcep_socket_comm.c
+++ b/pceplib/pcep_socket_comm.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_socket_comm.h b/pceplib/pcep_socket_comm.h
index 89d249291..30edee410 100644
--- a/pceplib/pcep_socket_comm.h
+++ b/pceplib/pcep_socket_comm.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_socket_comm_internals.h b/pceplib/pcep_socket_comm_internals.h
index 4445a14fa..f5648477c 100644
--- a/pceplib/pcep_socket_comm_internals.h
+++ b/pceplib/pcep_socket_comm_internals.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_socket_comm_loop.c b/pceplib/pcep_socket_comm_loop.c
index ed8037d07..87c45d939 100644
--- a/pceplib/pcep_socket_comm_loop.c
+++ b/pceplib/pcep_socket_comm_loop.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_socket_comm_loop.h b/pceplib/pcep_socket_comm_loop.h
index 3ca2c037f..3c68efcef 100644
--- a/pceplib/pcep_socket_comm_loop.h
+++ b/pceplib/pcep_socket_comm_loop.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_socket_comm_mock.c b/pceplib/pcep_socket_comm_mock.c
index 7a9511e31..24755efee 100644
--- a/pceplib/pcep_socket_comm_mock.c
+++ b/pceplib/pcep_socket_comm_mock.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_socket_comm_mock.h b/pceplib/pcep_socket_comm_mock.h
index ca0e38b80..1290b8b7b 100644
--- a/pceplib/pcep_socket_comm_mock.h
+++ b/pceplib/pcep_socket_comm_mock.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_timer_internals.h b/pceplib/pcep_timer_internals.h
index 8221c78ba..a10243c0f 100644
--- a/pceplib/pcep_timer_internals.h
+++ b/pceplib/pcep_timer_internals.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_timers.c b/pceplib/pcep_timers.c
index 61fda1636..79ae563f1 100644
--- a/pceplib/pcep_timers.c
+++ b/pceplib/pcep_timers.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_timers.h b/pceplib/pcep_timers.h
index b2cc6ec54..bbd21bdda 100644
--- a/pceplib/pcep_timers.h
+++ b/pceplib/pcep_timers.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_timers_event_loop.c b/pceplib/pcep_timers_event_loop.c
index 898449671..ce75dde90 100644
--- a/pceplib/pcep_timers_event_loop.c
+++ b/pceplib/pcep_timers_event_loop.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_timers_event_loop.h b/pceplib/pcep_timers_event_loop.h
index c4a7264da..88d8d1453 100644
--- a/pceplib/pcep_timers_event_loop.h
+++ b/pceplib/pcep_timers_event_loop.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_counters.c b/pceplib/pcep_utils_counters.c
index d8078f683..badef9351 100644
--- a/pceplib/pcep_utils_counters.c
+++ b/pceplib/pcep_utils_counters.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_counters.h b/pceplib/pcep_utils_counters.h
index b10ced7d6..755c94eb0 100644
--- a/pceplib/pcep_utils_counters.h
+++ b/pceplib/pcep_utils_counters.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_double_linked_list.c b/pceplib/pcep_utils_double_linked_list.c
index 7f90df40f..2eeffb250 100644
--- a/pceplib/pcep_utils_double_linked_list.c
+++ b/pceplib/pcep_utils_double_linked_list.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_double_linked_list.h b/pceplib/pcep_utils_double_linked_list.h
index 4fe01726a..4eab428fe 100644
--- a/pceplib/pcep_utils_double_linked_list.h
+++ b/pceplib/pcep_utils_double_linked_list.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_logging.c b/pceplib/pcep_utils_logging.c
index 7afe55f12..926b662b3 100644
--- a/pceplib/pcep_utils_logging.c
+++ b/pceplib/pcep_utils_logging.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_logging.h b/pceplib/pcep_utils_logging.h
index 24ea495bd..2336114bc 100644
--- a/pceplib/pcep_utils_logging.h
+++ b/pceplib/pcep_utils_logging.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_memory.c b/pceplib/pcep_utils_memory.c
index 10856cac2..c3a2ab90c 100644
--- a/pceplib/pcep_utils_memory.c
+++ b/pceplib/pcep_utils_memory.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_memory.h b/pceplib/pcep_utils_memory.h
index 4624a91a1..a969143d7 100644
--- a/pceplib/pcep_utils_memory.h
+++ b/pceplib/pcep_utils_memory.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_ordered_list.c b/pceplib/pcep_utils_ordered_list.c
index 81eb61449..43b4863b4 100644
--- a/pceplib/pcep_utils_ordered_list.c
+++ b/pceplib/pcep_utils_ordered_list.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_ordered_list.h b/pceplib/pcep_utils_ordered_list.h
index ec132dc16..2d4e5c2a3 100644
--- a/pceplib/pcep_utils_ordered_list.h
+++ b/pceplib/pcep_utils_ordered_list.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_queue.c b/pceplib/pcep_utils_queue.c
index 22e417111..27a64b775 100644
--- a/pceplib/pcep_utils_queue.c
+++ b/pceplib/pcep_utils_queue.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/pcep_utils_queue.h b/pceplib/pcep_utils_queue.h
index 838067640..d3f8c20ca 100644
--- a/pceplib/pcep_utils_queue.h
+++ b/pceplib/pcep_utils_queue.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_messages_test.c b/pceplib/test/pcep_msg_messages_test.c
index e3a74f92d..c4eaeaab2 100644
--- a/pceplib/test/pcep_msg_messages_test.c
+++ b/pceplib/test/pcep_msg_messages_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_messages_test.h b/pceplib/test/pcep_msg_messages_test.h
index a3295c74e..b9cfa93e7 100644
--- a/pceplib/test/pcep_msg_messages_test.h
+++ b/pceplib/test/pcep_msg_messages_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_messages_tests.c b/pceplib/test/pcep_msg_messages_tests.c
index f24a797f7..8e8e7cdef 100644
--- a/pceplib/test/pcep_msg_messages_tests.c
+++ b/pceplib/test/pcep_msg_messages_tests.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_object_error_types_test.c b/pceplib/test/pcep_msg_object_error_types_test.c
index b1463751d..3237fecb1 100644
--- a/pceplib/test/pcep_msg_object_error_types_test.c
+++ b/pceplib/test/pcep_msg_object_error_types_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_object_error_types_test.h b/pceplib/test/pcep_msg_object_error_types_test.h
index 863517d1e..e395520e5 100644
--- a/pceplib/test/pcep_msg_object_error_types_test.h
+++ b/pceplib/test/pcep_msg_object_error_types_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_objects_test.c b/pceplib/test/pcep_msg_objects_test.c
index a92bbe489..1315fe3f3 100644
--- a/pceplib/test/pcep_msg_objects_test.c
+++ b/pceplib/test/pcep_msg_objects_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_objects_test.h b/pceplib/test/pcep_msg_objects_test.h
index 0f08193a5..3a3577be7 100644
--- a/pceplib/test/pcep_msg_objects_test.h
+++ b/pceplib/test/pcep_msg_objects_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_tlvs_test.c b/pceplib/test/pcep_msg_tlvs_test.c
index 888925fdb..3ead269a6 100644
--- a/pceplib/test/pcep_msg_tlvs_test.c
+++ b/pceplib/test/pcep_msg_tlvs_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_tlvs_test.h b/pceplib/test/pcep_msg_tlvs_test.h
index a961d7e47..78ef5acb6 100644
--- a/pceplib/test/pcep_msg_tlvs_test.h
+++ b/pceplib/test/pcep_msg_tlvs_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_tools_test.c b/pceplib/test/pcep_msg_tools_test.c
index ffbe802d3..858650ec8 100644
--- a/pceplib/test/pcep_msg_tools_test.c
+++ b/pceplib/test/pcep_msg_tools_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_msg_tools_test.h b/pceplib/test/pcep_msg_tools_test.h
index dc6639080..3d740d3bf 100644
--- a/pceplib/test/pcep_msg_tools_test.h
+++ b/pceplib/test/pcep_msg_tools_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_pcc_api_test.c b/pceplib/test/pcep_pcc_api_test.c
index 910667187..904308fdf 100644
--- a/pceplib/test/pcep_pcc_api_test.c
+++ b/pceplib/test/pcep_pcc_api_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_pcc_api_test.h b/pceplib/test/pcep_pcc_api_test.h
index d3db96e0c..493301018 100644
--- a/pceplib/test/pcep_pcc_api_test.h
+++ b/pceplib/test/pcep_pcc_api_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_pcc_api_tests.c b/pceplib/test/pcep_pcc_api_tests.c
index 5d9e92c1d..d0cfa683b 100644
--- a/pceplib/test/pcep_pcc_api_tests.c
+++ b/pceplib/test/pcep_pcc_api_tests.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_session_logic_loop_test.c b/pceplib/test/pcep_session_logic_loop_test.c
index 7a4271528..0f74cff31 100644
--- a/pceplib/test/pcep_session_logic_loop_test.c
+++ b/pceplib/test/pcep_session_logic_loop_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_session_logic_loop_test.h b/pceplib/test/pcep_session_logic_loop_test.h
index ae3c3e375..f2ad82225 100644
--- a/pceplib/test/pcep_session_logic_loop_test.h
+++ b/pceplib/test/pcep_session_logic_loop_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_session_logic_states_test.c b/pceplib/test/pcep_session_logic_states_test.c
index 17ddae669..695d59d7a 100644
--- a/pceplib/test/pcep_session_logic_states_test.c
+++ b/pceplib/test/pcep_session_logic_states_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_session_logic_states_test.h b/pceplib/test/pcep_session_logic_states_test.h
index e42b501ed..3d8dcc030 100644
--- a/pceplib/test/pcep_session_logic_states_test.h
+++ b/pceplib/test/pcep_session_logic_states_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_session_logic_test.c b/pceplib/test/pcep_session_logic_test.c
index 8339a7a28..c5b2bb3e2 100644
--- a/pceplib/test/pcep_session_logic_test.c
+++ b/pceplib/test/pcep_session_logic_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_session_logic_test.h b/pceplib/test/pcep_session_logic_test.h
index 6cc196325..325b8079c 100644
--- a/pceplib/test/pcep_session_logic_test.h
+++ b/pceplib/test/pcep_session_logic_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_session_logic_tests.c b/pceplib/test/pcep_session_logic_tests.c
index 9a15390c1..eac574e65 100644
--- a/pceplib/test/pcep_session_logic_tests.c
+++ b/pceplib/test/pcep_session_logic_tests.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_socket_comm_loop_test.c b/pceplib/test/pcep_socket_comm_loop_test.c
index 748cf433e..3b51635d9 100644
--- a/pceplib/test/pcep_socket_comm_loop_test.c
+++ b/pceplib/test/pcep_socket_comm_loop_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_socket_comm_loop_test.h b/pceplib/test/pcep_socket_comm_loop_test.h
index d2e3f21ee..36220a9dd 100644
--- a/pceplib/test/pcep_socket_comm_loop_test.h
+++ b/pceplib/test/pcep_socket_comm_loop_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_socket_comm_test.c b/pceplib/test/pcep_socket_comm_test.c
index 116531f12..c0b73c3db 100644
--- a/pceplib/test/pcep_socket_comm_test.c
+++ b/pceplib/test/pcep_socket_comm_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_socket_comm_test.h b/pceplib/test/pcep_socket_comm_test.h
index f857af087..a4d1dd4fd 100644
--- a/pceplib/test/pcep_socket_comm_test.h
+++ b/pceplib/test/pcep_socket_comm_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_socket_comm_tests.c b/pceplib/test/pcep_socket_comm_tests.c
index 6a5839d3d..2f39a9d13 100644
--- a/pceplib/test/pcep_socket_comm_tests.c
+++ b/pceplib/test/pcep_socket_comm_tests.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_timers_event_loop_test.c b/pceplib/test/pcep_timers_event_loop_test.c
index 79ed84bfe..6ab2bf7d5 100644
--- a/pceplib/test/pcep_timers_event_loop_test.c
+++ b/pceplib/test/pcep_timers_event_loop_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_timers_event_loop_test.h b/pceplib/test/pcep_timers_event_loop_test.h
index 19fd26485..cc49908be 100644
--- a/pceplib/test/pcep_timers_event_loop_test.h
+++ b/pceplib/test/pcep_timers_event_loop_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_timers_test.c b/pceplib/test/pcep_timers_test.c
index e5be90a8e..c782d7977 100644
--- a/pceplib/test/pcep_timers_test.c
+++ b/pceplib/test/pcep_timers_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_timers_test.h b/pceplib/test/pcep_timers_test.h
index 6ac9a90e4..b37bb6b1e 100644
--- a/pceplib/test/pcep_timers_test.h
+++ b/pceplib/test/pcep_timers_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_timers_tests.c b/pceplib/test/pcep_timers_tests.c
index f3aa8307a..7043bd497 100644
--- a/pceplib/test/pcep_timers_tests.c
+++ b/pceplib/test/pcep_timers_tests.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_counters_test.c b/pceplib/test/pcep_utils_counters_test.c
index b31715f7a..2cad9a644 100644
--- a/pceplib/test/pcep_utils_counters_test.c
+++ b/pceplib/test/pcep_utils_counters_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_counters_test.h b/pceplib/test/pcep_utils_counters_test.h
index 07236dcb5..2d4c80148 100644
--- a/pceplib/test/pcep_utils_counters_test.h
+++ b/pceplib/test/pcep_utils_counters_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_double_linked_list_test.c b/pceplib/test/pcep_utils_double_linked_list_test.c
index 181cbeca3..378c94976 100644
--- a/pceplib/test/pcep_utils_double_linked_list_test.c
+++ b/pceplib/test/pcep_utils_double_linked_list_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_double_linked_list_test.h b/pceplib/test/pcep_utils_double_linked_list_test.h
index ddb6467cb..f04d456c2 100644
--- a/pceplib/test/pcep_utils_double_linked_list_test.h
+++ b/pceplib/test/pcep_utils_double_linked_list_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_memory_test.c b/pceplib/test/pcep_utils_memory_test.c
index 0958626a0..a7d25216f 100644
--- a/pceplib/test/pcep_utils_memory_test.c
+++ b/pceplib/test/pcep_utils_memory_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_memory_test.h b/pceplib/test/pcep_utils_memory_test.h
index 4e0c3fadf..851654843 100644
--- a/pceplib/test/pcep_utils_memory_test.h
+++ b/pceplib/test/pcep_utils_memory_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_ordered_list_test.c b/pceplib/test/pcep_utils_ordered_list_test.c
index 12ac456e2..8b236cc6d 100644
--- a/pceplib/test/pcep_utils_ordered_list_test.c
+++ b/pceplib/test/pcep_utils_ordered_list_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_ordered_list_test.h b/pceplib/test/pcep_utils_ordered_list_test.h
index 3686848b6..550ac50c9 100644
--- a/pceplib/test/pcep_utils_ordered_list_test.h
+++ b/pceplib/test/pcep_utils_ordered_list_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_queue_test.c b/pceplib/test/pcep_utils_queue_test.c
index 6e62c7563..545ad499e 100644
--- a/pceplib/test/pcep_utils_queue_test.c
+++ b/pceplib/test/pcep_utils_queue_test.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_queue_test.h b/pceplib/test/pcep_utils_queue_test.h
index 16236d0d9..bfe3f6527 100644
--- a/pceplib/test/pcep_utils_queue_test.h
+++ b/pceplib/test/pcep_utils_queue_test.h
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Javier Garcia <javier.garcia@voltanet.io>
  *
  */
diff --git a/pceplib/test/pcep_utils_tests.c b/pceplib/test/pcep_utils_tests.c
index ad9f76933..343c80098 100644
--- a/pceplib/test/pcep_utils_tests.c
+++ b/pceplib/test/pcep_utils_tests.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * This file is part of the PCEPlib, a PCEP protocol library.
  *
  * Copyright (C) 2020 Volta Networks https://voltanet.io/
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
  * Author : Brady Johnson <brady@voltanet.io>
  *
  */
diff --git a/pimd/mtracebis.c b/pimd/mtracebis.c
index 3b6996496..9c3f1a7a9 100644
--- a/pimd/mtracebis.c
+++ b/pimd/mtracebis.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Multicast Traceroute for FRRouting
  * Copyright (C) 2018  Mladen Sablic
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/mtracebis_netlink.c b/pimd/mtracebis_netlink.c
index 9bdf94900..16873ed3e 100644
--- a/pimd/mtracebis_netlink.c
+++ b/pimd/mtracebis_netlink.c
@@ -1,11 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * libnetlink.c	RTnetlink service routines.
  *
- *		This program is free software; you can redistribute it and/or
- *		modify it under the terms of the GNU General Public License
- *		as published by the Free Software Foundation; either version
- *		2 of the License, or (at your option) any later version.
- *
  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  *
  */
diff --git a/pimd/mtracebis_netlink.h b/pimd/mtracebis_netlink.h
index 46e176e72..1f22927d4 100644
--- a/pimd/mtracebis_netlink.h
+++ b/pimd/mtracebis_netlink.h
@@ -1,11 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * libnetlink.c	RTnetlink service routines.
  *
- *		This program is free software; you can redistribute it and/or
- *		modify it under the terms of the GNU General Public License
- *		as published by the Free Software Foundation; either version
- *		2 of the License, or (at your option) any later version.
- *
  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  *
  */
diff --git a/pimd/mtracebis_routeget.c b/pimd/mtracebis_routeget.c
index 8d974403a..20618fa38 100644
--- a/pimd/mtracebis_routeget.c
+++ b/pimd/mtracebis_routeget.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Multicast Traceroute for FRRouting
  * Copyright (C) 2018  Mladen Sablic
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/pimd/mtracebis_routeget.h b/pimd/mtracebis_routeget.h
index 18ecf6ebf..cf97723da 100644
--- a/pimd/mtracebis_routeget.h
+++ b/pimd/mtracebis_routeget.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Multicast Traceroute for FRRouting
  * Copyright (C) 2018  Mladen Sablic
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef __linux__
diff --git a/pimd/pim6_cmd.c b/pimd/pim6_cmd.c
index bd6d22947..eb29a57e2 100644
--- a/pimd/pim6_cmd.c
+++ b/pimd/pim6_cmd.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for IPv6 FRR
  * Copyright (C) 2022  Vmware, Inc.
  *		       Mobashshera Rasool <mrasool@vmware.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim6_cmd.h b/pimd/pim6_cmd.h
index d9ff2ca70..201d8d6bc 100644
--- a/pimd/pim6_cmd.h
+++ b/pimd/pim6_cmd.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for IPv6 FRR
  * Copyright (C) 2022  Vmware, Inc.
  *		       Mobashshera Rasool <mrasool@vmware.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef PIM6_CMD_H
 #define PIM6_CMD_H
diff --git a/pimd/pim6_main.c b/pimd/pim6_main.c
index 7ac22fd02..1af4a17e5 100644
--- a/pimd/pim6_main.c
+++ b/pimd/pim6_main.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIMv6 main()
  * Copyright (C) 2021  David Lamparter for NetDEF, Inc.
  * Copyright (C) 2008  Everton da Silva Marques (pim_main.c)
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim6_mld.c b/pimd/pim6_mld.c
index 6faa53afe..75d809882 100644
--- a/pimd/pim6_mld.c
+++ b/pimd/pim6_mld.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIMv6 MLD querier
  * Copyright (C) 2021-2022  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/pimd/pim6_mld.h b/pimd/pim6_mld.h
index 540d2e189..2af1c77c2 100644
--- a/pimd/pim6_mld.h
+++ b/pimd/pim6_mld.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIMv6 MLD querier
  * Copyright (C) 2021-2022  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM6_MLD_H
diff --git a/pimd/pim6_mld_protocol.h b/pimd/pim6_mld_protocol.h
index 8e602d339..08d787198 100644
--- a/pimd/pim6_mld_protocol.h
+++ b/pimd/pim6_mld_protocol.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * MLD protocol definitions
  * Copyright (C) 2022  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _PIM6_MLD_PROTOCOL_H
diff --git a/pimd/pim_addr.c b/pimd/pim_addr.c
index 6ba0947c2..91a0bb85c 100644
--- a/pimd/pim_addr.c
+++ b/pimd/pim_addr.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM address generalizations
  * Copyright (C) 2022  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_addr.h b/pimd/pim_addr.h
index d15e97885..cc473d1f8 100644
--- a/pimd/pim_addr.h
+++ b/pimd/pim_addr.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM address generalizations
  * Copyright (C) 2022  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _PIMD_PIM_ADDR_H
diff --git a/pimd/pim_assert.c b/pimd/pim_assert.c
index fdd7191df..e46fa2cfa 100644
--- a/pimd/pim_assert.c
+++ b/pimd/pim_assert.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_assert.h b/pimd/pim_assert.h
index 22bab67c5..41f32ea4d 100644
--- a/pimd/pim_assert.h
+++ b/pimd/pim_assert.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_ASSERT_H
diff --git a/pimd/pim_bfd.c b/pimd/pim_bfd.c
index c1f8220db..43d9f0899 100644
--- a/pimd/pim_bfd.c
+++ b/pimd/pim_bfd.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * pim_bfd.c: PIM BFD handling routines
  *
  * Copyright (C) 2017 Cumulus Networks, Inc.
  * Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_bfd.h b/pimd/pim_bfd.h
index 3bfbb7486..3d8e29a99 100644
--- a/pimd/pim_bfd.h
+++ b/pimd/pim_bfd.h
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * pim_bfd.h: PIM BFD definitions and structures
  *
  * Copyright (C) 2017 Cumulus Networks, Inc.
  * Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #ifndef PIM_BFD_H
diff --git a/pimd/pim_bsm.c b/pimd/pim_bsm.c
index 1f7dd2f3f..c249f323d 100644
--- a/pimd/pim_bsm.c
+++ b/pimd/pim_bsm.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * pim_bsm.c: PIM BSM handling routines
  *
  * Copyright (C) 2018-19 Vmware, Inc.
  * Saravanan K
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/pimd/pim_bsm.h b/pimd/pim_bsm.h
index 90bd2f087..5e40adb80 100644
--- a/pimd/pim_bsm.h
+++ b/pimd/pim_bsm.h
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * pim_bsm.h: PIM BSM handling related
  *
  * Copyright (C) 2018-19 Vmware, Inc.
  * Saravanan K
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #ifndef __PIM_BSM_H__
diff --git a/pimd/pim_cmd.c b/pimd/pim_cmd.c
index d73ec2990..8c75b0a5b 100644
--- a/pimd/pim_cmd.c
+++ b/pimd/pim_cmd.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_cmd.h b/pimd/pim_cmd.h
index 8022eeea0..fb6693491 100644
--- a/pimd/pim_cmd.h
+++ b/pimd/pim_cmd.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_CMD_H
diff --git a/pimd/pim_cmd_common.c b/pimd/pim_cmd_common.c
index 9b571415f..c7b501ee1 100644
--- a/pimd/pim_cmd_common.c
+++ b/pimd/pim_cmd_common.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for IPv6 FRR
  * Copyright (C) 2022  Vmware, Inc.
  *		       Mobashshera Rasool <mrasool@vmware.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_cmd_common.h b/pimd/pim_cmd_common.h
index d34a4af9e..e30203fad 100644
--- a/pimd/pim_cmd_common.h
+++ b/pimd/pim_cmd_common.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for IPv6 FRR
  * Copyright (C) 2022  Vmware, Inc.
  *		       Mobashshera Rasool <mrasool@vmware.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef PIM_CMD_COMMON_H
 #define PIM_CMD_COMMON_H
diff --git a/pimd/pim_errors.c b/pimd/pim_errors.c
index 0674a4e99..1f98cec78 100644
--- a/pimd/pim_errors.c
+++ b/pimd/pim_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_errors.h b/pimd/pim_errors.h
index d73caa3f8..7de35f0ad 100644
--- a/pimd/pim_errors.h
+++ b/pimd/pim_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __PIM_ERRORS_H__
diff --git a/pimd/pim_hello.c b/pimd/pim_hello.c
index 03ce8687e..8d1924741 100644
--- a/pimd/pim_hello.c
+++ b/pimd/pim_hello.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_hello.h b/pimd/pim_hello.h
index 56084e06d..0e57c8f7a 100644
--- a/pimd/pim_hello.h
+++ b/pimd/pim_hello.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_HELLO_H
diff --git a/pimd/pim_iface.c b/pimd/pim_iface.c
index db9156b04..0ba7b5a65 100644
--- a/pimd/pim_iface.c
+++ b/pimd/pim_iface.c
@@ -1,19 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_iface.h b/pimd/pim_iface.h
index 0f1600d48..83079020b 100644
--- a/pimd/pim_iface.h
+++ b/pimd/pim_iface.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_IFACE_H
diff --git a/pimd/pim_ifchannel.c b/pimd/pim_ifchannel.c
index 082862709..136498beb 100644
--- a/pimd/pim_ifchannel.c
+++ b/pimd/pim_ifchannel.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_ifchannel.h b/pimd/pim_ifchannel.h
index 0c5b6780d..7ab491e99 100644
--- a/pimd/pim_ifchannel.h
+++ b/pimd/pim_ifchannel.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_IFCHANNEL_H
diff --git a/pimd/pim_igmp.c b/pimd/pim_igmp.c
index 308cba069..bff0c0683 100644
--- a/pimd/pim_igmp.c
+++ b/pimd/pim_igmp.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_igmp.h b/pimd/pim_igmp.h
index 9ce3a2a17..e275b5b39 100644
--- a/pimd/pim_igmp.h
+++ b/pimd/pim_igmp.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_IGMP_H
diff --git a/pimd/pim_igmp_join.h b/pimd/pim_igmp_join.h
index 8027b8b94..d6d22be3e 100644
--- a/pimd/pim_igmp_join.h
+++ b/pimd/pim_igmp_join.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_IGMP_JOIN_H
diff --git a/pimd/pim_igmp_mtrace.c b/pimd/pim_igmp_mtrace.c
index 259c34c81..4d3f6022a 100644
--- a/pimd/pim_igmp_mtrace.c
+++ b/pimd/pim_igmp_mtrace.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Multicast traceroute for FRRouting
  * Copyright (C) 2017  Mladen Sablic
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* based on draft-ietf-idmr-traceroute-ipm-07 */
diff --git a/pimd/pim_igmp_mtrace.h b/pimd/pim_igmp_mtrace.h
index 760b2e417..bba9c10fb 100644
--- a/pimd/pim_igmp_mtrace.h
+++ b/pimd/pim_igmp_mtrace.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Multicast traceroute for FRRouting
  * Copyright (C) 2017  Mladen Sablic
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_IGMP_MTRACE_H
diff --git a/pimd/pim_igmp_stats.c b/pimd/pim_igmp_stats.c
index 1d5110468..8ad3fb527 100644
--- a/pimd/pim_igmp_stats.c
+++ b/pimd/pim_igmp_stats.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for FRRouting
  * Copyright (C) 2018  Mladen Sablic
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/pimd/pim_igmp_stats.h b/pimd/pim_igmp_stats.h
index 8c66986e0..a3ce486a6 100644
--- a/pimd/pim_igmp_stats.h
+++ b/pimd/pim_igmp_stats.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for FRRouting
  * Copyright (C) 2018  Mladen Sablic
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_IGMP_STATS_H
diff --git a/pimd/pim_igmpv2.c b/pimd/pim_igmpv2.c
index 188c1bfe4..944dffdc3 100644
--- a/pimd/pim_igmpv2.c
+++ b/pimd/pim_igmpv2.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2016 Cumulus Networks, Inc.
  * Daniel Walton
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/pimd/pim_igmpv2.h b/pimd/pim_igmpv2.h
index 4e6dc6995..e968d8362 100644
--- a/pimd/pim_igmpv2.h
+++ b/pimd/pim_igmpv2.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2016 Cumulus Networks, Inc.
  * Daniel Walton
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_IGMPV2_H
diff --git a/pimd/pim_igmpv3.c b/pimd/pim_igmpv3.c
index 8961c9326..f10bcaf04 100644
--- a/pimd/pim_igmpv3.c
+++ b/pimd/pim_igmpv3.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_igmpv3.h b/pimd/pim_igmpv3.h
index 5041e54cb..43c7df473 100644
--- a/pimd/pim_igmpv3.h
+++ b/pimd/pim_igmpv3.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_IGMPV3_H
diff --git a/pimd/pim_instance.c b/pimd/pim_instance.c
index 4b85d4575..b50d9954f 100644
--- a/pimd/pim_instance.c
+++ b/pimd/pim_instance.c
@@ -1,22 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for FRR - PIM Instance
  * Copyright (C) 2017 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pimd/pim_instance.h b/pimd/pim_instance.h
index 57bc74efb..fa90e38a1 100644
--- a/pimd/pim_instance.h
+++ b/pimd/pim_instance.h
@@ -1,22 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for FRR - PIM Instance
  * Copyright (C) 2017 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 #ifndef __PIM_INSTANCE_H__
 #define __PIM_INSTANCE_H__
diff --git a/pimd/pim_int.c b/pimd/pim_int.c
index 377839906..6c98a8019 100644
--- a/pimd/pim_int.c
+++ b/pimd/pim_int.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_int.h b/pimd/pim_int.h
index 54623ed21..9e386726b 100644
--- a/pimd/pim_int.h
+++ b/pimd/pim_int.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_INT_H
diff --git a/pimd/pim_join.c b/pimd/pim_join.c
index e028b6aa7..20821d58b 100644
--- a/pimd/pim_join.c
+++ b/pimd/pim_join.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_join.h b/pimd/pim_join.h
index b359f2e5b..a28d805a8 100644
--- a/pimd/pim_join.h
+++ b/pimd/pim_join.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_JOIN_H
diff --git a/pimd/pim_jp_agg.c b/pimd/pim_jp_agg.c
index 44ebbb4de..40332ed8b 100644
--- a/pimd/pim_jp_agg.c
+++ b/pimd/pim_jp_agg.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for FRR - J/P Aggregation
  * Copyright (C) 2017 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pimd/pim_jp_agg.h b/pimd/pim_jp_agg.h
index ee1ca6ac7..926d21157 100644
--- a/pimd/pim_jp_agg.h
+++ b/pimd/pim_jp_agg.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for FRR - J/P Aggregation
  * Copyright (C) 2017 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __PIM_JP_AGG_H__
 #define __PIM_JP_AGG_H__
diff --git a/pimd/pim_macro.c b/pimd/pim_macro.c
index e4d463b70..2690fcadb 100644
--- a/pimd/pim_macro.c
+++ b/pimd/pim_macro.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_macro.h b/pimd/pim_macro.h
index b88a84e2d..39fa5358f 100644
--- a/pimd/pim_macro.h
+++ b/pimd/pim_macro.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_MACRO_H
diff --git a/pimd/pim_main.c b/pimd/pim_main.c
index dadc7827c..ce4326c61 100644
--- a/pimd/pim_main.c
+++ b/pimd/pim_main.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_memory.c b/pimd/pim_memory.c
index 1780b60a6..85780f013 100644
--- a/pimd/pim_memory.c
+++ b/pimd/pim_memory.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* pimd memory type definitions
  *
  * Copyright (C) 2015  David Lamparter
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/pimd/pim_memory.h b/pimd/pim_memory.h
index 385c81052..41730e752 100644
--- a/pimd/pim_memory.h
+++ b/pimd/pim_memory.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* pimd memory type declarations
  *
  * Copyright (C) 2015  David Lamparter
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_PIM_MEMORY_H
diff --git a/pimd/pim_mlag.c b/pimd/pim_mlag.c
index 2b457220f..61cf2860f 100644
--- a/pimd/pim_mlag.c
+++ b/pimd/pim_mlag.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of PIM MLAG Functionality
  *
@@ -6,20 +7,6 @@
  * Author: sathesh Kumar karra <sathk@cumulusnetworks.com>
  *
  * Copyright (C) 2019 Cumulus Networks http://www.cumulusnetworks.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pimd/pim_mlag.h b/pimd/pim_mlag.h
index 0555c7d3f..9cabd32ae 100644
--- a/pimd/pim_mlag.h
+++ b/pimd/pim_mlag.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of PIM MLAG Functionality
  *
@@ -6,20 +7,6 @@
  * Author: sathesh Kumar karra <sathk@cumulusnetworks.com>
  *
  * Copyright (C) 2019 Cumulus Networks http://www.cumulusnetworks.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __PIM_MLAG_H__
 #define __PIM_MLAG_H__
diff --git a/pimd/pim_mroute.c b/pimd/pim_mroute.c
index f1fd2ef73..af510ce29 100644
--- a/pimd/pim_mroute.c
+++ b/pimd/pim_mroute.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_mroute.h b/pimd/pim_mroute.h
index c409b9ed0..8706f4220 100644
--- a/pimd/pim_mroute.h
+++ b/pimd/pim_mroute.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_MROUTE_H
diff --git a/pimd/pim_msdp.c b/pimd/pim_msdp.c
index 0711a63f6..dfa5ffeee 100644
--- a/pimd/pim_msdp.c
+++ b/pimd/pim_msdp.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IP MSDP for Quagga
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_msdp.h b/pimd/pim_msdp.h
index 4e1114aff..f0a03f076 100644
--- a/pimd/pim_msdp.h
+++ b/pimd/pim_msdp.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IP MSDP for Quagga
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef PIM_MSDP_H
 #define PIM_MSDP_H
diff --git a/pimd/pim_msdp_packet.c b/pimd/pim_msdp_packet.c
index 838459099..a6f318e61 100644
--- a/pimd/pim_msdp_packet.c
+++ b/pimd/pim_msdp_packet.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IP MSDP packet helper
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pimd/pim_msdp_packet.h b/pimd/pim_msdp_packet.h
index 00324a291..efb14cdf7 100644
--- a/pimd/pim_msdp_packet.h
+++ b/pimd/pim_msdp_packet.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IP MSDP packet helpers
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef PIM_MSDP_PACKET_H
 #define PIM_MSDP_PACKET_H
diff --git a/pimd/pim_msdp_socket.c b/pimd/pim_msdp_socket.c
index 819a74712..a6b5ee11b 100644
--- a/pimd/pim_msdp_socket.c
+++ b/pimd/pim_msdp_socket.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IP MSDP socket management
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_msdp_socket.h b/pimd/pim_msdp_socket.h
index 8f46683df..ae31664f9 100644
--- a/pimd/pim_msdp_socket.h
+++ b/pimd/pim_msdp_socket.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IP MSDP socket management for Quagga
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef PIM_MSDP_SOCKET_H
 #define PIM_MSDP_SOCKET_H
diff --git a/pimd/pim_msg.c b/pimd/pim_msg.c
index 7e57b405f..5d1f08314 100644
--- a/pimd/pim_msg.c
+++ b/pimd/pim_msg.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_msg.h b/pimd/pim_msg.h
index 733210af3..56923b7ec 100644
--- a/pimd/pim_msg.h
+++ b/pimd/pim_msg.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_MSG_H
diff --git a/pimd/pim_nb.c b/pimd/pim_nb.c
index 94696bb4c..339935f81 100644
--- a/pimd/pim_nb.c
+++ b/pimd/pim_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020 VmWare
  *                    Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_nb.h b/pimd/pim_nb.h
index be3cab66c..0321d076f 100644
--- a/pimd/pim_nb.h
+++ b/pimd/pim_nb.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020 VmWare
  *                    Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_PIM_NB_H_
diff --git a/pimd/pim_nb_config.c b/pimd/pim_nb_config.c
index c4ff912cd..36e90a969 100644
--- a/pimd/pim_nb_config.c
+++ b/pimd/pim_nb_config.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020 VmWare
  *                    Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_neighbor.c b/pimd/pim_neighbor.c
index 7726ac00b..9edc3c1af 100644
--- a/pimd/pim_neighbor.c
+++ b/pimd/pim_neighbor.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_neighbor.h b/pimd/pim_neighbor.h
index a2a2df9e0..e00f99fe2 100644
--- a/pimd/pim_neighbor.h
+++ b/pimd/pim_neighbor.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_NEIGHBOR_H
diff --git a/pimd/pim_nht.c b/pimd/pim_nht.c
index 109de77d1..d73f366d4 100644
--- a/pimd/pim_nht.c
+++ b/pimd/pim_nht.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2017 Cumulus Networks, Inc.
  * Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include "network.h"
diff --git a/pimd/pim_nht.h b/pimd/pim_nht.h
index f487a21ba..5a54e1c67 100644
--- a/pimd/pim_nht.h
+++ b/pimd/pim_nht.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2017 Cumulus Networks, Inc.
  * Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef PIM_NHT_H
 #define PIM_NHT_H
diff --git a/pimd/pim_oil.c b/pimd/pim_oil.c
index dff1b4fed..63ddb85d0 100644
--- a/pimd/pim_oil.c
+++ b/pimd/pim_oil.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_oil.h b/pimd/pim_oil.h
index 5a2647b93..45b337cc7 100644
--- a/pimd/pim_oil.h
+++ b/pimd/pim_oil.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_OIL_H
diff --git a/pimd/pim_pim.c b/pimd/pim_pim.c
index 1dd99d7ec..a7a8b0575 100644
--- a/pimd/pim_pim.c
+++ b/pimd/pim_pim.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_pim.h b/pimd/pim_pim.h
index e2555eab8..35e693013 100644
--- a/pimd/pim_pim.h
+++ b/pimd/pim_pim.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_PIM_H
diff --git a/pimd/pim_register.c b/pimd/pim_register.c
index b62c646c3..5144fe67b 100644
--- a/pimd/pim_register.c
+++ b/pimd/pim_register.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2015 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_register.h b/pimd/pim_register.h
index ddb34921a..d1240d7b9 100644
--- a/pimd/pim_register.h
+++ b/pimd/pim_register.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2015 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef PIM_REGISTER_H
 #define PIM_REGISTER_H
diff --git a/pimd/pim_routemap.c b/pimd/pim_routemap.c
index 2de94e903..bd1a24eed 100644
--- a/pimd/pim_routemap.c
+++ b/pimd/pim_routemap.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* PIM Route-map Code
  * Copyright (C) 2016 Cumulus Networks <sharpd@cumulusnetworks.com>
  * Copyright (C) 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pimd/pim_rp.c b/pimd/pim_rp.c
index c3e6a303f..d59124ceb 100644
--- a/pimd/pim_rp.c
+++ b/pimd/pim_rp.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2015 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/pimd/pim_rp.h b/pimd/pim_rp.h
index e1bc71a3d..9416a9a8a 100644
--- a/pimd/pim_rp.h
+++ b/pimd/pim_rp.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2015 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef PIM_RP_H
 #define PIM_RP_H
diff --git a/pimd/pim_rpf.c b/pimd/pim_rpf.c
index d237a7312..06765d93d 100644
--- a/pimd/pim_rpf.c
+++ b/pimd/pim_rpf.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_rpf.h b/pimd/pim_rpf.h
index 2ddb9832f..7dae53f8f 100644
--- a/pimd/pim_rpf.h
+++ b/pimd/pim_rpf.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_RPF_H
diff --git a/pimd/pim_signals.c b/pimd/pim_signals.c
index 47220ccac..146a4e9e9 100644
--- a/pimd/pim_signals.c
+++ b/pimd/pim_signals.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_signals.h b/pimd/pim_signals.h
index ebc5b8eb2..a3ee604cd 100644
--- a/pimd/pim_signals.h
+++ b/pimd/pim_signals.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_SIGNALS_H
diff --git a/pimd/pim_sock.c b/pimd/pim_sock.c
index 4b91bf07d..6c65c5d3e 100644
--- a/pimd/pim_sock.c
+++ b/pimd/pim_sock.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_sock.h b/pimd/pim_sock.h
index 4dcb9e646..04ab86474 100644
--- a/pimd/pim_sock.h
+++ b/pimd/pim_sock.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_SOCK_H
diff --git a/pimd/pim_ssm.c b/pimd/pim_ssm.c
index 62246cc23..7b7503aeb 100644
--- a/pimd/pim_ssm.c
+++ b/pimd/pim_ssm.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IP SSM ranges for FRR
  * Copyright (C) 2017 Cumulus Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_ssm.h b/pimd/pim_ssm.h
index adc0cfdea..24a037e09 100644
--- a/pimd/pim_ssm.h
+++ b/pimd/pim_ssm.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IP SSM ranges for FRR
  * Copyright (C) 2017 Cumulus Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef PIM_SSM_H
 #define PIM_SSM_H
diff --git a/pimd/pim_ssmpingd.c b/pimd/pim_ssmpingd.c
index c8d40371e..2fc30b491 100644
--- a/pimd/pim_ssmpingd.c
+++ b/pimd/pim_ssmpingd.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_ssmpingd.h b/pimd/pim_ssmpingd.h
index c4376bd0e..fe1583979 100644
--- a/pimd/pim_ssmpingd.h
+++ b/pimd/pim_ssmpingd.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_SSMPINGD_H
diff --git a/pimd/pim_static.c b/pimd/pim_static.c
index f5449d282..f4320f0c6 100644
--- a/pimd/pim_static.c
+++ b/pimd/pim_static.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga: add the ability to configure multicast static routes
  * Copyright (C) 2014  Nathan Bahr, ATCorp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_static.h b/pimd/pim_static.h
index dcbc790d7..c868d0287 100644
--- a/pimd/pim_static.h
+++ b/pimd/pim_static.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga: add the ability to configure multicast static routes
  * Copyright (C) 2014  Nathan Bahr, ATCorp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_STATIC_H_
diff --git a/pimd/pim_str.c b/pimd/pim_str.c
index 8744d62d1..a0453769e 100644
--- a/pimd/pim_str.c
+++ b/pimd/pim_str.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_str.h b/pimd/pim_str.h
index 448177609..cc27d23c0 100644
--- a/pimd/pim_str.h
+++ b/pimd/pim_str.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_STR_H
diff --git a/pimd/pim_tib.c b/pimd/pim_tib.c
index 3455e3006..6ffea868d 100644
--- a/pimd/pim_tib.c
+++ b/pimd/pim_tib.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * TIB (Tree Information Base) - just PIM <> IGMP/MLD glue for now
  * Copyright (C) 2022  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_tib.h b/pimd/pim_tib.h
index b320f4cde..081ad908b 100644
--- a/pimd/pim_tib.h
+++ b/pimd/pim_tib.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * TIB (Tree Information Base) - just PIM <> IGMP/MLD glue for now
  * Copyright (C) 2022  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_PIM_GLUE_H
diff --git a/pimd/pim_time.c b/pimd/pim_time.c
index 93aaffb6a..c9555f531 100644
--- a/pimd/pim_time.c
+++ b/pimd/pim_time.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_time.h b/pimd/pim_time.h
index 5d02d6efc..fd1e79e2b 100644
--- a/pimd/pim_time.h
+++ b/pimd/pim_time.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_TIME_H
diff --git a/pimd/pim_tlv.c b/pimd/pim_tlv.c
index c9caf0016..80d60b862 100644
--- a/pimd/pim_tlv.c
+++ b/pimd/pim_tlv.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_tlv.h b/pimd/pim_tlv.h
index 63bd2c41f..ea2af6457 100644
--- a/pimd/pim_tlv.h
+++ b/pimd/pim_tlv.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_TLV_H
diff --git a/pimd/pim_upstream.c b/pimd/pim_upstream.c
index 4ef0bfaa4..d63d530f9 100644
--- a/pimd/pim_upstream.c
+++ b/pimd/pim_upstream.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_upstream.h b/pimd/pim_upstream.h
index 3841d1af7..890ba7d16 100644
--- a/pimd/pim_upstream.h
+++ b/pimd/pim_upstream.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_UPSTREAM_H
diff --git a/pimd/pim_util.c b/pimd/pim_util.c
index 273c332c9..948b615f7 100644
--- a/pimd/pim_util.c
+++ b/pimd/pim_util.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_util.h b/pimd/pim_util.h
index 6af79ddf6..c882fe487 100644
--- a/pimd/pim_util.h
+++ b/pimd/pim_util.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_UTIL_H
diff --git a/pimd/pim_vty.c b/pimd/pim_vty.c
index 553c1314d..91628930f 100644
--- a/pimd/pim_vty.c
+++ b/pimd/pim_vty.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_vty.h b/pimd/pim_vty.h
index 0f11d6ec4..84155af19 100644
--- a/pimd/pim_vty.h
+++ b/pimd/pim_vty.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_VTY_H
diff --git a/pimd/pim_vxlan.c b/pimd/pim_vxlan.c
index 5b63d0493..4c317a254 100644
--- a/pimd/pim_vxlan.c
+++ b/pimd/pim_vxlan.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* PIM support for VxLAN BUM flooding
  *
  * Copyright (C) 2019 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_vxlan.h b/pimd/pim_vxlan.h
index 1a7e9dcf1..6e1e066f0 100644
--- a/pimd/pim_vxlan.h
+++ b/pimd/pim_vxlan.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* PIM support for VxLAN BUM flooding
  *
  * Copyright (C) 2019 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifndef PIM_VXLAN_H
diff --git a/pimd/pim_vxlan_instance.h b/pimd/pim_vxlan_instance.h
index 5b35bcbea..65a595585 100644
--- a/pimd/pim_vxlan_instance.h
+++ b/pimd/pim_vxlan_instance.h
@@ -1,17 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* PIM support for VxLAN BUM flooding
  *
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
  */
 
 #ifndef PIM_VXLAN_INSTANCE_H
diff --git a/pimd/pim_zebra.c b/pimd/pim_zebra.c
index 2c76fd686..e39eca7a2 100644
--- a/pimd/pim_zebra.c
+++ b/pimd/pim_zebra.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_zebra.h b/pimd/pim_zebra.h
index 6710f1999..0ef63f237 100644
--- a/pimd/pim_zebra.h
+++ b/pimd/pim_zebra.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_ZEBRA_H
diff --git a/pimd/pim_zlookup.c b/pimd/pim_zlookup.c
index 8c0825fd2..08807d0dc 100644
--- a/pimd/pim_zlookup.c
+++ b/pimd/pim_zlookup.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pim_zlookup.h b/pimd/pim_zlookup.h
index 85d18d1d6..ee2dd2011 100644
--- a/pimd/pim_zlookup.h
+++ b/pimd/pim_zlookup.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIM_ZLOOKUP_H
diff --git a/pimd/pim_zpthread.c b/pimd/pim_zpthread.c
index b797ac184..bc515f27e 100644
--- a/pimd/pim_zpthread.c
+++ b/pimd/pim_zpthread.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pimd.c b/pimd/pimd.c
index a3be3f66e..db6197480 100644
--- a/pimd/pimd.c
+++ b/pimd/pimd.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/pimd/pimd.h b/pimd/pimd.h
index 3a80c24f7..9ec84fc0a 100644
--- a/pimd/pimd.h
+++ b/pimd/pimd.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef PIMD_H
diff --git a/pimd/test_igmpv3_join.c b/pimd/test_igmpv3_join.c
index 3c26517e8..07070900d 100644
--- a/pimd/test_igmpv3_join.c
+++ b/pimd/test_igmpv3_join.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * PIM for Quagga
  * Copyright (C) 2008  Everton da Silva Marques
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/python/callgraph-dot.py b/python/callgraph-dot.py
index 7d9825bd1..4e58b1938 100644
--- a/python/callgraph-dot.py
+++ b/python/callgraph-dot.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # callgraph json to graphviz generator for FRR
 #
 # Copyright (C) 2020  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 import re
 import sys
diff --git a/python/clidef.py b/python/clidef.py
index 101c9a5ae..d71b482a9 100644
--- a/python/clidef.py
+++ b/python/clidef.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # FRR CLI preprocessor (DEFPY)
 #
 # Copyright (C) 2017  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 import clippy, traceback, sys, os
 from collections import OrderedDict
diff --git a/python/clippy/__init__.py b/python/clippy/__init__.py
index 7c73598e5..60119fbac 100644
--- a/python/clippy/__init__.py
+++ b/python/clippy/__init__.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # FRR CLI preprocessor
 #
 # Copyright (C) 2017  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 import os, stat
 
diff --git a/python/clippy/elf.py b/python/clippy/elf.py
index d4d1f4cb8..cc442eeda 100644
--- a/python/clippy/elf.py
+++ b/python/clippy/elf.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # FRR libelf wrapper
 #
 # Copyright (C) 2020  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 """
 Wrapping layer and additional utility around _clippy.ELFFile.
diff --git a/python/clippy/uidhash.py b/python/clippy/uidhash.py
index 0fd886221..73570b20d 100644
--- a/python/clippy/uidhash.py
+++ b/python/clippy/uidhash.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # xref unique ID hash calculation
 #
 # Copyright (C) 2020  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 import struct
 from hashlib import sha256
diff --git a/python/firstheader.py b/python/firstheader.py
index 892e9da8d..06e289584 100644
--- a/python/firstheader.py
+++ b/python/firstheader.py
@@ -1,21 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # check that the first header included in C files is either
 # zebra.h or config.h
 #
 # Copyright (C) 2020  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 import sys
 import os
diff --git a/python/test_xrelfo.py b/python/test_xrelfo.py
index 3379959dc..c851bb042 100644
--- a/python/test_xrelfo.py
+++ b/python/test_xrelfo.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # some basic tests for xrelfo & the python ELF machinery
 #
 # Copyright (C) 2020  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 import sys
 import os
diff --git a/python/tiabwarfo.py b/python/tiabwarfo.py
index b19c75673..da20801ca 100644
--- a/python/tiabwarfo.py
+++ b/python/tiabwarfo.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # FRR DWARF structure definition extractor
 #
 # Copyright (C) 2020  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 import sys
 import os
diff --git a/python/xref2vtysh.py b/python/xref2vtysh.py
index f18aa20c9..a4f8560bb 100644
--- a/python/xref2vtysh.py
+++ b/python/xref2vtysh.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # FRR xref vtysh command extraction
 #
 # Copyright (C) 2022  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 """
 Generate vtysh_cmd.c from frr .xref file(s).
diff --git a/python/xrelfo.py b/python/xrelfo.py
index c75b4cb95..4c956ca6a 100644
--- a/python/xrelfo.py
+++ b/python/xrelfo.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # FRR ELF xref extractor
 #
 # Copyright (C) 2020  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 import sys
 import os
diff --git a/qpb/linear_allocator.h b/qpb/linear_allocator.h
index 40393a9a9..352d3ea50 100644
--- a/qpb/linear_allocator.h
+++ b/qpb/linear_allocator.h
@@ -1,25 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * linear_allocator.h
  *
  * @copyright Copyright (C) 2016 Sproute Networks, Inc.
  *
  * @author Avneesh Sachdev <avneesh@sproute.com>
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/qpb/qpb.c b/qpb/qpb.c
index 8e130f5f5..63454f115 100644
--- a/qpb/qpb.c
+++ b/qpb/qpb.c
@@ -1,25 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * qpb.c
  *
  * @copyright Copyright (C) 2016 Sproute Networks, Inc.
  *
  * @author Avneesh Sachdev <avneesh@sproute.com>
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/qpb/qpb.h b/qpb/qpb.h
index d4602e90a..d52528f41 100644
--- a/qpb/qpb.h
+++ b/qpb/qpb.h
@@ -1,25 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * qpb.h
  *
  * @copyright Copyright (C) 2016 Sproute Networks, Inc.
  *
  * @author Avneesh Sachdev <avneesh@sproute.com>
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/qpb/qpb.proto b/qpb/qpb.proto
index c06debb95..b09536832 100644
--- a/qpb/qpb.proto
+++ b/qpb/qpb.proto
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*
  * qpb.proto
  *
diff --git a/qpb/qpb_allocator.c b/qpb/qpb_allocator.c
index aca611ba1..e2749d6c8 100644
--- a/qpb/qpb_allocator.c
+++ b/qpb/qpb_allocator.c
@@ -1,25 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * qpb_allocator.c
  *
  * @copyright Copyright (C) 2016 Sproute Networks, Inc.
  *
  * @author Avneesh Sachdev <avneesh@sproute.com>
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/qpb/qpb_allocator.h b/qpb/qpb_allocator.h
index fd55592f8..ff0e466dc 100644
--- a/qpb/qpb_allocator.h
+++ b/qpb/qpb_allocator.h
@@ -1,25 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * qpb_allocator.h
  *
  * @copyright Copyright (C) 2016 Sproute Networks, Inc.
  *
  * @author Avneesh Sachdev <avneesh@sproute.com>
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/ripd/rip_cli.c b/ripd/rip_cli.c
index 34ea21672..cac29c00d 100644
--- a/ripd/rip_cli.c
+++ b/ripd/rip_cli.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_debug.c b/ripd/rip_debug.c
index ded62812a..e91d79196 100644
--- a/ripd/rip_debug.c
+++ b/ripd/rip_debug.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIP debug routines
  * Copyright (C) 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_debug.h b/ripd/rip_debug.h
index 3d819ccd0..ca9188f2a 100644
--- a/ripd/rip_debug.h
+++ b/ripd/rip_debug.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIP debug routines
  * Copyright (C) 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RIP_DEBUG_H
diff --git a/ripd/rip_errors.c b/ripd/rip_errors.c
index b6fc43ee7..483ea77af 100644
--- a/ripd/rip_errors.c
+++ b/ripd/rip_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * RIP-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_errors.h b/ripd/rip_errors.h
index feadf430e..93b44749e 100644
--- a/ripd/rip_errors.h
+++ b/ripd/rip_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * RIP-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __RIP_ERRORS_H__
diff --git a/ripd/rip_interface.c b/ripd/rip_interface.c
index 02da56e4f..3e6232172 100644
--- a/ripd/rip_interface.c
+++ b/ripd/rip_interface.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Interface related function for RIP.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_interface.h b/ripd/rip_interface.h
index fe26a78bd..eee654b49 100644
--- a/ripd/rip_interface.h
+++ b/ripd/rip_interface.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIP interface routines
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_RIP_INTERFACE_H
diff --git a/ripd/rip_main.c b/ripd/rip_main.c
index 6fb5ca95a..e26424ade 100644
--- a/ripd/rip_main.c
+++ b/ripd/rip_main.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIPd main routine.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_nb.c b/ripd/rip_nb.c
index 4716041ad..9947c01af 100644
--- a/ripd/rip_nb.c
+++ b/ripd/rip_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_nb.h b/ripd/rip_nb.h
index 1e29f3b77..99114c992 100644
--- a/ripd/rip_nb.h
+++ b/ripd/rip_nb.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_RIP_NB_H_
diff --git a/ripd/rip_nb_config.c b/ripd/rip_nb_config.c
index 5b1917e17..2277ddc20 100644
--- a/ripd/rip_nb_config.c
+++ b/ripd/rip_nb_config.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_nb_notifications.c b/ripd/rip_nb_notifications.c
index 28d3517df..80da39b5f 100644
--- a/ripd/rip_nb_notifications.c
+++ b/ripd/rip_nb_notifications.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_nb_rpcs.c b/ripd/rip_nb_rpcs.c
index 25641f2f7..be5528481 100644
--- a/ripd/rip_nb_rpcs.c
+++ b/ripd/rip_nb_rpcs.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_nb_state.c b/ripd/rip_nb_state.c
index 9b8f518cd..0e2931b46 100644
--- a/ripd/rip_nb_state.c
+++ b/ripd/rip_nb_state.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_offset.c b/ripd/rip_offset.c
index d49922934..4c93f712f 100644
--- a/ripd/rip_offset.c
+++ b/ripd/rip_offset.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIP offset-list
  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_peer.c b/ripd/rip_peer.c
index a52914bcf..a3cba598d 100644
--- a/ripd/rip_peer.c
+++ b/ripd/rip_peer.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIP peer support
  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_routemap.c b/ripd/rip_routemap.c
index 4da5f945f..2ae8857e3 100644
--- a/ripd/rip_routemap.c
+++ b/ripd/rip_routemap.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIPv2 routemap.
  * Copyright (C) 2005 6WIND <alain.ritoux@6wind.com>
  * Copyright (C) 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_snmp.c b/ripd/rip_snmp.c
index 0ce380406..ab80dd1b8 100644
--- a/ripd/rip_snmp.c
+++ b/ripd/rip_snmp.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIP SNMP support
  * Copyright (C) 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/rip_zebra.c b/ripd/rip_zebra.c
index 1f1566863..4a58d1225 100644
--- a/ripd/rip_zebra.c
+++ b/ripd/rip_zebra.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIPd and zebra interface.
  * Copyright (C) 1997, 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/ripd.c b/ripd/ripd.c
index 8e02f1a6c..bde7e858f 100644
--- a/ripd/ripd.c
+++ b/ripd/ripd.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIP version 1 and 2.
  * Copyright (C) 2005 6WIND <alain.ritoux@6wind.com>
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripd/ripd.h b/ripd/ripd.h
index d26592dac..4894cb863 100644
--- a/ripd/ripd.h
+++ b/ripd/ripd.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIP related values and structures.
  * Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RIP_H
diff --git a/ripngd/ripng_cli.c b/ripngd/ripng_cli.c
index 049a392dd..5e59dfd2c 100644
--- a/ripngd/ripng_cli.c
+++ b/ripngd/ripng_cli.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 1998 Kunihiro Ishiguro
  * Copyright (C) 2018 NetDEF, Inc.
  *                    Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripng_debug.c b/ripngd/ripng_debug.c
index d36327cb7..5ddd7acf3 100644
--- a/ripngd/ripng_debug.c
+++ b/ripngd/ripng_debug.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * RIPng debug output routines
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripng_debug.h b/ripngd/ripng_debug.h
index 81cb0f9c7..7af920661 100644
--- a/ripngd/ripng_debug.h
+++ b/ripngd/ripng_debug.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * RIPng debug output routines
  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RIPNG_DEBUG_H
diff --git a/ripngd/ripng_interface.c b/ripngd/ripng_interface.c
index 3068d04b7..1fc6f2553 100644
--- a/ripngd/ripng_interface.c
+++ b/ripngd/ripng_interface.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Interface related function for RIPng.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripng_main.c b/ripngd/ripng_main.c
index bc169785a..14e69834c 100644
--- a/ripngd/ripng_main.c
+++ b/ripngd/ripng_main.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * RIPngd main routine.
  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripng_nb.c b/ripngd/ripng_nb.c
index a02a72112..63144d866 100644
--- a/ripngd/ripng_nb.c
+++ b/ripngd/ripng_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018 NetDEF, Inc.
  *                    Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripng_nb.h b/ripngd/ripng_nb.h
index cf0424248..675cef7c9 100644
--- a/ripngd/ripng_nb.h
+++ b/ripngd/ripng_nb.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018 NetDEF, Inc.
  *                    Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_RIPNG_NB_H_
diff --git a/ripngd/ripng_nb_config.c b/ripngd/ripng_nb_config.c
index 25bf65f7a..006bf79ce 100644
--- a/ripngd/ripng_nb_config.c
+++ b/ripngd/ripng_nb_config.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 1998 Kunihiro Ishiguro
  * Copyright (C) 2018 NetDEF, Inc.
  *                    Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripng_nb_rpcs.c b/ripngd/ripng_nb_rpcs.c
index 57a5f2668..381ff717c 100644
--- a/ripngd/ripng_nb_rpcs.c
+++ b/ripngd/ripng_nb_rpcs.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018 NetDEF, Inc.
  *                    Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripng_nb_state.c b/ripngd/ripng_nb_state.c
index 02a00ac42..3f37df305 100644
--- a/ripngd/ripng_nb_state.c
+++ b/ripngd/ripng_nb_state.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018 NetDEF, Inc.
  *                    Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripng_nexthop.c b/ripngd/ripng_nexthop.c
index 50972feff..38e7ce251 100644
--- a/ripngd/ripng_nexthop.c
+++ b/ripngd/ripng_nexthop.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIPngd Zebra
  * Copyright (C) 2002 6WIND <vincent.jardin@6wind.com>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* This file is required in order to support properly the RIPng nexthop
diff --git a/ripngd/ripng_nexthop.h b/ripngd/ripng_nexthop.h
index 92ab7e0cd..2d2993958 100644
--- a/ripngd/ripng_nexthop.h
+++ b/ripngd/ripng_nexthop.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIPng nexthop support
  * Copyright (C) 6WIND Vincent Jardin <vincent.jardin@6wind.com>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RIPNG_RIPNG_NEXTHOP_H
diff --git a/ripngd/ripng_offset.c b/ripngd/ripng_offset.c
index 38c69f1b7..ba3ba558a 100644
--- a/ripngd/ripng_offset.c
+++ b/ripngd/ripng_offset.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIPng offset-list
  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* RIPng support by Vincent Jardin <vincent.jardin@6wind.com>
diff --git a/ripngd/ripng_peer.c b/ripngd/ripng_peer.c
index 37cfe9833..75a9ed77f 100644
--- a/ripngd/ripng_peer.c
+++ b/ripngd/ripng_peer.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIPng peer support
  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* RIPng support added by Vincent Jardin <vincent.jardin@6wind.com>
diff --git a/ripngd/ripng_route.c b/ripngd/ripng_route.c
index 1eb1d0f31..80041fbeb 100644
--- a/ripngd/ripng_route.c
+++ b/ripngd/ripng_route.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * RIPng routes function.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripng_route.h b/ripngd/ripng_route.h
index afc1d1cbc..fb3d71ca6 100644
--- a/ripngd/ripng_route.h
+++ b/ripngd/ripng_route.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * RIPng daemon
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RIPNG_ROUTE_H
diff --git a/ripngd/ripng_routemap.c b/ripngd/ripng_routemap.c
index 4f2f9e210..3e6880b4d 100644
--- a/ripngd/ripng_routemap.c
+++ b/ripngd/ripng_routemap.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIPng routemap.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripng_zebra.c b/ripngd/ripng_zebra.c
index 4108aa506..b126a15b5 100644
--- a/ripngd/ripng_zebra.c
+++ b/ripngd/ripng_zebra.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * RIPngd and zebra interface.
  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripngd.c b/ripngd/ripngd.c
index 0350dc224..f01371f41 100644
--- a/ripngd/ripngd.c
+++ b/ripngd/ripngd.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* RIPng daemon
  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/ripngd/ripngd.h b/ripngd/ripngd.h
index ac2edc5b2..59b948b8f 100644
--- a/ripngd/ripngd.h
+++ b/ripngd/ripngd.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * RIPng related value and structure.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RIPNG_RIPNGD_H
diff --git a/sharpd/sharp_globals.h b/sharpd/sharp_globals.h
index 46096f4aa..76b043b26 100644
--- a/sharpd/sharp_globals.h
+++ b/sharpd/sharp_globals.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SHARP - code to track globals
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __SHARP_GLOBAL_H__
 #define __SHARP_GLOBAL_H__
diff --git a/sharpd/sharp_logpump.c b/sharpd/sharp_logpump.c
index ad1051f22..cadd81895 100644
--- a/sharpd/sharp_logpump.c
+++ b/sharpd/sharp_logpump.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * testing log message generator
  * Copyright (C) 2019-2020  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/sharpd/sharp_main.c b/sharpd/sharp_main.c
index d7783b6fc..9d33fc89a 100644
--- a/sharpd/sharp_main.c
+++ b/sharpd/sharp_main.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SHARP - main code
  * Copyright (C) Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/sharpd/sharp_nht.c b/sharpd/sharp_nht.c
index b032da6a1..fa7880572 100644
--- a/sharpd/sharp_nht.c
+++ b/sharpd/sharp_nht.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SHARP - code to track nexthops
  * Copyright (C) Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/sharpd/sharp_nht.h b/sharpd/sharp_nht.h
index da3350287..5523f2807 100644
--- a/sharpd/sharp_nht.h
+++ b/sharpd/sharp_nht.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SHARP - code to track nexthops
  * Copyright (C) Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __SHARP_NHT_H__
 #define __SHARP_NHT_H__
diff --git a/sharpd/sharp_vty.c b/sharpd/sharp_vty.c
index 0cedd2baf..77b562d6a 100644
--- a/sharpd/sharp_vty.c
+++ b/sharpd/sharp_vty.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SHARP - vty code
  * Copyright (C) Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/sharpd/sharp_vty.h b/sharpd/sharp_vty.h
index 0d1327259..460e4f518 100644
--- a/sharpd/sharp_vty.h
+++ b/sharpd/sharp_vty.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VTY library for SHARP
  * Copyright (C) Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __SHARP_VTY_H__
 #define __SHARP_VTY_H__
diff --git a/sharpd/sharp_zebra.c b/sharpd/sharp_zebra.c
index fcea484b3..df06f5537 100644
--- a/sharpd/sharp_zebra.c
+++ b/sharpd/sharp_zebra.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra connect code.
  * Copyright (C) Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/sharpd/sharp_zebra.h b/sharpd/sharp_zebra.h
index 8de14ce5a..cf8689799 100644
--- a/sharpd/sharp_zebra.h
+++ b/sharpd/sharp_zebra.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra connect library for SHARP
  * Copyright (C) Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __SHARP_ZEBRA_H__
 #define __SHARP_ZEBRA_H__
diff --git a/staticd/static_bfd.c b/staticd/static_bfd.c
index fc8b518e1..ccf7d206f 100644
--- a/staticd/static_bfd.c
+++ b/staticd/static_bfd.c
@@ -1,23 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Static daemon BFD integration.
  *
  * Copyright (C) 2020-2022 Network Device Education Foundation, Inc. ("NetDEF")
  *                         Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301 USA.
  */
 
 #include <zebra.h>
diff --git a/staticd/static_debug.c b/staticd/static_debug.c
index 847e7d61a..a65752c95 100644
--- a/staticd/static_debug.c
+++ b/staticd/static_debug.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Staticd debug related functions
  * Copyright (C) 2019 Volta Networks Inc.
  * Mark Stapp
- *
- * This file is part of FRRouting (FRR).
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/staticd/static_debug.h b/staticd/static_debug.h
index 129c09668..c9100680f 100644
--- a/staticd/static_debug.h
+++ b/staticd/static_debug.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Staticd debug related functions
  * Copyright (C) 2019 Volta Networks Inc.
  * Mark Stapp
- *
- * This file is part of FRRouting (FRR).
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _STATIC_DEBUG_H
diff --git a/staticd/static_main.c b/staticd/static_main.c
index 79686158c..bc501b3d6 100644
--- a/staticd/static_main.c
+++ b/staticd/static_main.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * STATICd - main code
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/staticd/static_nb.c b/staticd/static_nb.c
index 68d9ba97b..d8b5b167c 100644
--- a/staticd/static_nb.c
+++ b/staticd/static_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018        Vmware
  *                           Vishal Dhingra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/staticd/static_nb.h b/staticd/static_nb.h
index 96c9f8d9b..ce3644076 100644
--- a/staticd/static_nb.h
+++ b/staticd/static_nb.h
@@ -1,19 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018        Vmware
  *                           Vishal Dhingra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _FRR_STATIC_NB_H_
 #define _FRR_STATIC_NB_H_
diff --git a/staticd/static_nb_config.c b/staticd/static_nb_config.c
index cbb5b8234..01cd281d9 100644
--- a/staticd/static_nb_config.c
+++ b/staticd/static_nb_config.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018        Vmware
  *                           Vishal Dhingra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/staticd/static_nht.c b/staticd/static_nht.c
index 1d87a83c9..ebc5ea16c 100644
--- a/staticd/static_nht.c
+++ b/staticd/static_nht.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Static NHT code.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/staticd/static_nht.h b/staticd/static_nht.h
index c29acc32e..74f4401e4 100644
--- a/staticd/static_nht.h
+++ b/staticd/static_nht.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Static NHT header.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __STATIC_NHT_H__
 #define __STATIC_NHT_H__
diff --git a/staticd/static_routes.c b/staticd/static_routes.c
index 0c39058a8..3399686a9 100644
--- a/staticd/static_routes.c
+++ b/staticd/static_routes.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * STATICd - route code
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/staticd/static_routes.h b/staticd/static_routes.h
index 2332cfd2b..eb7953db2 100644
--- a/staticd/static_routes.h
+++ b/staticd/static_routes.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * STATICd - static routes header
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __STATIC_ROUTES_H__
 #define __STATIC_ROUTES_H__
diff --git a/staticd/static_vrf.c b/staticd/static_vrf.c
index 37cd199c4..a67dce200 100644
--- a/staticd/static_vrf.c
+++ b/staticd/static_vrf.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * STATICd - vrf code
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/staticd/static_vrf.h b/staticd/static_vrf.h
index 885246bfa..8f55775d3 100644
--- a/staticd/static_vrf.h
+++ b/staticd/static_vrf.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * STATICd - vrf header
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __STATIC_VRF_H__
 #define __STATIC_VRF_H__
diff --git a/staticd/static_vty.c b/staticd/static_vty.c
index f9c88f8be..d87ca16c6 100644
--- a/staticd/static_vty.c
+++ b/staticd/static_vty.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * STATICd - vty code
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/staticd/static_vty.h b/staticd/static_vty.h
index 84a359593..77e52b5bd 100644
--- a/staticd/static_vty.h
+++ b/staticd/static_vty.h
@@ -1,20 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * STATICd - vty header
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __STATIC_VTY_H__
 #define __STATIC_VTY_H__
diff --git a/staticd/static_zebra.c b/staticd/static_zebra.c
index 85e4b1c03..f220b476f 100644
--- a/staticd/static_zebra.c
+++ b/staticd/static_zebra.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra connect code.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/staticd/static_zebra.h b/staticd/static_zebra.h
index 1cf13dcbb..5f21d6c38 100644
--- a/staticd/static_zebra.h
+++ b/staticd/static_zebra.h
@@ -1,20 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra connect library for staticd
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
  */
 #ifndef __STATIC_ZEBRA_H__
 #define __STATIC_ZEBRA_H__
diff --git a/tests/bgpd/test_aspath.c b/tests/bgpd/test_aspath.c
index ef1fcf5ce..8806bcd8f 100644
--- a/tests/bgpd/test_aspath.c
+++ b/tests/bgpd/test_aspath.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2005 Sun Microsystems, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/bgpd/test_bgp_table.c b/tests/bgpd/test_bgp_table.c
index e899e5b35..bed86f5ac 100644
--- a/tests/bgpd/test_bgp_table.c
+++ b/tests/bgpd/test_bgp_table.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP Routing table range lookup test
  * Copyright (C) 2012 OSR.
@@ -5,20 +6,6 @@
  * Hamburg
  *
  * This file is part of FRRouting
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/bgpd/test_capability.c b/tests/bgpd/test_capability.c
index 51792825d..01b0740b8 100644
--- a/tests/bgpd/test_capability.c
+++ b/tests/bgpd/test_capability.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2007 Sun Microsystems, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/bgpd/test_ecommunity.c b/tests/bgpd/test_ecommunity.c
index 7147e3faf..bb360722c 100644
--- a/tests/bgpd/test_ecommunity.c
+++ b/tests/bgpd/test_ecommunity.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2007 Sun Microsystems, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/tests/bgpd/test_mp_attr.c b/tests/bgpd/test_mp_attr.c
index c5ce5d3cd..3abf7bd14 100644
--- a/tests/bgpd/test_mp_attr.c
+++ b/tests/bgpd/test_mp_attr.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2008 Sun Microsystems, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/bgpd/test_mpath.c b/tests/bgpd/test_mpath.c
index c20403f67..366280597 100644
--- a/tests/bgpd/test_mpath.c
+++ b/tests/bgpd/test_mpath.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP Multipath Unit Test
  * Copyright (C) 2010 Google Inc.
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/bgpd/test_packet.c b/tests/bgpd/test_packet.c
index 2ce8b561b..1a2d21ad2 100644
--- a/tests/bgpd/test_packet.c
+++ b/tests/bgpd/test_packet.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2017 Cumulus Networks Inc.
  *                    Donald Sharp
  *
  * This file is part of FRR
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/bgpd/test_peer_attr.c b/tests/bgpd/test_peer_attr.c
index cdedd0c90..090fb9a9f 100644
--- a/tests/bgpd/test_peer_attr.c
+++ b/tests/bgpd/test_peer_attr.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * BGP Peer Attribute Unit Tests
  * Copyright (C) 2018  Pascal Mathis
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/tests/helpers/c/main.c b/tests/helpers/c/main.c
index ca6b18ecd..bb8acd2c4 100644
--- a/tests/helpers/c/main.c
+++ b/tests/helpers/c/main.c
@@ -1,19 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/helpers/c/prng.c b/tests/helpers/c/prng.c
index e2173d451..612c43344 100644
--- a/tests/helpers/c/prng.c
+++ b/tests/helpers/c/prng.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Very simple prng to allow for randomized tests with reproducable
  * results.
@@ -7,20 +8,6 @@
  * Copyright (C) 2017 Christian Franke
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/helpers/c/prng.h b/tests/helpers/c/prng.h
index 23f702b07..6b10bde60 100644
--- a/tests/helpers/c/prng.h
+++ b/tests/helpers/c/prng.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Very simple prng to allow for randomized tests with reproducable
  * results.
@@ -6,20 +7,6 @@
  * Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC")
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef _PRNG_H
 #define _PRNG_H
diff --git a/tests/helpers/c/tests.h b/tests/helpers/c/tests.h
index 53e9c7844..40f17ccc9 100644
--- a/tests/helpers/c/tests.h
+++ b/tests/helpers/c/tests.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Test wrappers common header file
  *
@@ -5,20 +6,6 @@
  *                    for Open Source Routing./ NetDEF, Inc.
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _QUAGGA_TESTS_H
diff --git a/tests/helpers/python/frrsix.py b/tests/helpers/python/frrsix.py
index df737d92e..8af964761 100644
--- a/tests/helpers/python/frrsix.py
+++ b/tests/helpers/python/frrsix.py
@@ -1,24 +1,7 @@
+# SPDX-License-Identifier: MIT
 #
 # Copyright (c) 2010-2017 Benjamin Peterson
 #
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
-#
 
 #
 # This code is taken from the six python2 to python3 compatibility module
diff --git a/tests/helpers/python/frrtest.py b/tests/helpers/python/frrtest.py
index 584fa9037..3faa2a6f1 100644
--- a/tests/helpers/python/frrtest.py
+++ b/tests/helpers/python/frrtest.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # Test helpers for FRR
 #
@@ -6,21 +7,6 @@
 #
 # This file is part of FRRouting (FRR)
 #
-# FRR is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the
-# Free Software Foundation; either version 2, or (at your option) any
-# later version.
-#
-# FRR is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with FRR; see the file COPYING.  If not, write to the Free
-# Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-# 02111-1307, USA.
-#
 
 import subprocess
 import sys
diff --git a/tests/isisd/test_common.c b/tests/isisd/test_common.c
index ade357353..0f37752ce 100644
--- a/tests/isisd/test_common.c
+++ b/tests/isisd/test_common.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/isisd/test_common.h b/tests/isisd/test_common.h
index 3359a893a..9b83b30ba 100644
--- a/tests/isisd/test_common.h
+++ b/tests/isisd/test_common.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _COMMON_ISIS_H
diff --git a/tests/isisd/test_isis_spf.c b/tests/isisd/test_isis_spf.c
index 971aba4c4..0cccf0567 100644
--- a/tests/isisd/test_isis_spf.c
+++ b/tests/isisd/test_isis_spf.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/isisd/test_topologies.c b/tests/isisd/test_topologies.c
index b3e500a33..a0ac76896 100644
--- a/tests/isisd/test_topologies.c
+++ b/tests/isisd/test_topologies.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/cli/common_cli.c b/tests/lib/cli/common_cli.c
index 7c9febe2c..29dad7d80 100644
--- a/tests/lib/cli/common_cli.c
+++ b/tests/lib/cli/common_cli.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * generic CLI test helper functions
  *
  * Copyright (C) 2015 by David Lamparter,
  *                   for Open Source Routing / NetDEF, Inc.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/cli/common_cli.h b/tests/lib/cli/common_cli.h
index 6660b27ef..7ef4d860b 100644
--- a/tests/lib/cli/common_cli.h
+++ b/tests/lib/cli/common_cli.h
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * generic CLI test helper functions
  *
  * Copyright (C) 2015 by David Lamparter,
  *                   for Open Source Routing / NetDEF, Inc.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _COMMON_CLI_H
diff --git a/tests/lib/cli/test_cli.c b/tests/lib/cli/test_cli.c
index f8d74018d..031473515 100644
--- a/tests/lib/cli/test_cli.c
+++ b/tests/lib/cli/test_cli.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * CLI/command dummy handling tester
  *
  * Copyright (C) 2015 by David Lamparter,
  *                   for Open Source Routing / NetDEF, Inc.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/cli/test_commands.c b/tests/lib/cli/test_commands.c
index a00f80073..54db79575 100644
--- a/tests/lib/cli/test_commands.c
+++ b/tests/lib/cli/test_commands.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Test code for lib/command.c
  *
@@ -10,20 +11,6 @@
  *
  * The output is currently not validated but only logged. It can
  * be diffed to find regressions between versions.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #define REALLY_NEED_PLAIN_GETOPT 1
diff --git a/tests/lib/cxxcompat.c b/tests/lib/cxxcompat.c
index 2589fca61..7aab88eeb 100644
--- a/tests/lib/cxxcompat.c
+++ b/tests/lib/cxxcompat.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * C++ compatibility compile-time smoketest
  * Copyright (C) 2019  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #define test__cplusplus
diff --git a/tests/lib/fuzz_zlog.c b/tests/lib/fuzz_zlog.c
index 14c857118..ad9677a71 100644
--- a/tests/lib/fuzz_zlog.c
+++ b/tests/lib/fuzz_zlog.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * zlog fuzzer target.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/fuzz_zlog_inputs.py b/tests/lib/fuzz_zlog_inputs.py
index 74f3286c5..ec3f8ae0a 100644
--- a/tests/lib/fuzz_zlog_inputs.py
+++ b/tests/lib/fuzz_zlog_inputs.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 # zlog fuzz-tester input generator
 #
 # Copyright (C) 2021  David Lamparter for NetDEF, Inc.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 from itertools import chain
 import struct
diff --git a/tests/lib/northbound/test_oper_data.c b/tests/lib/northbound/test_oper_data.c
index 08eb0d527..3abda75f4 100644
--- a/tests/lib/northbound/test_oper_data.c
+++ b/tests/lib/northbound/test_oper_data.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_assert.c b/tests/lib/test_assert.c
index a4535651d..d68ee8a81 100644
--- a/tests/lib/test_assert.c
+++ b/tests/lib/test_assert.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Quick test for assert()
  * Copyright (C) 2021  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/tests/lib/test_atomlist.c b/tests/lib/test_atomlist.c
index 83dd9f2c5..b50216cf9 100644
--- a/tests/lib/test_atomlist.c
+++ b/tests/lib/test_atomlist.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2016-2018  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/tests/lib/test_buffer.c b/tests/lib/test_buffer.c
index 7fb9a769d..9f501f4e3 100644
--- a/tests/lib/test_buffer.c
+++ b/tests/lib/test_buffer.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2004 Paul Jakma
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_checksum.c b/tests/lib/test_checksum.c
index 9a7f2b147..fcb79ee28 100644
--- a/tests/lib/test_checksum.c
+++ b/tests/lib/test_checksum.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2008 Sun Microsystems, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_frrlua.c b/tests/lib/test_frrlua.c
index fb6b77c0f..4f492db5b 100644
--- a/tests/lib/test_frrlua.c
+++ b/tests/lib/test_frrlua.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * frrlua unit tests
  * Copyright (C) 2021  Donald Lee
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_frrscript.c b/tests/lib/test_frrscript.c
index 4c5d8d292..7d4746cf3 100644
--- a/tests/lib/test_frrscript.c
+++ b/tests/lib/test_frrscript.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * frrscript unit tests
  * Copyright (C) 2021  Donald Lee
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_graph.c b/tests/lib/test_graph.c
index 2801c48bc..86af02a4e 100644
--- a/tests/lib/test_graph.c
+++ b/tests/lib/test_graph.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Test graph data structure.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  *                     Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include <graph.h>
diff --git a/tests/lib/test_grpc.cpp b/tests/lib/test_grpc.cpp
index 88372f45a..282161c3d 100644
--- a/tests/lib/test_grpc.cpp
+++ b/tests/lib/test_grpc.cpp
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * May 16 2021, Christian Hopps <chopps@labn.net>
  *
  * Copyright (c) 2021, LabN Consulting, L.L.C
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <time.h>
diff --git a/tests/lib/test_heavy.c b/tests/lib/test_heavy.c
index afc7a08e6..2d54fe6c6 100644
--- a/tests/lib/test_heavy.c
+++ b/tests/lib/test_heavy.c
@@ -1,19 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* This programme shows the effects of 'heavy' long-running functions
diff --git a/tests/lib/test_heavy_thread.c b/tests/lib/test_heavy_thread.c
index 466f9a7d9..afbd20545 100644
--- a/tests/lib/test_heavy_thread.c
+++ b/tests/lib/test_heavy_thread.c
@@ -1,19 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* This programme shows the effects of 'heavy' long-running functions
diff --git a/tests/lib/test_heavy_wq.c b/tests/lib/test_heavy_wq.c
index be47ef4bb..9b2cfa573 100644
--- a/tests/lib/test_heavy_wq.c
+++ b/tests/lib/test_heavy_wq.c
@@ -1,19 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* This programme shows the effects of 'heavy' long-running functions
diff --git a/tests/lib/test_memory.c b/tests/lib/test_memory.c
index 9f04304a2..e4423b0b5 100644
--- a/tests/lib/test_memory.c
+++ b/tests/lib/test_memory.c
@@ -1,19 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_nexthop.c b/tests/lib/test_nexthop.c
index 7cf687dff..84732d6af 100644
--- a/tests/lib/test_nexthop.c
+++ b/tests/lib/test_nexthop.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Nexthop module test.
  *
  * Copyright (C) 2021 by Volta Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_nexthop_iter.c b/tests/lib/test_nexthop_iter.c
index a6995d13e..2bb0b1233 100644
--- a/tests/lib/test_nexthop_iter.c
+++ b/tests/lib/test_nexthop_iter.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Recursive Nexthop Iterator test.
  * This tests the ALL_NEXTHOPS macro.
@@ -6,20 +7,6 @@
  * Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC")
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_ntop.c b/tests/lib/test_ntop.c
index 0a55ecddb..d3570479a 100644
--- a/tests/lib/test_ntop.c
+++ b/tests/lib/test_ntop.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * frr_inet_ntop() unit test
  * Copyright (C) 2019  David Lamparter
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/tests/lib/test_plist.c b/tests/lib/test_plist.c
index ee7a9ebf3..bfad766c7 100644
--- a/tests/lib/test_plist.c
+++ b/tests/lib/test_plist.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Simple prefix list querying tool
  *
  * Copyright (C) 2021 by David Lamparter,
  *                   for Open Source Routing / NetDEF, Inc.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_prefix2str.c b/tests/lib/test_prefix2str.c
index cbfc20a79..9d837eede 100644
--- a/tests/lib/test_prefix2str.c
+++ b/tests/lib/test_prefix2str.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * prefix2str() unit test
  * Copyright (C) 2019  David Lamparter
  * Portions:
  *     Copyright (C) 2019  Cumulus Networks, Inc
  *     Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/tests/lib/test_printfrr.c b/tests/lib/test_printfrr.c
index 59d08ae82..9cabae8f2 100644
--- a/tests/lib/test_printfrr.c
+++ b/tests/lib/test_printfrr.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * printfrr() unit test
  * Copyright (C) 2019  David Lamparter
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/tests/lib/test_privs.c b/tests/lib/test_privs.c
index c06ebbeb3..d7bc0b315 100644
--- a/tests/lib/test_privs.c
+++ b/tests/lib/test_privs.c
@@ -1,19 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_resolver.c b/tests/lib/test_resolver.c
index 6a582ccea..b4d8992b9 100644
--- a/tests/lib/test_resolver.c
+++ b/tests/lib/test_resolver.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * FRR c-ares integration test
  * Copyright (C) 2021  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /* this test is not run automatically since tests MUST NOT rely on any outside
diff --git a/tests/lib/test_ringbuf.c b/tests/lib/test_ringbuf.c
index 4ac62940b..0d7fed75e 100644
--- a/tests/lib/test_ringbuf.c
+++ b/tests/lib/test_ringbuf.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Circular buffer tests.
  * Copyright (C) 2017  Cumulus Networks
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include <memory.h>
diff --git a/tests/lib/test_segv.c b/tests/lib/test_segv.c
index 92c9f7a2e..8532da7c2 100644
--- a/tests/lib/test_segv.c
+++ b/tests/lib/test_segv.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SEGV / backtrace handling test.
  *
@@ -7,20 +8,6 @@
  * Copyright (C) 2013 by Internet Systems Consortium, Inc. ("ISC")
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_seqlock.c b/tests/lib/test_seqlock.c
index 768307d56..288d4a8c2 100644
--- a/tests/lib/test_seqlock.c
+++ b/tests/lib/test_seqlock.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * basic test for seqlock
  *
  * Copyright (C) 2015  David Lamparter
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/tests/lib/test_sig.c b/tests/lib/test_sig.c
index 9165f1850..897e004b4 100644
--- a/tests/lib/test_sig.c
+++ b/tests/lib/test_sig.c
@@ -1,19 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_skiplist.c b/tests/lib/test_skiplist.c
index 2f9ca5eae..6af7ac529 100644
--- a/tests/lib/test_skiplist.c
+++ b/tests/lib/test_skiplist.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (c) 2021, LabN Consulting, L.L.C
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_srcdest_table.c b/tests/lib/test_srcdest_table.c
index 2d8f024d1..de0482d69 100644
--- a/tests/lib/test_srcdest_table.c
+++ b/tests/lib/test_srcdest_table.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Test srcdest table for correctness.
  *
@@ -5,20 +6,6 @@
  *                       Open Source Routing / NetDEF Inc.
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_stream.c b/tests/lib/test_stream.c
index a45c2b4d5..015dc41db 100644
--- a/tests/lib/test_stream.c
+++ b/tests/lib/test_stream.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Simple stream test.
  *
  * Copyright (C) 2006 Sun Microsystems, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_table.c b/tests/lib/test_table.c
index cef93ad0c..41d700395 100644
--- a/tests/lib/test_table.c
+++ b/tests/lib/test_table.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Routing table test
  * Copyright (C) 2012 OSR.
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_timer_correctness.c b/tests/lib/test_timer_correctness.c
index 475fabd2d..37eb4939a 100644
--- a/tests/lib/test_timer_correctness.c
+++ b/tests/lib/test_timer_correctness.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Test program to verify that scheduled timers are executed in the
  * correct order.
@@ -6,20 +7,6 @@
  * Copyright (C) 2013 by Internet Systems Consortium, Inc. ("ISC")
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_timer_performance.c b/tests/lib/test_timer_performance.c
index c1dd07b89..21976e8d3 100644
--- a/tests/lib/test_timer_performance.c
+++ b/tests/lib/test_timer_performance.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Test program which measures the time it takes to schedule and
  * remove timers.
@@ -6,20 +7,6 @@
  * Copyright (C) 2013 by Internet Systems Consortium, Inc. ("ISC")
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_ttable.c b/tests/lib/test_ttable.c
index 43b8adcb9..562ddf9d6 100644
--- a/tests/lib/test_ttable.c
+++ b/tests/lib/test_ttable.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ASCII table generator.
  * Copyright (C) 2017  Cumulus Networks
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include <termtable.h>
diff --git a/tests/lib/test_typelist.c b/tests/lib/test_typelist.c
index 6e6965849..070a30433 100644
--- a/tests/lib/test_typelist.c
+++ b/tests/lib/test_typelist.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2016-2018  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/tests/lib/test_typelist.h b/tests/lib/test_typelist.h
index feb42909a..91528139b 100644
--- a/tests/lib/test_typelist.h
+++ b/tests/lib/test_typelist.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2019  David Lamparter, for NetDEF, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 /* C++ called, they want their templates back */
diff --git a/tests/lib/test_versioncmp.c b/tests/lib/test_versioncmp.c
index bb819e36f..84ae06e4d 100644
--- a/tests/lib/test_versioncmp.c
+++ b/tests/lib/test_versioncmp.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * frr_version_cmp() tests
  * Copyright (C) 2018  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include <defaults.h>
diff --git a/tests/lib/test_xref.c b/tests/lib/test_xref.c
index aa179141a..fca0d47f3 100644
--- a/tests/lib/test_xref.c
+++ b/tests/lib/test_xref.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * xref tests
  * Copyright (C) 2020  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/lib/test_zlog.c b/tests/lib/test_zlog.c
index 48fa7bce9..95d90569f 100644
--- a/tests/lib/test_zlog.c
+++ b/tests/lib/test_zlog.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zlog tests.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  *                     Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include <memory.h>
diff --git a/tests/lib/test_zmq.c b/tests/lib/test_zmq.c
index c411de725..59a596e1c 100644
--- a/tests/lib/test_zmq.c
+++ b/tests/lib/test_zmq.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * ZeroMQ event test
  * Copyright (C) 2017  David Lamparter, for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/ospf6d/test_lsdb.c b/tests/ospf6d/test_lsdb.c
index c5bdcd3d1..4bc6e869b 100644
--- a/tests/ospf6d/test_lsdb.c
+++ b/tests/ospf6d/test_lsdb.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * CLI/command dummy handling tester
  *
  * Copyright (C) 2015 by David Lamparter,
  *                   for Open Source Routing / NetDEF, Inc.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/tests/topotests/all_protocol_startup/test_all_protocol_startup.py b/tests/topotests/all_protocol_startup/test_all_protocol_startup.py
index 2d3e2a759..fe84d496a 100644
--- a/tests/topotests/all_protocol_startup/test_all_protocol_startup.py
+++ b/tests/topotests/all_protocol_startup/test_all_protocol_startup.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_all_protocol_startup.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_all_protocol_startup.py: Test of all protocols at same time
diff --git a/tests/topotests/analyze.py b/tests/topotests/analyze.py
index 108bd1b49..360c9cf1e 100755
--- a/tests/topotests/analyze.py
+++ b/tests/topotests/analyze.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # July 9 2021, Christian Hopps <chopps@labn.net>
 #
 # Copyright (c) 2021, LabN Consulting, L.L.C.
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-#
 import argparse
 import glob
 import logging
diff --git a/tests/topotests/babel_topo1/test_babel_topo1.py b/tests/topotests/babel_topo1/test_babel_topo1.py
index 12f81042e..6a0297a7e 100644
--- a/tests/topotests/babel_topo1/test_babel_topo1.py
+++ b/tests/topotests/babel_topo1/test_babel_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_babel_topo1.py
@@ -7,20 +8,6 @@
 # Cumulus Networks, Inc.
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_babel_topo1.py: Testing BABEL
diff --git a/tests/topotests/bfd_bgp_cbit_topo3/test_bfd_bgp_cbit_topo3.py b/tests/topotests/bfd_bgp_cbit_topo3/test_bfd_bgp_cbit_topo3.py
index 92432669c..475c4b1aa 100644
--- a/tests/topotests/bfd_bgp_cbit_topo3/test_bfd_bgp_cbit_topo3.py
+++ b/tests/topotests/bfd_bgp_cbit_topo3/test_bfd_bgp_cbit_topo3.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bfd_bgp_cbit_topo3.py
 #
 # Copyright (c) 2019 6WIND
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bfd_bgp_cbit_topo3.py: Test the FRR BFD daemon with multihop and BGP
diff --git a/tests/topotests/bfd_isis_topo1/test_bfd_isis_topo1.py b/tests/topotests/bfd_isis_topo1/test_bfd_isis_topo1.py
index 27a441932..09e69144f 100644
--- a/tests/topotests/bfd_isis_topo1/test_bfd_isis_topo1.py
+++ b/tests/topotests/bfd_isis_topo1/test_bfd_isis_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bfd_isis_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bfd_isis_topo1.py:
diff --git a/tests/topotests/bfd_ospf_topo1/test_bfd_ospf_topo1.py b/tests/topotests/bfd_ospf_topo1/test_bfd_ospf_topo1.py
index 93a233929..b9e8b73c1 100755
--- a/tests/topotests/bfd_ospf_topo1/test_bfd_ospf_topo1.py
+++ b/tests/topotests/bfd_ospf_topo1/test_bfd_ospf_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bfd_ospf_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bfd_ospf_topo1.py:
diff --git a/tests/topotests/bfd_profiles_topo1/test_bfd_profiles_topo1.py b/tests/topotests/bfd_profiles_topo1/test_bfd_profiles_topo1.py
index 169f90abf..78841b34e 100644
--- a/tests/topotests/bfd_profiles_topo1/test_bfd_profiles_topo1.py
+++ b/tests/topotests/bfd_profiles_topo1/test_bfd_profiles_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bfd_profiles_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bfd_profiles_topo1.py: Test the FRR BFD profile protocol integration.
diff --git a/tests/topotests/bfd_topo1/test_bfd_topo1.py b/tests/topotests/bfd_topo1/test_bfd_topo1.py
index 955d54f30..1b774931b 100644
--- a/tests/topotests/bfd_topo1/test_bfd_topo1.py
+++ b/tests/topotests/bfd_topo1/test_bfd_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bfd_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2018 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bfd_topo1.py: Test the FRR BFD daemon.
diff --git a/tests/topotests/bfd_topo2/test_bfd_topo2.py b/tests/topotests/bfd_topo2/test_bfd_topo2.py
index a9b9358ef..b720218e9 100644
--- a/tests/topotests/bfd_topo2/test_bfd_topo2.py
+++ b/tests/topotests/bfd_topo2/test_bfd_topo2.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bfd_topo2.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bfd_topo2.py: Test the FRR BFD daemon with multihop and BGP
diff --git a/tests/topotests/bfd_topo3/test_bfd_topo3.py b/tests/topotests/bfd_topo3/test_bfd_topo3.py
index ea9f981d9..c0dc052a3 100644
--- a/tests/topotests/bfd_topo3/test_bfd_topo3.py
+++ b/tests/topotests/bfd_topo3/test_bfd_topo3.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bfd_topo3.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bfd_topo3.py: Test the FRR BFD daemon multi hop.
diff --git a/tests/topotests/bfd_vrf_topo1/test_bfd_vrf_topo1.py b/tests/topotests/bfd_vrf_topo1/test_bfd_vrf_topo1.py
index acb86ea7f..a532f3a2d 100644
--- a/tests/topotests/bfd_vrf_topo1/test_bfd_vrf_topo1.py
+++ b/tests/topotests/bfd_vrf_topo1/test_bfd_vrf_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bfd_vrf_topo1.py
@@ -8,20 +9,6 @@
 # Network Device Education Foundation, Inc. ("NetDEF")
 # Copyright (c) 2019 by 6WIND
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bfd_vrf_topo1.py: Test the FRR BFD daemon.
diff --git a/tests/topotests/bfd_vrflite_topo1/test_bfd_vrflite_topo1.py b/tests/topotests/bfd_vrflite_topo1/test_bfd_vrflite_topo1.py
index b7afb8e3b..30f4a2f9b 100644
--- a/tests/topotests/bfd_vrflite_topo1/test_bfd_vrflite_topo1.py
+++ b/tests/topotests/bfd_vrflite_topo1/test_bfd_vrflite_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bfd_vrflite_topo1.py
@@ -8,20 +9,6 @@
 # Network Device Education Foundation, Inc. ("NetDEF")
 # Copyright (c) 2022 by 6WIND
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bfd_vrflite_topo1.py: Test the FRR BFD daemon.
diff --git a/tests/topotests/bgp_accept_own/test_bgp_accept_own.py b/tests/topotests/bgp_accept_own/test_bgp_accept_own.py
index daef6dcd5..d294da093 100644
--- a/tests/topotests/bgp_accept_own/test_bgp_accept_own.py
+++ b/tests/topotests/bgp_accept_own/test_bgp_accept_own.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 
diff --git a/tests/topotests/bgp_aggregate_address_matching_med/test_bgp_aggregate_address_matching_med.py b/tests/topotests/bgp_aggregate_address_matching_med/test_bgp_aggregate_address_matching_med.py
index edf50dc9e..5a4a5fb65 100644
--- a/tests/topotests/bgp_aggregate_address_matching_med/test_bgp_aggregate_address_matching_med.py
+++ b/tests/topotests/bgp_aggregate_address_matching_med/test_bgp_aggregate_address_matching_med.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if aggregate-address command works fine when suppressing summary-only
diff --git a/tests/topotests/bgp_aggregate_address_origin/test_bgp_aggregate-address_origin.py b/tests/topotests/bgp_aggregate_address_origin/test_bgp_aggregate-address_origin.py
index 0d01fa2ad..739685d41 100644
--- a/tests/topotests/bgp_aggregate_address_origin/test_bgp_aggregate-address_origin.py
+++ b/tests/topotests/bgp_aggregate_address_origin/test_bgp_aggregate-address_origin.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_aggregate-address_origin.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 bgp_aggregate-address_origin.py:
diff --git a/tests/topotests/bgp_aggregate_address_route_map/test_bgp_aggregate-address_route-map.py b/tests/topotests/bgp_aggregate_address_route_map/test_bgp_aggregate-address_route-map.py
index df2059456..cec06920c 100644
--- a/tests/topotests/bgp_aggregate_address_route_map/test_bgp_aggregate-address_route-map.py
+++ b/tests/topotests/bgp_aggregate_address_route_map/test_bgp_aggregate-address_route-map.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_aggregate-address_route-map.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 bgp_aggregate-address_route-map.py:
diff --git a/tests/topotests/bgp_aggregate_address_topo1/test_bgp_aggregate_address_topo1.py b/tests/topotests/bgp_aggregate_address_topo1/test_bgp_aggregate_address_topo1.py
index f506792c4..370d01e52 100644
--- a/tests/topotests/bgp_aggregate_address_topo1/test_bgp_aggregate_address_topo1.py
+++ b/tests/topotests/bgp_aggregate_address_topo1/test_bgp_aggregate_address_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_aggregate_address_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test BGP aggregate address features.
diff --git a/tests/topotests/bgp_aggregator_zero/test_bgp_aggregator_zero.py b/tests/topotests/bgp_aggregator_zero/test_bgp_aggregator_zero.py
index ea71c82d8..d9ef3e1ce 100644
--- a/tests/topotests/bgp_aggregator_zero/test_bgp_aggregator_zero.py
+++ b/tests/topotests/bgp_aggregator_zero/test_bgp_aggregator_zero.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if BGP UPDATE with AGGREGATOR AS attribute with value zero (0)
diff --git a/tests/topotests/bgp_aigp/test_bgp_aigp.py b/tests/topotests/bgp_aigp/test_bgp_aigp.py
index 9fa80c6da..b7ea40dd4 100644
--- a/tests/topotests/bgp_aigp/test_bgp_aigp.py
+++ b/tests/topotests/bgp_aigp/test_bgp_aigp.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 r7 sets aigp-metric for 10.0.0.71/32 to 71, and 72 for 10.0.0.72/32.
diff --git a/tests/topotests/bgp_as_allow_in/test_bgp_as_allow_in.py b/tests/topotests/bgp_as_allow_in/test_bgp_as_allow_in.py
index 7ded0ce8b..c49a2e538 100644
--- a/tests/topotests/bgp_as_allow_in/test_bgp_as_allow_in.py
+++ b/tests/topotests/bgp_as_allow_in/test_bgp_as_allow_in.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test bgp allowas-in functionality:
diff --git a/tests/topotests/bgp_as_override/test_bgp_as_override.py b/tests/topotests/bgp_as_override/test_bgp_as_override.py
index 40085cd7e..7cb4f81cf 100644
--- a/tests/topotests/bgp_as_override/test_bgp_as_override.py
+++ b/tests/topotests/bgp_as_override/test_bgp_as_override.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 """
diff --git a/tests/topotests/bgp_as_wide_bgp_identifier/test_bgp_as_wide_bgp_identifier.py b/tests/topotests/bgp_as_wide_bgp_identifier/test_bgp_as_wide_bgp_identifier.py
index 571e28cf7..5c09a6b0e 100644
--- a/tests/topotests/bgp_as_wide_bgp_identifier/test_bgp_as_wide_bgp_identifier.py
+++ b/tests/topotests/bgp_as_wide_bgp_identifier/test_bgp_as_wide_bgp_identifier.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_as_wide_bgp_identifier.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 rfc6286: Autonomous-System-Wide Unique BGP Identifier for BGP-4
diff --git a/tests/topotests/bgp_aspath_zero/test_bgp_aspath_zero.py b/tests/topotests/bgp_aspath_zero/test_bgp_aspath_zero.py
index 14689d737..0f1a08308 100644
--- a/tests/topotests/bgp_aspath_zero/test_bgp_aspath_zero.py
+++ b/tests/topotests/bgp_aspath_zero/test_bgp_aspath_zero.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if BGP UPDATE with AS-PATH attribute with value zero (0)
diff --git a/tests/topotests/bgp_auth/bgp_auth_common.py b/tests/topotests/bgp_auth/bgp_auth_common.py
index 14e4d05c0..824498ef9 100644
--- a/tests/topotests/bgp_auth/bgp_auth_common.py
+++ b/tests/topotests/bgp_auth/bgp_auth_common.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_auth.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_auth.py: Test BGP Md5 Authentication
diff --git a/tests/topotests/bgp_auth/test_bgp_auth1.py b/tests/topotests/bgp_auth/test_bgp_auth1.py
index 5be07cf8a..566d391f7 100644
--- a/tests/topotests/bgp_auth/test_bgp_auth1.py
+++ b/tests/topotests/bgp_auth/test_bgp_auth1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_auth.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_auth.py: Test BGP Md5 Authentication
diff --git a/tests/topotests/bgp_auth/test_bgp_auth2.py b/tests/topotests/bgp_auth/test_bgp_auth2.py
index 2b37e8086..0e9942a22 100644
--- a/tests/topotests/bgp_auth/test_bgp_auth2.py
+++ b/tests/topotests/bgp_auth/test_bgp_auth2.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_auth.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_auth.py: Test BGP Md5 Authentication
diff --git a/tests/topotests/bgp_auth/test_bgp_auth3.py b/tests/topotests/bgp_auth/test_bgp_auth3.py
index 220f350d8..99a8953b3 100644
--- a/tests/topotests/bgp_auth/test_bgp_auth3.py
+++ b/tests/topotests/bgp_auth/test_bgp_auth3.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_auth.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_auth.py: Test BGP Md5 Authentication
diff --git a/tests/topotests/bgp_auth/test_bgp_auth4.py b/tests/topotests/bgp_auth/test_bgp_auth4.py
index 2b7a35548..dffef0eef 100644
--- a/tests/topotests/bgp_auth/test_bgp_auth4.py
+++ b/tests/topotests/bgp_auth/test_bgp_auth4.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_auth.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_auth.py: Test BGP Md5 Authentication
diff --git a/tests/topotests/bgp_basic_functionality_topo1/test_bgp_basic_functionality.py b/tests/topotests/bgp_basic_functionality_topo1/test_bgp_basic_functionality.py
index 42b9b8adb..c97fc5f0e 100644
--- a/tests/topotests/bgp_basic_functionality_topo1/test_bgp_basic_functionality.py
+++ b/tests/topotests/bgp_basic_functionality_topo1/test_bgp_basic_functionality.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP basic functionality:
diff --git a/tests/topotests/bgp_bfd_down_cease_notification/test_bgp_bfd_down_cease_notification.py b/tests/topotests/bgp_bfd_down_cease_notification/test_bgp_bfd_down_cease_notification.py
index a9b43e234..0bc0306d7 100644
--- a/tests/topotests/bgp_bfd_down_cease_notification/test_bgp_bfd_down_cease_notification.py
+++ b/tests/topotests/bgp_bfd_down_cease_notification/test_bgp_bfd_down_cease_notification.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_bfd_down_cease_notification.py
@@ -6,20 +7,6 @@
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Check if Cease/BFD Down notification message is sent/received
diff --git a/tests/topotests/bgp_blackhole_community/test_bgp_blackhole_community.py b/tests/topotests/bgp_blackhole_community/test_bgp_blackhole_community.py
index 4f8fc0d67..16191911a 100644
--- a/tests/topotests/bgp_blackhole_community/test_bgp_blackhole_community.py
+++ b/tests/topotests/bgp_blackhole_community/test_bgp_blackhole_community.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if 172.16.255.254/32 tagged with BLACKHOLE community is not
diff --git a/tests/topotests/bgp_comm_list_delete/test_bgp_comm-list_delete.py b/tests/topotests/bgp_comm_list_delete/test_bgp_comm-list_delete.py
index a2904e6e1..efc8f200a 100644
--- a/tests/topotests/bgp_comm_list_delete/test_bgp_comm-list_delete.py
+++ b/tests/topotests/bgp_comm_list_delete/test_bgp_comm-list_delete.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_comm-list_delete.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 bgp_comm-list_delete.py:
diff --git a/tests/topotests/bgp_comm_list_match/test_bgp_comm_list_match.py b/tests/topotests/bgp_comm_list_match/test_bgp_comm_list_match.py
index 1b8f73d23..03fa8da9d 100644
--- a/tests/topotests/bgp_comm_list_match/test_bgp_comm_list_match.py
+++ b/tests/topotests/bgp_comm_list_match/test_bgp_comm_list_match.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Check if BGP community-list works as OR if multiple community entries specified,
diff --git a/tests/topotests/bgp_communities_topo1/test_bgp_communities.py b/tests/topotests/bgp_communities_topo1/test_bgp_communities.py
index 1c1a5cdfe..f3e03a06a 100644
--- a/tests/topotests/bgp_communities_topo1/test_bgp_communities.py
+++ b/tests/topotests/bgp_communities_topo1/test_bgp_communities.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test bgp community functionality:
diff --git a/tests/topotests/bgp_communities_topo1/test_bgp_communities_topo2.py b/tests/topotests/bgp_communities_topo1/test_bgp_communities_topo2.py
index a93061740..7db6a51c9 100644
--- a/tests/topotests/bgp_communities_topo1/test_bgp_communities_topo2.py
+++ b/tests/topotests/bgp_communities_topo1/test_bgp_communities_topo2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test bgp community functionality:
diff --git a/tests/topotests/bgp_community_alias/test_bgp-community-alias.py b/tests/topotests/bgp_community_alias/test_bgp-community-alias.py
index 0b41dc7c6..5b7974c11 100644
--- a/tests/topotests/bgp_community_alias/test_bgp-community-alias.py
+++ b/tests/topotests/bgp_community_alias/test_bgp-community-alias.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if BGP community alias is visible in CLI outputs
diff --git a/tests/topotests/bgp_community_change_update/test_bgp_community_change_update.py b/tests/topotests/bgp_community_change_update/test_bgp_community_change_update.py
index 31f033ae1..5ad15e064 100644
--- a/tests/topotests/bgp_community_change_update/test_bgp_community_change_update.py
+++ b/tests/topotests/bgp_community_change_update/test_bgp_community_change_update.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2020 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 Reference: https://www.cmand.org/communityexploration
diff --git a/tests/topotests/bgp_conditional_advertisement/test_bgp_conditional_advertisement.py b/tests/topotests/bgp_conditional_advertisement/test_bgp_conditional_advertisement.py
index 0e16b97e4..0128c8834 100644
--- a/tests/topotests/bgp_conditional_advertisement/test_bgp_conditional_advertisement.py
+++ b/tests/topotests/bgp_conditional_advertisement/test_bgp_conditional_advertisement.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_conditional_advertisement.py
@@ -7,20 +8,6 @@
 # Samsung R&D Institute India - Bangalore.
 # Madhurilatha Kuruganti
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test BGP conditional advertisement functionality.
diff --git a/tests/topotests/bgp_conditional_advertisement_track_peer/test_bgp_conditional_advertisement_track_peer.py b/tests/topotests/bgp_conditional_advertisement_track_peer/test_bgp_conditional_advertisement_track_peer.py
index 591bac168..e76307291 100644
--- a/tests/topotests/bgp_conditional_advertisement_track_peer/test_bgp_conditional_advertisement_track_peer.py
+++ b/tests/topotests/bgp_conditional_advertisement_track_peer/test_bgp_conditional_advertisement_track_peer.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Conditionally advertise 172.16.255.2/32 to r1, only if 172.16.255.3/32
diff --git a/tests/topotests/bgp_confed1/test_bgp_confed1.py b/tests/topotests/bgp_confed1/test_bgp_confed1.py
index 7a35a1085..57a852202 100644
--- a/tests/topotests/bgp_confed1/test_bgp_confed1.py
+++ b/tests/topotests/bgp_confed1/test_bgp_confed1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_confed1.py
 #
 # Copyright 2022 6WIND S.A.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND 6WIND DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL 6WIND BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_confed1.py: Test the FRR BGP confederations with AS member
diff --git a/tests/topotests/bgp_default_afi_safi/test_bgp-default-afi-safi.py b/tests/topotests/bgp_default_afi_safi/test_bgp-default-afi-safi.py
index eae2a7d59..a0014c72e 100644
--- a/tests/topotests/bgp_default_afi_safi/test_bgp-default-afi-safi.py
+++ b/tests/topotests/bgp_default_afi_safi/test_bgp-default-afi-safi.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if `bgp default ipv4-unicast`, `bgp default ipv6-unicast`
diff --git a/tests/topotests/bgp_default_originate/test_bgp_default_originate_2links.py b/tests/topotests/bgp_default_originate/test_bgp_default_originate_2links.py
index 4d7f436ea..50c34d45f 100644
--- a/tests/topotests/bgp_default_originate/test_bgp_default_originate_2links.py
+++ b/tests/topotests/bgp_default_originate/test_bgp_default_originate_2links.py
@@ -1,23 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
+#                       Shreenidhi A R <rshreenidhi@vmware.com>
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-# Shreenidhi A R <rshreenidhi@vmware.com>
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
 Following tests are covered.
 1. Verify default-originate route with default static and network command
diff --git a/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_1.py b/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_1.py
index 814272374..6156968de 100644
--- a/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_1.py
+++ b/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_1.py
@@ -1,23 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
+#                       Shreenidhi A R <rshreenidhi@vmware.com>
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-# Shreenidhi A R <rshreenidhi@vmware.com>
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
 Following tests are covered.
 1. Verify BGP default-originate route with IBGP peer
diff --git a/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_2.py b/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_2.py
index 8e6f93063..59f833b93 100644
--- a/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_2.py
+++ b/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_2.py
@@ -1,23 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
+#                       Shreenidhi A R <rshreenidhi@vmware.com>
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-# Shreenidhi A R <rshreenidhi@vmware.com>
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
 Following tests are covered.
 5. Verify BGP  default originate route-map with OUT route-map
diff --git a/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_3.py b/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_3.py
index 9e5250406..eca41e3b9 100644
--- a/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_3.py
+++ b/tests/topotests/bgp_default_originate/test_bgp_default_originate_topo1_3.py
@@ -1,23 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
+#                       Shreenidhi A R <rshreenidhi@vmware.com>
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-# Shreenidhi A R <rshreenidhi@vmware.com>
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
 Following tests are covered.
 10. Verify default-originate route after BGP and FRR process restart
diff --git a/tests/topotests/bgp_default_originate/test_default_orginate_vrf.py b/tests/topotests/bgp_default_originate/test_default_orginate_vrf.py
index fa5164fb7..4dedac553 100644
--- a/tests/topotests/bgp_default_originate/test_default_orginate_vrf.py
+++ b/tests/topotests/bgp_default_originate/test_default_orginate_vrf.py
@@ -1,23 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
+#                       Shreenidhi A R <rshreenidhi@vmware.com>
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-# Shreenidhi A R <rshreenidhi@vmware.com>
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 import os
 import sys
 import time
diff --git a/tests/topotests/bgp_default_originate/test_default_originate_conditional_routemap.py b/tests/topotests/bgp_default_originate/test_default_originate_conditional_routemap.py
index 9e3a3b566..82c4e7e0a 100644
--- a/tests/topotests/bgp_default_originate/test_default_originate_conditional_routemap.py
+++ b/tests/topotests/bgp_default_originate/test_default_originate_conditional_routemap.py
@@ -1,23 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
+#                       Shreenidhi A R <rshreenidhi@vmware.com>
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-# Shreenidhi A R <rshreenidhi@vmware.com>
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
 Following scenerios are covered.
 1. When there is change in route-map policy associated with default-originate, changes does not reflect.
diff --git a/tests/topotests/bgp_default_route/test_bgp_default-originate.py b/tests/topotests/bgp_default_route/test_bgp_default-originate.py
index b2d530b42..2463b0546 100644
--- a/tests/topotests/bgp_default_route/test_bgp_default-originate.py
+++ b/tests/topotests/bgp_default_route/test_bgp_default-originate.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2019-2020 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if default-originate works without route-map.
diff --git a/tests/topotests/bgp_default_route_route_map_match/test_bgp_default-originate_route-map_match.py b/tests/topotests/bgp_default_route_route_map_match/test_bgp_default-originate_route-map_match.py
index 11eaa7b37..9dcb5a1ee 100644
--- a/tests/topotests/bgp_default_route_route_map_match/test_bgp_default-originate_route-map_match.py
+++ b/tests/topotests/bgp_default_route_route_map_match/test_bgp_default-originate_route-map_match.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2019-2020 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if default-originate works with ONLY match operations.
diff --git a/tests/topotests/bgp_default_route_route_map_match2/test_bgp_default-originate_route-map_match2.py b/tests/topotests/bgp_default_route_route_map_match2/test_bgp_default-originate_route-map_match2.py
index 99528f675..965d348bd 100644
--- a/tests/topotests/bgp_default_route_route_map_match2/test_bgp_default-originate_route-map_match2.py
+++ b/tests/topotests/bgp_default_route_route_map_match2/test_bgp_default-originate_route-map_match2.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if default-originate works with conditional match.
diff --git a/tests/topotests/bgp_default_route_route_map_match_set/test_bgp_default-originate_route-map_match_set.py b/tests/topotests/bgp_default_route_route_map_match_set/test_bgp_default-originate_route-map_match_set.py
index c890b0d7d..f94620b2c 100644
--- a/tests/topotests/bgp_default_route_route_map_match_set/test_bgp_default-originate_route-map_match_set.py
+++ b/tests/topotests/bgp_default_route_route_map_match_set/test_bgp_default-originate_route-map_match_set.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2020 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if default-originate works with match operations.
diff --git a/tests/topotests/bgp_default_route_route_map_set/test_bgp_default-originate_route-map_set.py b/tests/topotests/bgp_default_route_route_map_set/test_bgp_default-originate_route-map_set.py
index cc2243a1c..3bd900bda 100644
--- a/tests/topotests/bgp_default_route_route_map_set/test_bgp_default-originate_route-map_set.py
+++ b/tests/topotests/bgp_default_route_route_map_set/test_bgp_default-originate_route-map_set.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2019-2020 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if default-originate works with ONLY set operations.
diff --git a/tests/topotests/bgp_disable_addpath_rx/test_disable_addpath_rx.py b/tests/topotests/bgp_disable_addpath_rx/test_disable_addpath_rx.py
index ed88d5df2..70562ce31 100644
--- a/tests/topotests/bgp_disable_addpath_rx/test_disable_addpath_rx.py
+++ b/tests/topotests/bgp_disable_addpath_rx/test_disable_addpath_rx.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if AddPath RX direction is not negotiated via AddPath capability.
diff --git a/tests/topotests/bgp_distance_change/test_bgp_admin_dist.py b/tests/topotests/bgp_distance_change/test_bgp_admin_dist.py
index 90c3d2224..0bd3d2814 100755
--- a/tests/topotests/bgp_distance_change/test_bgp_admin_dist.py
+++ b/tests/topotests/bgp_distance_change/test_bgp_admin_dist.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import sys
 import time
diff --git a/tests/topotests/bgp_distance_change/test_bgp_admin_dist_vrf.py b/tests/topotests/bgp_distance_change/test_bgp_admin_dist_vrf.py
index 559dc93aa..bf30f2e56 100755
--- a/tests/topotests/bgp_distance_change/test_bgp_admin_dist_vrf.py
+++ b/tests/topotests/bgp_distance_change/test_bgp_admin_dist_vrf.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import sys
 import time
diff --git a/tests/topotests/bgp_distance_change/test_bgp_distance_change.py b/tests/topotests/bgp_distance_change/test_bgp_distance_change.py
index a7040dbe8..2ca50aa56 100644
--- a/tests/topotests/bgp_distance_change/test_bgp_distance_change.py
+++ b/tests/topotests/bgp_distance_change/test_bgp_distance_change.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_distance_change.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 bgp_distance_change.py:
diff --git a/tests/topotests/bgp_dont_capability_negotiate/test_bgp_dont_capability_negotiate.py b/tests/topotests/bgp_dont_capability_negotiate/test_bgp_dont_capability_negotiate.py
index 211472e57..ab71f87a0 100644
--- a/tests/topotests/bgp_dont_capability_negotiate/test_bgp_dont_capability_negotiate.py
+++ b/tests/topotests/bgp_dont_capability_negotiate/test_bgp_dont_capability_negotiate.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if BGP connection is established if at least one peer
diff --git a/tests/topotests/bgp_ebgp_common_subnet_nexthop_unchanged/test_bgp-ebgp-common-subnet-nexthop-unchanged.py b/tests/topotests/bgp_ebgp_common_subnet_nexthop_unchanged/test_bgp-ebgp-common-subnet-nexthop-unchanged.py
index 0fc9d9ddc..34f7dc8cd 100644
--- a/tests/topotests/bgp_ebgp_common_subnet_nexthop_unchanged/test_bgp-ebgp-common-subnet-nexthop-unchanged.py
+++ b/tests/topotests/bgp_ebgp_common_subnet_nexthop_unchanged/test_bgp-ebgp-common-subnet-nexthop-unchanged.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 https://tools.ietf.org/html/rfc4271
diff --git a/tests/topotests/bgp_ebgp_requires_policy/test_bgp_ebgp_requires_policy.py b/tests/topotests/bgp_ebgp_requires_policy/test_bgp_ebgp_requires_policy.py
index e6fe22bf0..6e3b2859c 100644
--- a/tests/topotests/bgp_ebgp_requires_policy/test_bgp_ebgp_requires_policy.py
+++ b/tests/topotests/bgp_ebgp_requires_policy/test_bgp_ebgp_requires_policy.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_ebgp_requires_policy.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 bgp_ebgp_requires_policy.py:
diff --git a/tests/topotests/bgp_ecmp_topo1/test_bgp_ecmp_topo1.py b/tests/topotests/bgp_ecmp_topo1/test_bgp_ecmp_topo1.py
index 96e4bf6ed..97751ec8c 100644
--- a/tests/topotests/bgp_ecmp_topo1/test_bgp_ecmp_topo1.py
+++ b/tests/topotests/bgp_ecmp_topo1/test_bgp_ecmp_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python2
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_ecmp_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_ecmp_topo1.py: Test BGP topology with ECMP (Equal Cost MultiPath).
diff --git a/tests/topotests/bgp_ecmp_topo2/test_ebgp_ecmp_topo2.py b/tests/topotests/bgp_ecmp_topo2/test_ebgp_ecmp_topo2.py
index 8fd0120dd..8362776b7 100644
--- a/tests/topotests/bgp_ecmp_topo2/test_ebgp_ecmp_topo2.py
+++ b/tests/topotests/bgp_ecmp_topo2/test_ebgp_ecmp_topo2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """
diff --git a/tests/topotests/bgp_ecmp_topo2/test_ibgp_ecmp_topo2.py b/tests/topotests/bgp_ecmp_topo2/test_ibgp_ecmp_topo2.py
index 185a08683..b347042dc 100644
--- a/tests/topotests/bgp_ecmp_topo2/test_ibgp_ecmp_topo2.py
+++ b/tests/topotests/bgp_ecmp_topo2/test_ibgp_ecmp_topo2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """
diff --git a/tests/topotests/bgp_ecmp_topo3/test_ibgp_ecmp_topo3.py b/tests/topotests/bgp_ecmp_topo3/test_ibgp_ecmp_topo3.py
index b7f6b7aca..366cf3d4a 100644
--- a/tests/topotests/bgp_ecmp_topo3/test_ibgp_ecmp_topo3.py
+++ b/tests/topotests/bgp_ecmp_topo3/test_ibgp_ecmp_topo3.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """
diff --git a/tests/topotests/bgp_evpn_mh/test_evpn_mh.py b/tests/topotests/bgp_evpn_mh/test_evpn_mh.py
index b0e438106..0bde5d5a9 100644
--- a/tests/topotests/bgp_evpn_mh/test_evpn_mh.py
+++ b/tests/topotests/bgp_evpn_mh/test_evpn_mh.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_evpn_mh.py
@@ -7,20 +8,6 @@
 # Cumulus Networks, Inc.
 # Anuradha Karuppiah
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_evpn_mh.py: Testing EVPN multihoming
diff --git a/tests/topotests/bgp_evpn_overlay_index_gateway/test_bgp_evpn_overlay_index_gateway.py b/tests/topotests/bgp_evpn_overlay_index_gateway/test_bgp_evpn_overlay_index_gateway.py
index 86a875162..106626929 100755
--- a/tests/topotests/bgp_evpn_overlay_index_gateway/test_bgp_evpn_overlay_index_gateway.py
+++ b/tests/topotests/bgp_evpn_overlay_index_gateway/test_bgp_evpn_overlay_index_gateway.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_evpn_overlay_index_gateway.py: Test EVPN gateway IP overlay index functionality
diff --git a/tests/topotests/bgp_evpn_rt5/test_bgp_evpn.py b/tests/topotests/bgp_evpn_rt5/test_bgp_evpn.py
index 3e2fb2b6e..7e4bcc8ad 100644
--- a/tests/topotests/bgp_evpn_rt5/test_bgp_evpn.py
+++ b/tests/topotests/bgp_evpn_rt5/test_bgp_evpn.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_evpn.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2019 by 6WIND
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
  test_bgp_evpn.py: Test the FRR BGP daemon with BGP IPv6 interface
diff --git a/tests/topotests/bgp_evpn_vxlan_topo1/test_bgp_evpn_vxlan.py b/tests/topotests/bgp_evpn_vxlan_topo1/test_bgp_evpn_vxlan.py
index 83ee53c4c..48b79ab5e 100755
--- a/tests/topotests/bgp_evpn_vxlan_topo1/test_bgp_evpn_vxlan.py
+++ b/tests/topotests/bgp_evpn_vxlan_topo1/test_bgp_evpn_vxlan.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_evpn_vxlan.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_evpn_vxlan.py: Test VXLAN EVPN MAC a route signalling over BGP.
diff --git a/tests/topotests/bgp_extended_optional_parameters_length/test_bgp_extended_optional_parameters_length.py b/tests/topotests/bgp_extended_optional_parameters_length/test_bgp_extended_optional_parameters_length.py
index e677dc6ff..eef122b36 100644
--- a/tests/topotests/bgp_extended_optional_parameters_length/test_bgp_extended_optional_parameters_length.py
+++ b/tests/topotests/bgp_extended_optional_parameters_length/test_bgp_extended_optional_parameters_length.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if Extended Optional Parameters Length encoding format works
diff --git a/tests/topotests/bgp_features/test_bgp_features.py b/tests/topotests/bgp_features/test_bgp_features.py
index 0f501f708..c0a5a1905 100644
--- a/tests/topotests/bgp_features/test_bgp_features.py
+++ b/tests/topotests/bgp_features/test_bgp_features.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_features.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_features.py: Test various BGP features.
diff --git a/tests/topotests/bgp_flowspec/test_bgp_flowspec_topo.py b/tests/topotests/bgp_flowspec/test_bgp_flowspec_topo.py
index 682ff4cee..fd675dc8a 100644
--- a/tests/topotests/bgp_flowspec/test_bgp_flowspec_topo.py
+++ b/tests/topotests/bgp_flowspec/test_bgp_flowspec_topo.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_flowspec_topo.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2019 by 6WIND
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_flowspec_topo.py: Test BGP topology with Flowspec EBGP peering
diff --git a/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-1.py b/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-1.py
index deca4bcfd..5e2b2f37b 100644
--- a/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-1.py
+++ b/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-1.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Graceful Restart functionality.
diff --git a/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-2.py b/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-2.py
index a92fde2d0..13c5ba538 100644
--- a/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-2.py
+++ b/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-2.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Graceful Restart functionality.
diff --git a/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-3.py b/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-3.py
index b0166033d..6388295c9 100644
--- a/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-3.py
+++ b/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-3.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Graceful Restart functionality.
diff --git a/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-4.py b/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-4.py
index f408ff485..1166cdc0e 100644
--- a/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-4.py
+++ b/tests/topotests/bgp_gr_functionality_topo1/test_bgp_gr_functionality_topo1-4.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Graceful Restart functionality.
diff --git a/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-1.py b/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-1.py
index 293f3042e..cb6bf5696 100644
--- a/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-1.py
+++ b/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-1.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Graceful Restart functionality.
diff --git a/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-2.py b/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-2.py
index fe885372d..cf9a474a8 100644
--- a/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-2.py
+++ b/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-2.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Graceful Restart functionality.
diff --git a/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-3.py b/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-3.py
index 4ff62a978..4746d71a3 100644
--- a/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-3.py
+++ b/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-3.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Graceful Restart functionality.
diff --git a/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-4.py b/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-4.py
index fd1ef097c..1c41df98e 100644
--- a/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-4.py
+++ b/tests/topotests/bgp_gr_functionality_topo2/test_bgp_gr_functionality_topo2-4.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Graceful Restart functionality.
diff --git a/tests/topotests/bgp_gr_functionality_topo3/bgp_gr_functionality_topo3.py b/tests/topotests/bgp_gr_functionality_topo3/bgp_gr_functionality_topo3.py
index 76522206a..593a8d641 100644
--- a/tests/topotests/bgp_gr_functionality_topo3/bgp_gr_functionality_topo3.py
+++ b/tests/topotests/bgp_gr_functionality_topo3/bgp_gr_functionality_topo3.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import sys
diff --git a/tests/topotests/bgp_gr_notification/test_bgp_gr_notification.py b/tests/topotests/bgp_gr_notification/test_bgp_gr_notification.py
index 3519e5cc7..2ffcb723e 100644
--- a/tests/topotests/bgp_gr_notification/test_bgp_gr_notification.py
+++ b/tests/topotests/bgp_gr_notification/test_bgp_gr_notification.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_gr_notification.py
@@ -6,20 +7,6 @@
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 TC1: Disable the link between R1-R2 and wait for HoldTimerExpire notification:
diff --git a/tests/topotests/bgp_gr_restart_retain_routes/test_bgp_gr_restart_retain_routes.py b/tests/topotests/bgp_gr_restart_retain_routes/test_bgp_gr_restart_retain_routes.py
index 52ce0d5b5..0b6152568 100644
--- a/tests/topotests/bgp_gr_restart_retain_routes/test_bgp_gr_restart_retain_routes.py
+++ b/tests/topotests/bgp_gr_restart_retain_routes/test_bgp_gr_restart_retain_routes.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if routes are retained during BGP restarts.
diff --git a/tests/topotests/bgp_gshut/test_bgp_gshut.py b/tests/topotests/bgp_gshut/test_bgp_gshut.py
index 764252d96..61a0fe63c 100644
--- a/tests/topotests/bgp_gshut/test_bgp_gshut.py
+++ b/tests/topotests/bgp_gshut/test_bgp_gshut.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_gshut.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Vivek Venkatraman <vivek@nvidia.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test the ability to initiate and stop BGP graceful shutdown.
diff --git a/tests/topotests/bgp_gshut_topo1/test_ebgp_gshut_topo1.py b/tests/topotests/bgp_gshut_topo1/test_ebgp_gshut_topo1.py
index 684d2fcb5..5ec9db0db 100644
--- a/tests/topotests/bgp_gshut_topo1/test_ebgp_gshut_topo1.py
+++ b/tests/topotests/bgp_gshut_topo1/test_ebgp_gshut_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """
diff --git a/tests/topotests/bgp_gshut_topo1/test_ibgp_gshut_topo1.py b/tests/topotests/bgp_gshut_topo1/test_ibgp_gshut_topo1.py
index 16572a796..1e0f7266a 100644
--- a/tests/topotests/bgp_gshut_topo1/test_ibgp_gshut_topo1.py
+++ b/tests/topotests/bgp_gshut_topo1/test_ibgp_gshut_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """
diff --git a/tests/topotests/bgp_instance_del_test/test_bgp_instance_del_test.py b/tests/topotests/bgp_instance_del_test/test_bgp_instance_del_test.py
index 0c7e84a5a..ddb5fe5d8 100755
--- a/tests/topotests/bgp_instance_del_test/test_bgp_instance_del_test.py
+++ b/tests/topotests/bgp_instance_del_test/test_bgp_instance_del_test.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -6,20 +7,6 @@
 # Copyright (c) 2018, LabN Consulting, L.L.C.
 # Authored by Lou Berger <lberger@labn.net>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import sys
diff --git a/tests/topotests/bgp_ipv4_class_e_peer/test_bgp_ipv4_class_e_peer.py b/tests/topotests/bgp_ipv4_class_e_peer/test_bgp_ipv4_class_e_peer.py
index c2f0d2e0d..c7cb213de 100644
--- a/tests/topotests/bgp_ipv4_class_e_peer/test_bgp_ipv4_class_e_peer.py
+++ b/tests/topotests/bgp_ipv4_class_e_peer/test_bgp_ipv4_class_e_peer.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_ipv4_class_e_peer.py
@@ -6,20 +7,6 @@
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Check if the peering works by using IPv4 Class E IP ranges, and if
diff --git a/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_ibgp_nbr.py b/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_ibgp_nbr.py
index 9f01287c9..1873fb0ea 100644
--- a/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_ibgp_nbr.py
+++ b/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_ibgp_nbr.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """RFC5549 Automation."""
diff --git a/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_nbr.py b/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_nbr.py
index 48f308e31..47cc378ee 100644
--- a/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_nbr.py
+++ b/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_nbr.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """RFC5549 Automation."""
diff --git a/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_unnumbered_nbr.py b/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_unnumbered_nbr.py
index c07090435..395ef2d91 100644
--- a/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_unnumbered_nbr.py
+++ b/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ebgp_unnumbered_nbr.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """RFC5549 Automation."""
diff --git a/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ibgp_nbr.py b/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ibgp_nbr.py
index a9e6d21b8..56152b916 100644
--- a/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ibgp_nbr.py
+++ b/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ibgp_nbr.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """RFC5549 Automation."""
diff --git a/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ibgp_unnumbered_nbr.py b/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ibgp_unnumbered_nbr.py
index 9a0fc4417..526b267ea 100644
--- a/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ibgp_unnumbered_nbr.py
+++ b/tests/topotests/bgp_ipv4_over_ipv6/test_rfc5549_ibgp_unnumbered_nbr.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """RFC5549 Automation."""
diff --git a/tests/topotests/bgp_ipv6_rtadv/test_bgp_ipv6_rtadv.py b/tests/topotests/bgp_ipv6_rtadv/test_bgp_ipv6_rtadv.py
index 981028ff7..045ac91fc 100644
--- a/tests/topotests/bgp_ipv6_rtadv/test_bgp_ipv6_rtadv.py
+++ b/tests/topotests/bgp_ipv6_rtadv/test_bgp_ipv6_rtadv.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_ipv6_rtadv.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2019 by 6WIND
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
  test_bgp_ipv6_rtadv.py: Test the FRR BGP daemon with BGP IPv6 interface
diff --git a/tests/topotests/bgp_l3vpn_to_bgp_direct/customize.py b/tests/topotests/bgp_l3vpn_to_bgp_direct/customize.py
index c0a5c7ad9..41114b69c 100644
--- a/tests/topotests/bgp_l3vpn_to_bgp_direct/customize.py
+++ b/tests/topotests/bgp_l3vpn_to_bgp_direct/customize.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -6,20 +7,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 customize.py: Simple FRR MPLS L3VPN test topology
diff --git a/tests/topotests/bgp_l3vpn_to_bgp_direct/test_bgp_l3vpn_to_bgp_direct.py b/tests/topotests/bgp_l3vpn_to_bgp_direct/test_bgp_l3vpn_to_bgp_direct.py
index be12cfde3..7930f0933 100755
--- a/tests/topotests/bgp_l3vpn_to_bgp_direct/test_bgp_l3vpn_to_bgp_direct.py
+++ b/tests/topotests/bgp_l3vpn_to_bgp_direct/test_bgp_l3vpn_to_bgp_direct.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -6,20 +7,6 @@
 # Copyright (c) 2018, LabN Consulting, L.L.C.
 # Authored by Lou Berger <lberger@labn.net>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import sys
diff --git a/tests/topotests/bgp_l3vpn_to_bgp_vrf/customize.py b/tests/topotests/bgp_l3vpn_to_bgp_vrf/customize.py
index 5161d8471..0ac535030 100644
--- a/tests/topotests/bgp_l3vpn_to_bgp_vrf/customize.py
+++ b/tests/topotests/bgp_l3vpn_to_bgp_vrf/customize.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -6,20 +7,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 customize.py: Simple FRR MPLS L3VPN test topology
diff --git a/tests/topotests/bgp_l3vpn_to_bgp_vrf/test_bgp_l3vpn_to_bgp_vrf.py b/tests/topotests/bgp_l3vpn_to_bgp_vrf/test_bgp_l3vpn_to_bgp_vrf.py
index 3844b5ef8..60d959fd1 100755
--- a/tests/topotests/bgp_l3vpn_to_bgp_vrf/test_bgp_l3vpn_to_bgp_vrf.py
+++ b/tests/topotests/bgp_l3vpn_to_bgp_vrf/test_bgp_l3vpn_to_bgp_vrf.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -6,20 +7,6 @@
 # Copyright (c) 2018, LabN Consulting, L.L.C.
 # Authored by Lou Berger <lberger@labn.net>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import sys
diff --git a/tests/topotests/bgp_labeled_unicast_addpath/test_bgp_labeled_unicast_addpath.py b/tests/topotests/bgp_labeled_unicast_addpath/test_bgp_labeled_unicast_addpath.py
index aae901eab..3af779c42 100644
--- a/tests/topotests/bgp_labeled_unicast_addpath/test_bgp_labeled_unicast_addpath.py
+++ b/tests/topotests/bgp_labeled_unicast_addpath/test_bgp_labeled_unicast_addpath.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Check if labeled-unicast works correctly with addpath capability.
diff --git a/tests/topotests/bgp_labeled_unicast_default_originate/test_bgp_labeled_unicast_default_originate.py b/tests/topotests/bgp_labeled_unicast_default_originate/test_bgp_labeled_unicast_default_originate.py
index 91a92d2dd..c3ccefb56 100644
--- a/tests/topotests/bgp_labeled_unicast_default_originate/test_bgp_labeled_unicast_default_originate.py
+++ b/tests/topotests/bgp_labeled_unicast_default_originate/test_bgp_labeled_unicast_default_originate.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Check if labeled-unicast works correctly with default-originate.
diff --git a/tests/topotests/bgp_large_community/test_bgp_large_community_topo_1.py b/tests/topotests/bgp_large_community/test_bgp_large_community_topo_1.py
index 03cfded51..892b15a06 100644
--- a/tests/topotests/bgp_large_community/test_bgp_large_community_topo_1.py
+++ b/tests/topotests/bgp_large_community/test_bgp_large_community_topo_1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """
diff --git a/tests/topotests/bgp_large_community/test_bgp_large_community_topo_2.py b/tests/topotests/bgp_large_community/test_bgp_large_community_topo_2.py
index b11cda3cd..0044dbba5 100644
--- a/tests/topotests/bgp_large_community/test_bgp_large_community_topo_2.py
+++ b/tests/topotests/bgp_large_community/test_bgp_large_community_topo_2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_large_community_topo_1.py: Test BGP large community.
diff --git a/tests/topotests/bgp_link_bw_ip/test_bgp_linkbw_ip.py b/tests/topotests/bgp_link_bw_ip/test_bgp_linkbw_ip.py
index 4214f3a86..af6976b5a 100644
--- a/tests/topotests/bgp_link_bw_ip/test_bgp_linkbw_ip.py
+++ b/tests/topotests/bgp_link_bw_ip/test_bgp_linkbw_ip.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_linkbw_ip.py
@@ -7,20 +8,6 @@
 # Cumulus Networks, Inc
 # Vivek Venkatraman
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_linkbw_ip.py: Test weighted ECMP using BGP link-bandwidth
diff --git a/tests/topotests/bgp_listen_on_multiple_addresses/test_bgp_listen_on_multiple_addresses.py b/tests/topotests/bgp_listen_on_multiple_addresses/test_bgp_listen_on_multiple_addresses.py
index 4b4335a01..988b5790b 100755
--- a/tests/topotests/bgp_listen_on_multiple_addresses/test_bgp_listen_on_multiple_addresses.py
+++ b/tests/topotests/bgp_listen_on_multiple_addresses/test_bgp_listen_on_multiple_addresses.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_listen_on_multiple_addresses.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2021 by Boeing Defence Australia
 # Adriano Marto Reis
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_listen_on_multiple_addresses.py: Test BGP daemon listening for
diff --git a/tests/topotests/bgp_llgr/test_bgp_llgr.py b/tests/topotests/bgp_llgr/test_bgp_llgr.py
index fa57f6640..d60487130 100644
--- a/tests/topotests/bgp_llgr/test_bgp_llgr.py
+++ b/tests/topotests/bgp_llgr/test_bgp_llgr.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if BGP Long-lived Graceful Restart capability works:
diff --git a/tests/topotests/bgp_local_as/test_bgp_local_as.py b/tests/topotests/bgp_local_as/test_bgp_local_as.py
index 525d44220..9e5f146b4 100644
--- a/tests/topotests/bgp_local_as/test_bgp_local_as.py
+++ b/tests/topotests/bgp_local_as/test_bgp_local_as.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 
diff --git a/tests/topotests/bgp_local_as_private_remove/test_bgp_local_as_private_remove.py b/tests/topotests/bgp_local_as_private_remove/test_bgp_local_as_private_remove.py
index 2b4c4e816..9d22a799a 100644
--- a/tests/topotests/bgp_local_as_private_remove/test_bgp_local_as_private_remove.py
+++ b/tests/topotests/bgp_local_as_private_remove/test_bgp_local_as_private_remove.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_local_as_private_remove.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 bgp_local_as_private_remove.py:
diff --git a/tests/topotests/bgp_local_asn/test_bgp_local_asn_agg.py b/tests/topotests/bgp_local_asn/test_bgp_local_asn_agg.py
index 8f7e1285e..26e8fe970 100644
--- a/tests/topotests/bgp_local_asn/test_bgp_local_asn_agg.py
+++ b/tests/topotests/bgp_local_asn/test_bgp_local_asn_agg.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """
diff --git a/tests/topotests/bgp_local_asn/test_bgp_local_asn_ecmp.py b/tests/topotests/bgp_local_asn/test_bgp_local_asn_ecmp.py
index d7c480d0b..8a1157052 100644
--- a/tests/topotests/bgp_local_asn/test_bgp_local_asn_ecmp.py
+++ b/tests/topotests/bgp_local_asn/test_bgp_local_asn_ecmp.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 #
 ##########################################################################################################################################
 #
diff --git a/tests/topotests/bgp_local_asn/test_bgp_local_asn_topo1.py b/tests/topotests/bgp_local_asn/test_bgp_local_asn_topo1.py
index 925980a43..25c9bee93 100644
--- a/tests/topotests/bgp_local_asn/test_bgp_local_asn_topo1.py
+++ b/tests/topotests/bgp_local_asn/test_bgp_local_asn_topo1.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 ##########################################################################################################
 #
diff --git a/tests/topotests/bgp_local_asn/test_bgp_local_asn_topo2.py b/tests/topotests/bgp_local_asn/test_bgp_local_asn_topo2.py
index 6f4dc1bef..0c10c6409 100644
--- a/tests/topotests/bgp_local_asn/test_bgp_local_asn_topo2.py
+++ b/tests/topotests/bgp_local_asn/test_bgp_local_asn_topo2.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 ##########################################################################################################
 #
 #   Testcases
diff --git a/tests/topotests/bgp_local_asn/test_bgp_local_asn_vrf_topo1.py b/tests/topotests/bgp_local_asn/test_bgp_local_asn_vrf_topo1.py
index 5e2503f81..ea6ab59b3 100644
--- a/tests/topotests/bgp_local_asn/test_bgp_local_asn_vrf_topo1.py
+++ b/tests/topotests/bgp_local_asn/test_bgp_local_asn_vrf_topo1.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 1. Verify the BGP Local AS functionality by adding new AS when dynamically import routes
diff --git a/tests/topotests/bgp_local_asn/test_bgp_local_asn_vrf_topo2.py b/tests/topotests/bgp_local_asn/test_bgp_local_asn_vrf_topo2.py
index 5992e0655..b1204bf58 100644
--- a/tests/topotests/bgp_local_asn/test_bgp_local_asn_vrf_topo2.py
+++ b/tests/topotests/bgp_local_asn/test_bgp_local_asn_vrf_topo2.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 1. Verify the BGP Local AS functionality by adding new AS when leaking routes
diff --git a/tests/topotests/bgp_lu_topo1/test_bgp_lu.py b/tests/topotests/bgp_lu_topo1/test_bgp_lu.py
index 8955f2794..7d5976241 100644
--- a/tests/topotests/bgp_lu_topo1/test_bgp_lu.py
+++ b/tests/topotests/bgp_lu_topo1/test_bgp_lu.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_lu.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_lu.py: Test BGP LU label allocation
diff --git a/tests/topotests/bgp_lu_topo2/test_bgp_lu2.py b/tests/topotests/bgp_lu_topo2/test_bgp_lu2.py
index fc9d2c433..13e658260 100644
--- a/tests/topotests/bgp_lu_topo2/test_bgp_lu2.py
+++ b/tests/topotests/bgp_lu_topo2/test_bgp_lu2.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # test_bgp_lu2.py
 #
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by Volta Networks
 # Copyright (c) 2021 by Nvidia, Inc.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_lu2.py: Test BGP LU label allocation
diff --git a/tests/topotests/bgp_max_med_on_startup/test_bgp_max_med_on_startup.py b/tests/topotests/bgp_max_med_on_startup/test_bgp_max_med_on_startup.py
index a83d43310..a9810ba26 100644
--- a/tests/topotests/bgp_max_med_on_startup/test_bgp_max_med_on_startup.py
+++ b/tests/topotests/bgp_max_med_on_startup/test_bgp_max_med_on_startup.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_max_med_on_startup.py
 #
 # Copyright (c) 2022 Rubicon Communications, LLC.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test whether `bgp max-med on-startup (5-86400) [(0-4294967295)]` is working
diff --git a/tests/topotests/bgp_maximum_prefix_invalid_update/test_bgp_maximum_prefix_invalid_update.py b/tests/topotests/bgp_maximum_prefix_invalid_update/test_bgp_maximum_prefix_invalid_update.py
index ee68ecd7b..c6bdbc3c1 100644
--- a/tests/topotests/bgp_maximum_prefix_invalid_update/test_bgp_maximum_prefix_invalid_update.py
+++ b/tests/topotests/bgp_maximum_prefix_invalid_update/test_bgp_maximum_prefix_invalid_update.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_local_as_private_remove.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 bgp_maximum_prefix_invalid_update.py:
diff --git a/tests/topotests/bgp_maximum_prefix_out/test_bgp_maximum_prefix_out.py b/tests/topotests/bgp_maximum_prefix_out/test_bgp_maximum_prefix_out.py
index 696d6d94c..0b346f63d 100644
--- a/tests/topotests/bgp_maximum_prefix_out/test_bgp_maximum_prefix_out.py
+++ b/tests/topotests/bgp_maximum_prefix_out/test_bgp_maximum_prefix_out.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_maximum_prefix_out.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if `neighbor <X.X.X.X> maximum-prefix-out <Y>` is working
diff --git a/tests/topotests/bgp_minimum_holdtime/test_bgp_minimum_holdtime.py b/tests/topotests/bgp_minimum_holdtime/test_bgp_minimum_holdtime.py
index b1641b3c1..9f4d96827 100755
--- a/tests/topotests/bgp_minimum_holdtime/test_bgp_minimum_holdtime.py
+++ b/tests/topotests/bgp_minimum_holdtime/test_bgp_minimum_holdtime.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Takemasa Imada <takemasa.imada@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if minimum-holdtime works.
diff --git a/tests/topotests/bgp_multi_vrf_topo1/test_bgp_multi_vrf_topo1.py b/tests/topotests/bgp_multi_vrf_topo1/test_bgp_multi_vrf_topo1.py
index 7eb5bda2d..0d92a3c9f 100644
--- a/tests/topotests/bgp_multi_vrf_topo1/test_bgp_multi_vrf_topo1.py
+++ b/tests/topotests/bgp_multi_vrf_topo1/test_bgp_multi_vrf_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Multi-VRF:
diff --git a/tests/topotests/bgp_multi_vrf_topo2/test_bgp_multi_vrf_topo2.py b/tests/topotests/bgp_multi_vrf_topo2/test_bgp_multi_vrf_topo2.py
index 04ebe61a0..40a28fbcf 100644
--- a/tests/topotests/bgp_multi_vrf_topo2/test_bgp_multi_vrf_topo2.py
+++ b/tests/topotests/bgp_multi_vrf_topo2/test_bgp_multi_vrf_topo2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Multi-VRF:
diff --git a/tests/topotests/bgp_multiview_topo1/test_bgp_multiview_topo1.py b/tests/topotests/bgp_multiview_topo1/test_bgp_multiview_topo1.py
index 77619e59b..2f3421d18 100644
--- a/tests/topotests/bgp_multiview_topo1/test_bgp_multiview_topo1.py
+++ b/tests/topotests/bgp_multiview_topo1/test_bgp_multiview_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_multiview_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2016 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 test_bgp_multiview_topo1.py: Simple FRR Route-Server Test
diff --git a/tests/topotests/bgp_orf/test_bgp_orf.py b/tests/topotests/bgp_orf/test_bgp_orf.py
index cb74b85b7..7f45a242c 100644
--- a/tests/topotests/bgp_orf/test_bgp_orf.py
+++ b/tests/topotests/bgp_orf/test_bgp_orf.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if BGP ORF filtering is working correctly when modifying
diff --git a/tests/topotests/bgp_path_attribute_discard/test_bgp_path_attribute_discard.py b/tests/topotests/bgp_path_attribute_discard/test_bgp_path_attribute_discard.py
index 4badf64c3..38fb4c25d 100644
--- a/tests/topotests/bgp_path_attribute_discard/test_bgp_path_attribute_discard.py
+++ b/tests/topotests/bgp_path_attribute_discard/test_bgp_path_attribute_discard.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if `neighbor path-attribute discard` command works correctly,
diff --git a/tests/topotests/bgp_path_attributes_topo1/test_bgp_path_attributes.py b/tests/topotests/bgp_path_attributes_topo1/test_bgp_path_attributes.py
index 870c2f7a1..df390327d 100644
--- a/tests/topotests/bgp_path_attributes_topo1/test_bgp_path_attributes.py
+++ b/tests/topotests/bgp_path_attributes_topo1/test_bgp_path_attributes.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Modified work Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Original work Copyright (c) 2018 by Network Device Education
 # Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test AS-Path functionality:
diff --git a/tests/topotests/bgp_path_selection/test_bgp_path_selection.py b/tests/topotests/bgp_path_selection/test_bgp_path_selection.py
index 50b71d862..bf5737b66 100644
--- a/tests/topotests/bgp_path_selection/test_bgp_path_selection.py
+++ b/tests/topotests/bgp_path_selection/test_bgp_path_selection.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Louis Scalbert <louis.scalbert@6wind.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 
diff --git a/tests/topotests/bgp_peer_graceful_shutdown/test_bgp_peer_graceful_shutdown.py b/tests/topotests/bgp_peer_graceful_shutdown/test_bgp_peer_graceful_shutdown.py
index de62889a0..2eb936aaa 100644
--- a/tests/topotests/bgp_peer_graceful_shutdown/test_bgp_peer_graceful_shutdown.py
+++ b/tests/topotests/bgp_peer_graceful_shutdown/test_bgp_peer_graceful_shutdown.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Check if routes from R1 has local-preference set to 0 and graceful-shutdown
diff --git a/tests/topotests/bgp_peer_group/test_bgp_peer-group.py b/tests/topotests/bgp_peer_group/test_bgp_peer-group.py
index 494f6c68b..e8c3feb76 100644
--- a/tests/topotests/bgp_peer_group/test_bgp_peer-group.py
+++ b/tests/topotests/bgp_peer_group/test_bgp_peer-group.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if peer-group works for numbered and unnumbered configurations.
diff --git a/tests/topotests/bgp_peer_type_multipath_relax/test_bgp_peer-type_multipath-relax.py b/tests/topotests/bgp_peer_type_multipath_relax/test_bgp_peer-type_multipath-relax.py
index 8321a5755..ad6674c52 100755
--- a/tests/topotests/bgp_peer_type_multipath_relax/test_bgp_peer-type_multipath-relax.py
+++ b/tests/topotests/bgp_peer_type_multipath_relax/test_bgp_peer-type_multipath-relax.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
 #
 # Copyright (c) 2021 Arista Networks, Inc.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND Arista Networks DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_peer-type_multipath-relax.py:
diff --git a/tests/topotests/bgp_prefix_list_topo1/test_prefix_lists.py b/tests/topotests/bgp_prefix_list_topo1/test_prefix_lists.py
index 5131a89ce..f351dde74 100644
--- a/tests/topotests/bgp_prefix_list_topo1/test_prefix_lists.py
+++ b/tests/topotests/bgp_prefix_list_topo1/test_prefix_lists.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test prefix-list functionality:
diff --git a/tests/topotests/bgp_prefix_sid/test_bgp_prefix_sid.py b/tests/topotests/bgp_prefix_sid/test_bgp_prefix_sid.py
index d51dc5f0c..bfc083b50 100644
--- a/tests/topotests/bgp_prefix_sid/test_bgp_prefix_sid.py
+++ b/tests/topotests/bgp_prefix_sid/test_bgp_prefix_sid.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_prefix_sid.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by LINE Corporation
 # Copyright (c) 2020 by Hiroki Shirokura <slank.dev@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_prefix_sid.py: Test BGP topology with EBGP on prefix-sid
diff --git a/tests/topotests/bgp_prefix_sid2/test_bgp_prefix_sid2.py b/tests/topotests/bgp_prefix_sid2/test_bgp_prefix_sid2.py
index 96c4b664b..d6b94329e 100755
--- a/tests/topotests/bgp_prefix_sid2/test_bgp_prefix_sid2.py
+++ b/tests/topotests/bgp_prefix_sid2/test_bgp_prefix_sid2.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_prefix_sid2.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by LINE Corporation
 # Copyright (c) 2020 by Hiroki Shirokura <slank.dev@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_prefix_sid2.py: Test BGP topology with EBGP on prefix-sid
diff --git a/tests/topotests/bgp_recursive_route_ebgp_multi_hop/test_bgp_recursive_route_ebgp_multi_hop.py b/tests/topotests/bgp_recursive_route_ebgp_multi_hop/test_bgp_recursive_route_ebgp_multi_hop.py
index 04f866f35..35459f6f6 100644
--- a/tests/topotests/bgp_recursive_route_ebgp_multi_hop/test_bgp_recursive_route_ebgp_multi_hop.py
+++ b/tests/topotests/bgp_recursive_route_ebgp_multi_hop/test_bgp_recursive_route_ebgp_multi_hop.py
@@ -1,23 +1,10 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test bgp recursive route and ebgp
diff --git a/tests/topotests/bgp_reject_as_sets/test_bgp_reject_as_sets.py b/tests/topotests/bgp_reject_as_sets/test_bgp_reject_as_sets.py
index 8d1e83498..97366ebd5 100644
--- a/tests/topotests/bgp_reject_as_sets/test_bgp_reject_as_sets.py
+++ b/tests/topotests/bgp_reject_as_sets/test_bgp_reject_as_sets.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_reject_as_sets.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if an aggregated route with AS_SET is not sent to peers.
diff --git a/tests/topotests/bgp_remove_private_as/test_bgp_remove_private_as.py b/tests/topotests/bgp_remove_private_as/test_bgp_remove_private_as.py
index 1108919e1..113423744 100644
--- a/tests/topotests/bgp_remove_private_as/test_bgp_remove_private_as.py
+++ b/tests/topotests/bgp_remove_private_as/test_bgp_remove_private_as.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_remove_private_as.py
@@ -6,20 +7,6 @@
 # Copyright (C) 2022  NVIDIA Corporation
 # Trey Aspelund
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NVIDIA DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NVIDIA BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_remove_private_as.py tests the following conditions:
diff --git a/tests/topotests/bgp_rfapi_basic_sanity/customize.py b/tests/topotests/bgp_rfapi_basic_sanity/customize.py
index c82fe8321..c789fa8c1 100644
--- a/tests/topotests/bgp_rfapi_basic_sanity/customize.py
+++ b/tests/topotests/bgp_rfapi_basic_sanity/customize.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -7,20 +8,6 @@
 # Network Device Education Foundation, Inc. ("NetDEF")
 # Modified by LabN Consulting, L.L.C.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 customize.py: Simple FRR MPLS L3VPN test topology
diff --git a/tests/topotests/bgp_rfapi_basic_sanity/test_bgp_rfapi_basic_sanity.py b/tests/topotests/bgp_rfapi_basic_sanity/test_bgp_rfapi_basic_sanity.py
index fa04aaf36..7534dce1b 100755
--- a/tests/topotests/bgp_rfapi_basic_sanity/test_bgp_rfapi_basic_sanity.py
+++ b/tests/topotests/bgp_rfapi_basic_sanity/test_bgp_rfapi_basic_sanity.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -6,20 +7,6 @@
 # Copyright (c) 2018, LabN Consulting, L.L.C.
 # Authored by Lou Berger <lberger@labn.net>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import sys
diff --git a/tests/topotests/bgp_rmap_extcommunity_none/test_bgp_rmap_extcommunity_none.py b/tests/topotests/bgp_rmap_extcommunity_none/test_bgp_rmap_extcommunity_none.py
index d34ac3cdd..5c7cc8eae 100644
--- a/tests/topotests/bgp_rmap_extcommunity_none/test_bgp_rmap_extcommunity_none.py
+++ b/tests/topotests/bgp_rmap_extcommunity_none/test_bgp_rmap_extcommunity_none.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if route-map extcommunity none works:
diff --git a/tests/topotests/bgp_roles_capability/test_bgp_roles_capability.py b/tests/topotests/bgp_roles_capability/test_bgp_roles_capability.py
index d72fd19b9..52fda695c 100644
--- a/tests/topotests/bgp_roles_capability/test_bgp_roles_capability.py
+++ b/tests/topotests/bgp_roles_capability/test_bgp_roles_capability.py
@@ -1,4 +1,5 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 #
 # test_bgp_roles_capability.py
 # Part of NetDEF Topology Tests
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_roles_capability: test bgp roles negotiation
diff --git a/tests/topotests/bgp_roles_filtering/test_bgp_roles_filtering.py b/tests/topotests/bgp_roles_filtering/test_bgp_roles_filtering.py
index c5827d7a9..b3715863b 100644
--- a/tests/topotests/bgp_roles_filtering/test_bgp_roles_filtering.py
+++ b/tests/topotests/bgp_roles_filtering/test_bgp_roles_filtering.py
@@ -1,4 +1,5 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 #
 # test_bgp_roles_filtering.py
 # Part of NetDEF Topology Tests
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_roles_filtering: test leaks prevention and mitigation with roles
diff --git a/tests/topotests/bgp_route_aggregation/test_bgp_aggregation.py b/tests/topotests/bgp_route_aggregation/test_bgp_aggregation.py
index 8c9d2c9db..412ecc12e 100644
--- a/tests/topotests/bgp_route_aggregation/test_bgp_aggregation.py
+++ b/tests/topotests/bgp_route_aggregation/test_bgp_aggregation.py
@@ -1,23 +1,10 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test bgp aggregation functionality:
diff --git a/tests/topotests/bgp_route_map/test_route_map_topo1.py b/tests/topotests/bgp_route_map/test_route_map_topo1.py
index 77bddbe33..e300e8d8d 100644
--- a/tests/topotests/bgp_route_map/test_route_map_topo1.py
+++ b/tests/topotests/bgp_route_map/test_route_map_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import sys
 import time
diff --git a/tests/topotests/bgp_route_map/test_route_map_topo2.py b/tests/topotests/bgp_route_map/test_route_map_topo2.py
index 589482d6a..95906ecbd 100644
--- a/tests/topotests/bgp_route_map/test_route_map_topo2.py
+++ b/tests/topotests/bgp_route_map/test_route_map_topo2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """Following tests are covered to test route-map functionality.
 TC_57:
diff --git a/tests/topotests/bgp_route_map_match_ipv6_nexthop/test_bgp_route_map_match_ipv6_nexthop.py b/tests/topotests/bgp_route_map_match_ipv6_nexthop/test_bgp_route_map_match_ipv6_nexthop.py
index 8c86526bf..a06e3edc4 100644
--- a/tests/topotests/bgp_route_map_match_ipv6_nexthop/test_bgp_route_map_match_ipv6_nexthop.py
+++ b/tests/topotests/bgp_route_map_match_ipv6_nexthop/test_bgp_route_map_match_ipv6_nexthop.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if we can match BGP prefixes by next-hop which is
diff --git a/tests/topotests/bgp_route_map_vpn_import/test_bgp_route_map_vpn_import.py b/tests/topotests/bgp_route_map_vpn_import/test_bgp_route_map_vpn_import.py
index 9de1b1a0e..37082b484 100644
--- a/tests/topotests/bgp_route_map_vpn_import/test_bgp_route_map_vpn_import.py
+++ b/tests/topotests/bgp_route_map_vpn_import/test_bgp_route_map_vpn_import.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if `route-map vpn import NAME` works by setting/matching via route-maps.
diff --git a/tests/topotests/bgp_route_server_client/test_bgp_route_server_client.py b/tests/topotests/bgp_route_server_client/test_bgp_route_server_client.py
index 21088f700..23cf041b6 100644
--- a/tests/topotests/bgp_route_server_client/test_bgp_route_server_client.py
+++ b/tests/topotests/bgp_route_server_client/test_bgp_route_server_client.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if we send ONLY GUA address for route-server-client peers.
diff --git a/tests/topotests/bgp_rr_ibgp/test_bgp_rr_ibgp_topo1.py b/tests/topotests/bgp_rr_ibgp/test_bgp_rr_ibgp_topo1.py
index cf8315f59..9984abaa8 100644
--- a/tests/topotests/bgp_rr_ibgp/test_bgp_rr_ibgp_topo1.py
+++ b/tests/topotests/bgp_rr_ibgp/test_bgp_rr_ibgp_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_rr_ibgp_topo1.py
@@ -7,20 +8,6 @@
 # Cumulus Networks, Inc.
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_rr_ibgp_topo1.py: Testing IBGP with RR and no IGP
diff --git a/tests/topotests/bgp_sender_as_path_loop_detection/test_bgp_sender-as-path-loop-detection.py b/tests/topotests/bgp_sender_as_path_loop_detection/test_bgp_sender-as-path-loop-detection.py
index ebeab0564..3886bc177 100644
--- a/tests/topotests/bgp_sender_as_path_loop_detection/test_bgp_sender-as-path-loop-detection.py
+++ b/tests/topotests/bgp_sender_as_path_loop_detection/test_bgp_sender-as-path-loop-detection.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_sender-as-path-loop-detection.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if neighbor <neighbor> sender-as-path-loop-detection
diff --git a/tests/topotests/bgp_set_aspath_replace/test_bgp_set_aspath_replace.py b/tests/topotests/bgp_set_aspath_replace/test_bgp_set_aspath_replace.py
index d5549ae89..463df2f2a 100644
--- a/tests/topotests/bgp_set_aspath_replace/test_bgp_set_aspath_replace.py
+++ b/tests/topotests/bgp_set_aspath_replace/test_bgp_set_aspath_replace.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_set_aspath_replace.py
@@ -6,20 +7,6 @@
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if `set as-path replace` is working correctly for route-maps.
diff --git a/tests/topotests/bgp_set_local_preference_add_subtract/test_bgp_set_local-preference_add_subtract.py b/tests/topotests/bgp_set_local_preference_add_subtract/test_bgp_set_local-preference_add_subtract.py
index ec9c8a41c..292cf70d3 100644
--- a/tests/topotests/bgp_set_local_preference_add_subtract/test_bgp_set_local-preference_add_subtract.py
+++ b/tests/topotests/bgp_set_local_preference_add_subtract/test_bgp_set_local-preference_add_subtract.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_set_local-preference_add_subtract.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 bgp_set_local-preference_add_subtract.py:
diff --git a/tests/topotests/bgp_snmp_bgp4v2mib/test_bgp_snmp_bgp4v2mib.py b/tests/topotests/bgp_snmp_bgp4v2mib/test_bgp_snmp_bgp4v2mib.py
index 53ca10930..583d89d40 100755
--- a/tests/topotests/bgp_snmp_bgp4v2mib/test_bgp_snmp_bgp4v2mib.py
+++ b/tests/topotests/bgp_snmp_bgp4v2mib/test_bgp_snmp_bgp4v2mib.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test some of the BGP4V2-MIB entries.
diff --git a/tests/topotests/bgp_snmp_mplsl3vpn/test_bgp_snmp_mplsvpn.py b/tests/topotests/bgp_snmp_mplsl3vpn/test_bgp_snmp_mplsvpn.py
index bc53dfb46..0131e1257 100755
--- a/tests/topotests/bgp_snmp_mplsl3vpn/test_bgp_snmp_mplsvpn.py
+++ b/tests/topotests/bgp_snmp_mplsl3vpn/test_bgp_snmp_mplsvpn.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_snmp_mplsl3vpn.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_snmp_mplsl3vpn.py: Test mplsL3Vpn MIB [RFC4382].
diff --git a/tests/topotests/bgp_soo/test_bgp_soo.py b/tests/topotests/bgp_soo/test_bgp_soo.py
index e3a7334c6..967bed021 100644
--- a/tests/topotests/bgp_soo/test_bgp_soo.py
+++ b/tests/topotests/bgp_soo/test_bgp_soo.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if BGP SoO per neighbor works correctly. Routes having SoO
diff --git a/tests/topotests/bgp_srv6l3vpn_over_ipv6/test_bgp_srv6l3vpn_over_ipv6.py b/tests/topotests/bgp_srv6l3vpn_over_ipv6/test_bgp_srv6l3vpn_over_ipv6.py
index 0b8870cdc..9e529059e 100755
--- a/tests/topotests/bgp_srv6l3vpn_over_ipv6/test_bgp_srv6l3vpn_over_ipv6.py
+++ b/tests/topotests/bgp_srv6l3vpn_over_ipv6/test_bgp_srv6l3vpn_over_ipv6.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -6,20 +7,6 @@
 # Copyright (c) 2018, LabN Consulting, L.L.C.
 # Authored by Lou Berger <lberger@labn.net>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import re
diff --git a/tests/topotests/bgp_srv6l3vpn_route_leak/test_bgp_srv6l3vpn_route_leak.py b/tests/topotests/bgp_srv6l3vpn_route_leak/test_bgp_srv6l3vpn_route_leak.py
index 16f8adb3c..900d0c296 100755
--- a/tests/topotests/bgp_srv6l3vpn_route_leak/test_bgp_srv6l3vpn_route_leak.py
+++ b/tests/topotests/bgp_srv6l3vpn_route_leak/test_bgp_srv6l3vpn_route_leak.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2022, LINE Corporation
 # Authored by Ryoga Saito <ryoga.saito@linecorp.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import re
diff --git a/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf/test_bgp_srv6l3vpn_to_bgp_vrf.py b/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf/test_bgp_srv6l3vpn_to_bgp_vrf.py
index 7c23d4c57..fdc1f4eec 100755
--- a/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf/test_bgp_srv6l3vpn_to_bgp_vrf.py
+++ b/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf/test_bgp_srv6l3vpn_to_bgp_vrf.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -6,20 +7,6 @@
 # Copyright (c) 2018, LabN Consulting, L.L.C.
 # Authored by Lou Berger <lberger@labn.net>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import sys
diff --git a/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf2/test_bgp_srv6l3vpn_to_bgp_vrf2.py b/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf2/test_bgp_srv6l3vpn_to_bgp_vrf2.py
index 1209e9d6e..a1202f5d9 100755
--- a/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf2/test_bgp_srv6l3vpn_to_bgp_vrf2.py
+++ b/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf2/test_bgp_srv6l3vpn_to_bgp_vrf2.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -6,20 +7,6 @@
 # Copyright (c) 2018, LabN Consulting, L.L.C.
 # Authored by Lou Berger <lberger@labn.net>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import re
diff --git a/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf3/test_bgp_srv6l3vpn_to_bgp_vrf3.py b/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf3/test_bgp_srv6l3vpn_to_bgp_vrf3.py
index 61ac7418a..eb0f30f84 100644
--- a/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf3/test_bgp_srv6l3vpn_to_bgp_vrf3.py
+++ b/tests/topotests/bgp_srv6l3vpn_to_bgp_vrf3/test_bgp_srv6l3vpn_to_bgp_vrf3.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2022, University of Rome Tor Vergata
 # Authored by Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import re
diff --git a/tests/topotests/bgp_suppress_fib/test_bgp_suppress_fib.py b/tests/topotests/bgp_suppress_fib/test_bgp_suppress_fib.py
index 6d2b65a61..ed8e41903 100644
--- a/tests/topotests/bgp_suppress_fib/test_bgp_suppress_fib.py
+++ b/tests/topotests/bgp_suppress_fib/test_bgp_suppress_fib.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_suppress_fib.py
 #
 # Copyright (c) 2019 by
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 """
diff --git a/tests/topotests/bgp_tcp_mss/test_bgp_tcp_mss.py b/tests/topotests/bgp_tcp_mss/test_bgp_tcp_mss.py
index acf89835e..e7948eaaa 100644
--- a/tests/topotests/bgp_tcp_mss/test_bgp_tcp_mss.py
+++ b/tests/topotests/bgp_tcp_mss/test_bgp_tcp_mss.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_tcp_mss.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2021 by
 # Abhinay Ramesh <rabhinay@vmware.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 bgp_tcp_mss.py:
diff --git a/tests/topotests/bgp_tcp_mss/test_bgp_vrf_tcp_mss.py b/tests/topotests/bgp_tcp_mss/test_bgp_vrf_tcp_mss.py
index 7094c2805..6fe044fce 100644
--- a/tests/topotests/bgp_tcp_mss/test_bgp_vrf_tcp_mss.py
+++ b/tests/topotests/bgp_tcp_mss/test_bgp_vrf_tcp_mss.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # bgp_tcp_mss.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2021 by
 # Shreenidhi A R <rshreenidhi@vmware.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 bgp_tcp_mss_vrf.py:
diff --git a/tests/topotests/bgp_unique_rid/test_bgp_unique_rid.py b/tests/topotests/bgp_unique_rid/test_bgp_unique_rid.py
index 715631053..47b2452b8 100644
--- a/tests/topotests/bgp_unique_rid/test_bgp_unique_rid.py
+++ b/tests/topotests/bgp_unique_rid/test_bgp_unique_rid.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import sys
 import time
diff --git a/tests/topotests/bgp_unique_rid/test_bgp_unique_rid_vrf.py b/tests/topotests/bgp_unique_rid/test_bgp_unique_rid_vrf.py
index e009efee8..2a9e42dff 100644
--- a/tests/topotests/bgp_unique_rid/test_bgp_unique_rid_vrf.py
+++ b/tests/topotests/bgp_unique_rid/test_bgp_unique_rid_vrf.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import sys
 import time
diff --git a/tests/topotests/bgp_unnumbered/test_bgp_unnumbered.py b/tests/topotests/bgp_unnumbered/test_bgp_unnumbered.py
index de4c4cff3..2a53547f5 100644
--- a/tests/topotests/bgp_unnumbered/test_bgp_unnumbered.py
+++ b/tests/topotests/bgp_unnumbered/test_bgp_unnumbered.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2022 by
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test some bgp interface based issues that show up
diff --git a/tests/topotests/bgp_update_delay/test_bgp_update_delay.py b/tests/topotests/bgp_update_delay/test_bgp_update_delay.py
index 1c00c492e..4e66cf554 100644
--- a/tests/topotests/bgp_update_delay/test_bgp_update_delay.py
+++ b/tests/topotests/bgp_update_delay/test_bgp_update_delay.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_update_delay.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Don Slice <dslice@nvidia.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test the ability to define update-delay to delay bestpath, rib install
diff --git a/tests/topotests/bgp_vpn_5549_route_map/test_bgp_vpn_5549_route_map.py b/tests/topotests/bgp_vpn_5549_route_map/test_bgp_vpn_5549_route_map.py
index e567d3654..533af19d9 100644
--- a/tests/topotests/bgp_vpn_5549_route_map/test_bgp_vpn_5549_route_map.py
+++ b/tests/topotests/bgp_vpn_5549_route_map/test_bgp_vpn_5549_route_map.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Check if we can override VPN underlay next-hop from PE1 to PE2.
diff --git a/tests/topotests/bgp_vpnv4_ebgp/test_bgp_vpnv4_ebgp.py b/tests/topotests/bgp_vpnv4_ebgp/test_bgp_vpnv4_ebgp.py
index cd8a9b6d6..342bad20a 100644
--- a/tests/topotests/bgp_vpnv4_ebgp/test_bgp_vpnv4_ebgp.py
+++ b/tests/topotests/bgp_vpnv4_ebgp/test_bgp_vpnv4_ebgp.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_vpnv4_ebgp.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2022 by 6WIND
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
  test_bgp_vpnv4_ebgp.py: Test the FRR BGP daemon with EBGP direct connection
diff --git a/tests/topotests/bgp_vpnv4_gre/test_bgp_vpnv4_gre.py b/tests/topotests/bgp_vpnv4_gre/test_bgp_vpnv4_gre.py
index f562f4417..6f313be62 100644
--- a/tests/topotests/bgp_vpnv4_gre/test_bgp_vpnv4_gre.py
+++ b/tests/topotests/bgp_vpnv4_gre/test_bgp_vpnv4_gre.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_vpnv4_gre.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2021 by 6WIND
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
  test_bgp_vpnv4_gre.py: Test the FRR BGP daemon with BGP IPv6 interface
diff --git a/tests/topotests/bgp_vpnv4_noretain/test_bgp_vpnv4_noretain.py b/tests/topotests/bgp_vpnv4_noretain/test_bgp_vpnv4_noretain.py
index d3b9b75ef..9b8ae4b7e 100644
--- a/tests/topotests/bgp_vpnv4_noretain/test_bgp_vpnv4_noretain.py
+++ b/tests/topotests/bgp_vpnv4_noretain/test_bgp_vpnv4_noretain.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_vpnv4_noretain.py
@@ -6,20 +7,6 @@
 #
 # Copyright 2022 6WIND S.A.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
  test_bgp_vpnv4_noretain.py: Do not keep the VPNvx entries when no
diff --git a/tests/topotests/bgp_vrf_dynamic_route_leak/test_bgp_vrf_dynamic_route_leak_topo1.py b/tests/topotests/bgp_vrf_dynamic_route_leak/test_bgp_vrf_dynamic_route_leak_topo1.py
index 7d71ef761..c34c3ebe1 100644
--- a/tests/topotests/bgp_vrf_dynamic_route_leak/test_bgp_vrf_dynamic_route_leak_topo1.py
+++ b/tests/topotests/bgp_vrf_dynamic_route_leak/test_bgp_vrf_dynamic_route_leak_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Multi-VRF Dynamic Route Leaking:
diff --git a/tests/topotests/bgp_vrf_dynamic_route_leak/test_bgp_vrf_dynamic_route_leak_topo2.py b/tests/topotests/bgp_vrf_dynamic_route_leak/test_bgp_vrf_dynamic_route_leak_topo2.py
index f193317b1..6b9dc3e94 100644
--- a/tests/topotests/bgp_vrf_dynamic_route_leak/test_bgp_vrf_dynamic_route_leak_topo2.py
+++ b/tests/topotests/bgp_vrf_dynamic_route_leak/test_bgp_vrf_dynamic_route_leak_topo2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Multi-VRF Dynamic Route Leaking:
diff --git a/tests/topotests/bgp_vrf_dynamic_route_leak_topo3/test_bgp_vrf_dynamic_route_leak_topo3.py b/tests/topotests/bgp_vrf_dynamic_route_leak_topo3/test_bgp_vrf_dynamic_route_leak_topo3.py
index a9aefc500..1787021eb 100644
--- a/tests/topotests/bgp_vrf_dynamic_route_leak_topo3/test_bgp_vrf_dynamic_route_leak_topo3.py
+++ b/tests/topotests/bgp_vrf_dynamic_route_leak_topo3/test_bgp_vrf_dynamic_route_leak_topo3.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Multi-VRF Dynamic Route Leaking:
diff --git a/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-1.py b/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-1.py
index c51beca72..c7fbc01eb 100644
--- a/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-1.py
+++ b/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Multi-VRF Dynamic Route Leaking:
diff --git a/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-2.py b/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-2.py
index bfeaaa17d..02950eb3d 100644
--- a/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-2.py
+++ b/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Multi-VRF Dynamic Route Leaking:
diff --git a/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-3.py b/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-3.py
index 1d80a2a64..4b1890342 100644
--- a/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-3.py
+++ b/tests/topotests/bgp_vrf_dynamic_route_leak_topo4/test_bgp_vrf_dynamic_route_leak_topo4-3.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP Multi-VRF Dynamic Route Leaking:
diff --git a/tests/topotests/bgp_vrf_leaking_5549_routes/test_bgp_vrf_leaking.py b/tests/topotests/bgp_vrf_leaking_5549_routes/test_bgp_vrf_leaking.py
index dd27ad3ed..244db6c46 100755
--- a/tests/topotests/bgp_vrf_leaking_5549_routes/test_bgp_vrf_leaking.py
+++ b/tests/topotests/bgp_vrf_leaking_5549_routes/test_bgp_vrf_leaking.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2022, LINE Corporation
 # Authored by Ryoga Saito <ryoga.saito@linecorp.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import re
diff --git a/tests/topotests/bgp_vrf_leaking_rt_change_route_maps/test_bgp_vrf_leaking_rt_change_route_maps.py b/tests/topotests/bgp_vrf_leaking_rt_change_route_maps/test_bgp_vrf_leaking_rt_change_route_maps.py
index 36243407d..42cbf1e33 100644
--- a/tests/topotests/bgp_vrf_leaking_rt_change_route_maps/test_bgp_vrf_leaking_rt_change_route_maps.py
+++ b/tests/topotests/bgp_vrf_leaking_rt_change_route_maps/test_bgp_vrf_leaking_rt_change_route_maps.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by
 # Donatas Abraitis <donatas@opensourcerouting.org>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 If we overwrite import/export RT list via route-maps or even flush by using
diff --git a/tests/topotests/bgp_vrf_lite_best_path_test/test_bgp_vrf_lite_best_path_topo1.py b/tests/topotests/bgp_vrf_lite_best_path_test/test_bgp_vrf_lite_best_path_topo1.py
index b95e71c2e..934c4dc05 100644
--- a/tests/topotests/bgp_vrf_lite_best_path_test/test_bgp_vrf_lite_best_path_topo1.py
+++ b/tests/topotests/bgp_vrf_lite_best_path_test/test_bgp_vrf_lite_best_path_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP VRF Lite:
diff --git a/tests/topotests/bgp_vrf_lite_best_path_test/test_bgp_vrf_lite_best_path_topo2.py b/tests/topotests/bgp_vrf_lite_best_path_test/test_bgp_vrf_lite_best_path_topo2.py
index 9291fbd96..5d9396438 100644
--- a/tests/topotests/bgp_vrf_lite_best_path_test/test_bgp_vrf_lite_best_path_topo2.py
+++ b/tests/topotests/bgp_vrf_lite_best_path_test/test_bgp_vrf_lite_best_path_topo2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test BGP VRF Lite:
diff --git a/tests/topotests/bgp_vrf_lite_ipv6_rtadv/test_bgp_vrf_lite_ipv6_rtadv.py b/tests/topotests/bgp_vrf_lite_ipv6_rtadv/test_bgp_vrf_lite_ipv6_rtadv.py
index b70e27315..32239e961 100644
--- a/tests/topotests/bgp_vrf_lite_ipv6_rtadv/test_bgp_vrf_lite_ipv6_rtadv.py
+++ b/tests/topotests/bgp_vrf_lite_ipv6_rtadv/test_bgp_vrf_lite_ipv6_rtadv.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_ipv6_rtadv.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2019 by 6WIND
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
  test_bgp_ipv6_rtadv.py: Test the FRR BGP daemon with BGP IPv6 interface
diff --git a/tests/topotests/bgp_vrf_netns/test_bgp_vrf_netns_topo.py b/tests/topotests/bgp_vrf_netns/test_bgp_vrf_netns_topo.py
index c380cc10b..8457b752a 100644
--- a/tests/topotests/bgp_vrf_netns/test_bgp_vrf_netns_topo.py
+++ b/tests/topotests/bgp_vrf_netns/test_bgp_vrf_netns_topo.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_vrf_netns_topo1.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2018 by 6WIND
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_vrf_netns_topo1.py: Test BGP topology with EBGP on NETNS VRF
diff --git a/tests/topotests/bgp_vrf_route_leak_basic/test_bgp-vrf-route-leak-basic.py b/tests/topotests/bgp_vrf_route_leak_basic/test_bgp-vrf-route-leak-basic.py
index 191a0b53e..fd7ffff17 100644
--- a/tests/topotests/bgp_vrf_route_leak_basic/test_bgp-vrf-route-leak-basic.py
+++ b/tests/topotests/bgp_vrf_route_leak_basic/test_bgp-vrf-route-leak-basic.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp-vrf-route-leak-basic.py
@@ -6,20 +7,6 @@
 # Copyright (c) 2018 Cumulus Networks, Inc.
 #                    Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND Cumulus Networks DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp-vrf-route-leak-basic.py.py: Test basic vrf route leaking
diff --git a/tests/topotests/config_timing/test_config_timing.py b/tests/topotests/config_timing/test_config_timing.py
index 0e5508b56..fec9d485b 100644
--- a/tests/topotests/config_timing/test_config_timing.py
+++ b/tests/topotests/config_timing/test_config_timing.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # June 2 2021, Christian Hopps <chopps@labn.net>
 #
@@ -6,20 +7,6 @@
 # Copyright (c) 2019-2020 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test the timing of config operations.
diff --git a/tests/topotests/cspf_topo1/test_cspf_topo1.py b/tests/topotests/cspf_topo1/test_cspf_topo1.py
index 7fe86cfab..072a2dd13 100644
--- a/tests/topotests/cspf_topo1/test_cspf_topo1.py
+++ b/tests/topotests/cspf_topo1/test_cspf_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_cspf_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2022 by Orange
 # Author: Olivier Dugeon <olivier.dugeon@orange.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_cspf_topo1.py: Test the FRR Constraint Shortest Path First algorithm.
diff --git a/tests/topotests/docker/build.sh b/tests/topotests/docker/build.sh
index 70ce2efe8..aec20587b 100755
--- a/tests/topotests/docker/build.sh
+++ b/tests/topotests/docker/build.sh
@@ -1,26 +1,7 @@
 #!/bin/bash
+# SPDX-License-Identifier: MIT
 #
 # Copyright 2018 Network Device Education Foundation, Inc. ("NetDEF")
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be
-# included in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
-# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
 
 cd "$(dirname "$0")"/..
 
diff --git a/tests/topotests/docker/frr-topotests.sh b/tests/topotests/docker/frr-topotests.sh
index 1eaaea297..ce373d9bd 100755
--- a/tests/topotests/docker/frr-topotests.sh
+++ b/tests/topotests/docker/frr-topotests.sh
@@ -1,26 +1,7 @@
 #!/bin/bash
+# SPDX-License-Identifier: MIT
 #
 # Copyright 2018 Network Device Education Foundation, Inc. ("NetDEF")
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be
-# included in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
-# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
 
 set -e
 
diff --git a/tests/topotests/docker/inner/compile_frr.sh b/tests/topotests/docker/inner/compile_frr.sh
index 495beaf3c..3b296a149 100755
--- a/tests/topotests/docker/inner/compile_frr.sh
+++ b/tests/topotests/docker/inner/compile_frr.sh
@@ -1,26 +1,7 @@
 #!/bin/bash
+# SPDX-License-Identifier: MIT
 #
 # Copyright 2018 Network Device Education Foundation, Inc. ("NetDEF")
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be
-# included in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
-# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
 
 set -e
 
diff --git a/tests/topotests/docker/inner/entrypoint.sh b/tests/topotests/docker/inner/entrypoint.sh
index 451d0a27d..44e16db4b 100755
--- a/tests/topotests/docker/inner/entrypoint.sh
+++ b/tests/topotests/docker/inner/entrypoint.sh
@@ -1,26 +1,7 @@
 #!/bin/bash
+# SPDX-License-Identifier: MIT
 #
 # Copyright 2018 Network Device Education Foundation, Inc. ("NetDEF")
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be
-# included in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
-# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
 
 # Load shared functions
 CDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
diff --git a/tests/topotests/docker/inner/funcs.sh b/tests/topotests/docker/inner/funcs.sh
index d78d5006b..4ebacbb23 100755
--- a/tests/topotests/docker/inner/funcs.sh
+++ b/tests/topotests/docker/inner/funcs.sh
@@ -1,26 +1,7 @@
 #!/bin/bash
+# SPDX-License-Identifier: MIT
 #
 # Copyright 2018 Network Device Education Foundation, Inc. ("NetDEF")
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be
-# included in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
-# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
 
 FRR_HOST_DIR=/root/host-frr
 FRR_BUILD_DIR=/root/persist/frr-build
diff --git a/tests/topotests/docker/inner/openvswitch.sh b/tests/topotests/docker/inner/openvswitch.sh
index 67142f04c..926a25ca6 100755
--- a/tests/topotests/docker/inner/openvswitch.sh
+++ b/tests/topotests/docker/inner/openvswitch.sh
@@ -1,26 +1,7 @@
 #!/bin/bash
+# SPDX-License-Identifier: MIT
 #
 # Copyright 2018 Network Device Education Foundation, Inc. ("NetDEF")
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be
-# included in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
-# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
 
 # Load shared functions
 CDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
diff --git a/tests/topotests/eigrp_topo1/test_eigrp_topo1.py b/tests/topotests/eigrp_topo1/test_eigrp_topo1.py
index 8b7c9fc6d..3c9392c3f 100644
--- a/tests/topotests/eigrp_topo1/test_eigrp_topo1.py
+++ b/tests/topotests/eigrp_topo1/test_eigrp_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_eigrp_topo1.py
@@ -7,20 +8,6 @@
 # Cumulus Networks, Inc.
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_eigrp_topo1.py: Testing EIGRP
diff --git a/tests/topotests/evpn_pim_1/test_evpn_pim_topo1.py b/tests/topotests/evpn_pim_1/test_evpn_pim_topo1.py
index 6d5c096c0..c0621d75a 100644
--- a/tests/topotests/evpn_pim_1/test_evpn_pim_topo1.py
+++ b/tests/topotests/evpn_pim_1/test_evpn_pim_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_evpn-pim_topo1.py
@@ -7,20 +8,6 @@
 # Cumulus Networks, Inc.
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_evpn_pim_topo1.py: Testing evpn-pim
diff --git a/tests/topotests/evpn_type5_test_topo1/test_evpn_type5_chaos_topo1.py b/tests/topotests/evpn_type5_test_topo1/test_evpn_type5_chaos_topo1.py
index e92c1c30d..45868663a 100644
--- a/tests/topotests/evpn_type5_test_topo1/test_evpn_type5_chaos_topo1.py
+++ b/tests/topotests/evpn_type5_test_topo1/test_evpn_type5_chaos_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test EVPN-Type5 functionality:
diff --git a/tests/topotests/evpn_type5_test_topo1/test_evpn_type5_topo1.py b/tests/topotests/evpn_type5_test_topo1/test_evpn_type5_topo1.py
index 3ce6c6cb5..10d216ab1 100644
--- a/tests/topotests/evpn_type5_test_topo1/test_evpn_type5_topo1.py
+++ b/tests/topotests/evpn_type5_test_topo1/test_evpn_type5_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test EVPN-Type5 functionality:
diff --git a/tests/topotests/example_test/test_template.py b/tests/topotests/example_test/test_template.py
index 4c073f259..27975483a 100644
--- a/tests/topotests/example_test/test_template.py
+++ b/tests/topotests/example_test/test_template.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: ISC
 #
 # <template>.py
 # Part of NetDEF Topology Tests
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 <template>.py: Test <template>.
diff --git a/tests/topotests/example_test/test_template_json.py b/tests/topotests/example_test/test_template_json.py
index 42e8bc6e7..7a53260a1 100644
--- a/tests/topotests/example_test/test_template_json.py
+++ b/tests/topotests/example_test/test_template_json.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
 #
 # September 5 2021, Christian Hopps <chopps@labn.net>
 #
@@ -6,20 +7,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 <template>.py: Test <template>.
diff --git a/tests/topotests/example_topojson_test/test_topo_json_multiple_links/test_example_topojson_multiple_links.py b/tests/topotests/example_topojson_test/test_topo_json_multiple_links/test_example_topojson_multiple_links.py
index fe4a25648..49afc82f4 100755
--- a/tests/topotests/example_topojson_test/test_topo_json_multiple_links/test_example_topojson_multiple_links.py
+++ b/tests/topotests/example_topojson_test/test_topo_json_multiple_links/test_example_topojson_multiple_links.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 <example>.py: Test <example tests>.
diff --git a/tests/topotests/example_topojson_test/test_topo_json_single_link/test_example_topojson.py b/tests/topotests/example_topojson_test/test_topo_json_single_link/test_example_topojson.py
index 8bc28528d..120399c82 100755
--- a/tests/topotests/example_topojson_test/test_topo_json_single_link/test_example_topojson.py
+++ b/tests/topotests/example_topojson_test/test_topo_json_single_link/test_example_topojson.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc. ("NetDEF")
 # in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 <example>.py: Test <example tests>.
diff --git a/tests/topotests/example_topojson_test/test_topo_json_single_link_loopback/test_example_topojson.py b/tests/topotests/example_topojson_test/test_topo_json_single_link_loopback/test_example_topojson.py
index caf0a7c13..4f3a8d82a 100755
--- a/tests/topotests/example_topojson_test/test_topo_json_single_link_loopback/test_example_topojson.py
+++ b/tests/topotests/example_topojson_test/test_topo_json_single_link_loopback/test_example_topojson.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 <example>.py: Test <example tests>.
diff --git a/tests/topotests/grpc_basic/test_basic_grpc.py b/tests/topotests/grpc_basic/test_basic_grpc.py
index 6bd0be9fd..88bfa98d2 100644
--- a/tests/topotests/grpc_basic/test_basic_grpc.py
+++ b/tests/topotests/grpc_basic/test_basic_grpc.py
@@ -1,23 +1,10 @@
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # February 21 2022, Christian Hopps <chopps@labn.net>
 #
 # Copyright (c) 2022, LabN Consulting, L.L.C.
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-#
 """
 test_basic_grpc.py: Test Basic gRPC.
 """
diff --git a/tests/topotests/isis_lfa_topo1/test_isis_lfa_topo1.py b/tests/topotests/isis_lfa_topo1/test_isis_lfa_topo1.py
index 012814919..44b3dd0b7 100755
--- a/tests/topotests/isis_lfa_topo1/test_isis_lfa_topo1.py
+++ b/tests/topotests/isis_lfa_topo1/test_isis_lfa_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_isis_tilfa_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_isis_lfa_topo1.py:
diff --git a/tests/topotests/isis_lsp_bits_topo1/test_isis_lsp_bits_topo1.py b/tests/topotests/isis_lsp_bits_topo1/test_isis_lsp_bits_topo1.py
index 9b4cd9511..c4ce6a30c 100755
--- a/tests/topotests/isis_lsp_bits_topo1/test_isis_lsp_bits_topo1.py
+++ b/tests/topotests/isis_lsp_bits_topo1/test_isis_lsp_bits_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_isis_lsp_bits_topo1.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2021 by  Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_isis_lsp_bits_topo1.py:
diff --git a/tests/topotests/isis_rlfa_topo1/test_isis_rlfa_topo1.py b/tests/topotests/isis_rlfa_topo1/test_isis_rlfa_topo1.py
index ba0543a82..15327fe03 100755
--- a/tests/topotests/isis_rlfa_topo1/test_isis_rlfa_topo1.py
+++ b/tests/topotests/isis_rlfa_topo1/test_isis_rlfa_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_isis_rlfa_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_isis_rlfa_topo1.py:
diff --git a/tests/topotests/isis_snmp/test_isis_snmp.py b/tests/topotests/isis_snmp/test_isis_snmp.py
index 206291a85..ddef08008 100755
--- a/tests/topotests/isis_snmp/test_isis_snmp.py
+++ b/tests/topotests/isis_snmp/test_isis_snmp.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_isis_snmp.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_isis_snmp.py:
diff --git a/tests/topotests/isis_sr_te_topo1/test_isis_sr_te_topo1.py b/tests/topotests/isis_sr_te_topo1/test_isis_sr_te_topo1.py
index b3b14b557..fc2ce7cb4 100755
--- a/tests/topotests/isis_sr_te_topo1/test_isis_sr_te_topo1.py
+++ b/tests/topotests/isis_sr_te_topo1/test_isis_sr_te_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_isis_sr_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_isis_sr_te_topo1.py:
diff --git a/tests/topotests/isis_sr_topo1/test_isis_sr_topo1.py b/tests/topotests/isis_sr_topo1/test_isis_sr_topo1.py
index 40a7b76af..40b87e3a9 100644
--- a/tests/topotests/isis_sr_topo1/test_isis_sr_topo1.py
+++ b/tests/topotests/isis_sr_topo1/test_isis_sr_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_isis_sr_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_isis_sr_topo1.py:
diff --git a/tests/topotests/isis_te_topo1/test_isis_te_topo1.py b/tests/topotests/isis_te_topo1/test_isis_te_topo1.py
index 213b3f9f3..9c70e0578 100644
--- a/tests/topotests/isis_te_topo1/test_isis_te_topo1.py
+++ b/tests/topotests/isis_te_topo1/test_isis_te_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_isis_te_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2021 by Orange
 # Author: Olivier Dugeon <olivier.dugeon@orange.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_isis_te_topo1.py: Test the FRR IS-IS with Traffic Engineering.
diff --git a/tests/topotests/isis_tilfa_topo1/test_isis_tilfa_topo1.py b/tests/topotests/isis_tilfa_topo1/test_isis_tilfa_topo1.py
index 213439d3f..1ed52ab76 100755
--- a/tests/topotests/isis_tilfa_topo1/test_isis_tilfa_topo1.py
+++ b/tests/topotests/isis_tilfa_topo1/test_isis_tilfa_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_isis_tilfa_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_isis_tilfa_topo1.py:
diff --git a/tests/topotests/isis_topo1/test_isis_topo1.py b/tests/topotests/isis_topo1/test_isis_topo1.py
index 8b6c3772b..608ef48ff 100644
--- a/tests/topotests/isis_topo1/test_isis_topo1.py
+++ b/tests/topotests/isis_topo1/test_isis_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_isis_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_isis_topo1.py: Test ISIS topology.
diff --git a/tests/topotests/isis_topo1_vrf/test_isis_topo1_vrf.py b/tests/topotests/isis_topo1_vrf/test_isis_topo1_vrf.py
index ff9ad6150..032319c44 100644
--- a/tests/topotests/isis_topo1_vrf/test_isis_topo1_vrf.py
+++ b/tests/topotests/isis_topo1_vrf/test_isis_topo1_vrf.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by  Niral Networks, Inc. ("Niral Networks")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_isis_topo1_vrf.py: Test ISIS vrf topology.
diff --git a/tests/topotests/ldp_oc_acl_topo1/test_ldp_oc_acl_topo1.py b/tests/topotests/ldp_oc_acl_topo1/test_ldp_oc_acl_topo1.py
index 01f3fe182..c2bcaa84c 100644
--- a/tests/topotests/ldp_oc_acl_topo1/test_ldp_oc_acl_topo1.py
+++ b/tests/topotests/ldp_oc_acl_topo1/test_ldp_oc_acl_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ldp_oc_acl_topo1.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 test_ldp_oc_acl_topo1.py: Simple FRR LDP Test
diff --git a/tests/topotests/ldp_oc_topo1/test_ldp_oc_topo1.py b/tests/topotests/ldp_oc_topo1/test_ldp_oc_topo1.py
index 4faaf45c1..387fd89c2 100644
--- a/tests/topotests/ldp_oc_topo1/test_ldp_oc_topo1.py
+++ b/tests/topotests/ldp_oc_topo1/test_ldp_oc_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ldp_oc_topo1.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 test_ldp_oc_topo1.py: Simple FRR LDP Test
diff --git a/tests/topotests/ldp_snmp/test_ldp_snmp_topo1.py b/tests/topotests/ldp_snmp/test_ldp_snmp_topo1.py
index b198f2936..52a67d8bb 100644
--- a/tests/topotests/ldp_snmp/test_ldp_snmp_topo1.py
+++ b/tests/topotests/ldp_snmp/test_ldp_snmp_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ldp_isis_topo1.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ldp_vpls_topo1.py:
diff --git a/tests/topotests/ldp_sync_isis_topo1/test_ldp_sync_isis_topo1.py b/tests/topotests/ldp_sync_isis_topo1/test_ldp_sync_isis_topo1.py
index 48584f042..cb6b784d6 100644
--- a/tests/topotests/ldp_sync_isis_topo1/test_ldp_sync_isis_topo1.py
+++ b/tests/topotests/ldp_sync_isis_topo1/test_ldp_sync_isis_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ldp_isis_topo1.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ldp_vpls_topo1.py:
diff --git a/tests/topotests/ldp_sync_ospf_topo1/test_ldp_sync_ospf_topo1.py b/tests/topotests/ldp_sync_ospf_topo1/test_ldp_sync_ospf_topo1.py
index dc6e1a767..760b4e3df 100644
--- a/tests/topotests/ldp_sync_ospf_topo1/test_ldp_sync_ospf_topo1.py
+++ b/tests/topotests/ldp_sync_ospf_topo1/test_ldp_sync_ospf_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ldp_ospf_topo1.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ldp_vpls_topo1.py:
diff --git a/tests/topotests/ldp_topo1/test_ldp_topo1.py b/tests/topotests/ldp_topo1/test_ldp_topo1.py
index cb8adfb55..fdd75581a 100644
--- a/tests/topotests/ldp_topo1/test_ldp_topo1.py
+++ b/tests/topotests/ldp_topo1/test_ldp_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_bgp_multiview_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2016 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 test_ldp_topo1.py: Simple FRR LDP Test
diff --git a/tests/topotests/ldp_vpls_topo1/test_ldp_vpls_topo1.py b/tests/topotests/ldp_vpls_topo1/test_ldp_vpls_topo1.py
index 8a41ea510..1f4a4b5fd 100644
--- a/tests/topotests/ldp_vpls_topo1/test_ldp_vpls_topo1.py
+++ b/tests/topotests/ldp_vpls_topo1/test_ldp_vpls_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ldp_vpls_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ldp_vpls_topo1.py:
diff --git a/tests/topotests/lib/bgp.py b/tests/topotests/lib/bgp.py
index aa7b4a217..a0b12b2d6 100644
--- a/tests/topotests/lib/bgp.py
+++ b/tests/topotests/lib/bgp.py
@@ -1,22 +1,9 @@
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import ipaddress
 import sys
diff --git a/tests/topotests/lib/bgprib.py b/tests/topotests/lib/bgprib.py
index 35a57d0a9..cd449cb50 100644
--- a/tests/topotests/lib/bgprib.py
+++ b/tests/topotests/lib/bgprib.py
@@ -1,20 +1,7 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # Copyright 2018, LabN Consulting, L.L.C.
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 #
 # want_rd_routes = [
diff --git a/tests/topotests/lib/common_config.py b/tests/topotests/lib/common_config.py
index 8ed37d1a8..3e02769d8 100644
--- a/tests/topotests/lib/common_config.py
+++ b/tests/topotests/lib/common_config.py
@@ -1,22 +1,9 @@
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import ipaddress
 import json
diff --git a/tests/topotests/lib/fixtures.py b/tests/topotests/lib/fixtures.py
index 9d8f63aac..042ed09d4 100644
--- a/tests/topotests/lib/fixtures.py
+++ b/tests/topotests/lib/fixtures.py
@@ -1,26 +1,9 @@
 # -*- coding: utf-8 eval: (yapf-mode 1) -*-
+# SPDX-License-Identifier: MIT
 #
 # August 27 2021, Christian Hopps <chopps@labn.net>
 #
 # Copyright (c) 2021, LabN Consulting, L.L.C. ("LabN")
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
 
 import lib.topojson as topojson
 import lib.topogen as topogen
diff --git a/tests/topotests/lib/grpc-query.py b/tests/topotests/lib/grpc-query.py
index 61f01c36b..6457bbefd 100755
--- a/tests/topotests/lib/grpc-query.py
+++ b/tests/topotests/lib/grpc-query.py
@@ -1,27 +1,10 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: MIT
 #
 # February 22 2022, Christian Hopps <chopps@labn.net>
 #
 # Copyright (c) 2022, LabN Consulting, L.L.C.
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
 
 import argparse
 import logging
diff --git a/tests/topotests/lib/ltemplate.py b/tests/topotests/lib/ltemplate.py
index 2544023c4..e897a8103 100644
--- a/tests/topotests/lib/ltemplate.py
+++ b/tests/topotests/lib/ltemplate.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Part of NetDEF Topology Tests
@@ -6,20 +7,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 ltemplate.py: LabN template for FRR tests.
diff --git a/tests/topotests/lib/lutil.py b/tests/topotests/lib/lutil.py
index 62c21e9ce..9aef41cd1 100644
--- a/tests/topotests/lib/lutil.py
+++ b/tests/topotests/lib/lutil.py
@@ -1,20 +1,7 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # Copyright 2017, LabN Consulting, L.L.C.
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 import os
 import re
diff --git a/tests/topotests/lib/mcast-tester.py b/tests/topotests/lib/mcast-tester.py
index 30beccb78..8a8251010 100755
--- a/tests/topotests/lib/mcast-tester.py
+++ b/tests/topotests/lib/mcast-tester.py
@@ -1,19 +1,8 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
 #
 # Copyright (C) 2021 by
 # Network Device Education Foundation, Inc. ("NetDEF")
-#
-# Permission to use, copy, modify, and/or distribute this software for any
-# purpose with or without fee is hereby granted, provided that the above
-# copyright notice and this permission notice appear in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
-# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
-# AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
-# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
-# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
-# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
-# PERFORMANCE OF THIS SOFTWARE.
 
 """
 Subscribe to a multicast group so that the kernel sends an IGMP JOIN
diff --git a/tests/topotests/lib/micronet.py b/tests/topotests/lib/micronet.py
index ba3d59823..138100916 100644
--- a/tests/topotests/lib/micronet.py
+++ b/tests/topotests/lib/micronet.py
@@ -1,23 +1,10 @@
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # July 9 2021, Christian Hopps <chopps@labn.net>
 #
 # Copyright (c) 2021, LabN Consulting, L.L.C.
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-#
 import datetime
 import logging
 import os
diff --git a/tests/topotests/lib/micronet_cli.py b/tests/topotests/lib/micronet_cli.py
index ef804f6dc..e54b75f71 100644
--- a/tests/topotests/lib/micronet_cli.py
+++ b/tests/topotests/lib/micronet_cli.py
@@ -1,23 +1,10 @@
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # July 24 2021, Christian Hopps <chopps@labn.net>
 #
 # Copyright (c) 2021, LabN Consulting, L.L.C.
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-#
 import argparse
 import logging
 import os
diff --git a/tests/topotests/lib/micronet_compat.py b/tests/topotests/lib/micronet_compat.py
index a3d3f4c68..5a69c56d8 100644
--- a/tests/topotests/lib/micronet_compat.py
+++ b/tests/topotests/lib/micronet_compat.py
@@ -1,23 +1,10 @@
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # July 11 2021, Christian Hopps <chopps@labn.net>
 #
 # Copyright (c) 2021, LabN Consulting, L.L.C
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-#
 
 import glob
 import logging
diff --git a/tests/topotests/lib/ospf.py b/tests/topotests/lib/ospf.py
index 59ae1a255..f1937f45b 100644
--- a/tests/topotests/lib/ospf.py
+++ b/tests/topotests/lib/ospf.py
@@ -1,22 +1,9 @@
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import ipaddress
 import sys
diff --git a/tests/topotests/lib/pim.py b/tests/topotests/lib/pim.py
index 0af1ecf6a..e5af24d41 100644
--- a/tests/topotests/lib/pim.py
+++ b/tests/topotests/lib/pim.py
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: ISC
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
-#
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
 
 import datetime
 import os
diff --git a/tests/topotests/lib/scapy_sendpkt.py b/tests/topotests/lib/scapy_sendpkt.py
index 0bb6a7209..377146e05 100755
--- a/tests/topotests/lib/scapy_sendpkt.py
+++ b/tests/topotests/lib/scapy_sendpkt.py
@@ -1,28 +1,11 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: MIT
 #
 # July 29 2021, Christian Hopps <chopps@labn.net>
 #
 # Copyright (c) 2021, LabN Consulting, L.L.C. ("LabN")
 #
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
-#
 import argparse
 import logging
 import re
diff --git a/tests/topotests/lib/send_bsr_packet.py b/tests/topotests/lib/send_bsr_packet.py
index c22689932..c11de64b1 100755
--- a/tests/topotests/lib/send_bsr_packet.py
+++ b/tests/topotests/lib/send_bsr_packet.py
@@ -1,22 +1,9 @@
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import sys
 import argparse
diff --git a/tests/topotests/lib/snmptest.py b/tests/topotests/lib/snmptest.py
index d69544390..e7cd657b2 100644
--- a/tests/topotests/lib/snmptest.py
+++ b/tests/topotests/lib/snmptest.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: ISC
 #
 # topogen.py
 # Library of helper functions for NetDEF Topology Tests
@@ -5,20 +6,6 @@
 # Copyright (c) 2020 by Volta Networks
 #
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 SNMP library to test snmp walks and gets
diff --git a/tests/topotests/lib/test/test_json.py b/tests/topotests/lib/test/test_json.py
index 7b3c8593c..ae58d9b2d 100755
--- a/tests/topotests/lib/test/test_json.py
+++ b/tests/topotests/lib/test/test_json.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_json.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Tests for the json_cmp() function.
diff --git a/tests/topotests/lib/test/test_run_and_expect.py b/tests/topotests/lib/test/test_run_and_expect.py
index d65d5baf3..5e171b232 100755
--- a/tests/topotests/lib/test/test_run_and_expect.py
+++ b/tests/topotests/lib/test/test_run_and_expect.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_run_and_expect.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Tests for the `run_and_expect(_type)()` functions.
diff --git a/tests/topotests/lib/test/test_version.py b/tests/topotests/lib/test/test_version.py
index 7c2df0033..7b18daaa8 100755
--- a/tests/topotests/lib/test/test_version.py
+++ b/tests/topotests/lib/test/test_version.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_version.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Tests for the version_cmp() function.
diff --git a/tests/topotests/lib/topogen.py b/tests/topotests/lib/topogen.py
index 04712eda8..16d89f079 100644
--- a/tests/topotests/lib/topogen.py
+++ b/tests/topotests/lib/topogen.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: ISC
 #
 # topogen.py
 # Library of helper functions for NetDEF Topology Tests
@@ -5,20 +6,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Topogen (Topology Generator) is an abstraction around Topotest and Mininet to
diff --git a/tests/topotests/lib/topojson.py b/tests/topotests/lib/topojson.py
index b49b09e63..53e6945be 100644
--- a/tests/topotests/lib/topojson.py
+++ b/tests/topotests/lib/topojson.py
@@ -1,22 +1,9 @@
+# SPDX-License-Identifier: ISC
 #
 # Modified work Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Original work Copyright (c) 2018 by Network Device Education
 # Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import json
 import ipaddress
diff --git a/tests/topotests/lib/topolog.py b/tests/topotests/lib/topolog.py
index 9cc338620..b50167078 100644
--- a/tests/topotests/lib/topolog.py
+++ b/tests/topotests/lib/topolog.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: ISC
 #
 # topolog.py
 # Library of helper functions for NetDEF Topology Tests
@@ -5,20 +6,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Logging utilities for topology tests.
diff --git a/tests/topotests/lib/topotest.py b/tests/topotests/lib/topotest.py
index 699b53303..0cd60b228 100644
--- a/tests/topotests/lib/topotest.py
+++ b/tests/topotests/lib/topotest.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # topotest.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2016 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import difflib
 import errno
diff --git a/tests/topotests/msdp_mesh_topo1/test_msdp_mesh_topo1.py b/tests/topotests/msdp_mesh_topo1/test_msdp_mesh_topo1.py
index 138e19098..2f31608e6 100644
--- a/tests/topotests/msdp_mesh_topo1/test_msdp_mesh_topo1.py
+++ b/tests/topotests/msdp_mesh_topo1/test_msdp_mesh_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_msdp_mesh_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (C) 2021 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_msdp_mesh_topo1.py: Test the FRR PIM MSDP mesh groups.
diff --git a/tests/topotests/msdp_topo1/test_msdp_topo1.py b/tests/topotests/msdp_topo1/test_msdp_topo1.py
index 46ccd5e59..4a007e7d2 100755
--- a/tests/topotests/msdp_topo1/test_msdp_topo1.py
+++ b/tests/topotests/msdp_topo1/test_msdp_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_msdp_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2021 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_msdp_topo1.py: Test the FRR PIM MSDP peer.
diff --git a/tests/topotests/multicast_pim6_static_rp_topo1/test_multicast_pim6_static_rp1.py b/tests/topotests/multicast_pim6_static_rp_topo1/test_multicast_pim6_static_rp1.py
index a6f876f06..95b4004e1 100755
--- a/tests/topotests/multicast_pim6_static_rp_topo1/test_multicast_pim6_static_rp1.py
+++ b/tests/topotests/multicast_pim6_static_rp_topo1/test_multicast_pim6_static_rp1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test Multicast basic functionality:
diff --git a/tests/topotests/multicast_pim6_static_rp_topo1/test_multicast_pim6_static_rp2.py b/tests/topotests/multicast_pim6_static_rp_topo1/test_multicast_pim6_static_rp2.py
index b615b9b82..2fedb6e51 100755
--- a/tests/topotests/multicast_pim6_static_rp_topo1/test_multicast_pim6_static_rp2.py
+++ b/tests/topotests/multicast_pim6_static_rp_topo1/test_multicast_pim6_static_rp2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test Multicast basic functionality:
diff --git a/tests/topotests/multicast_pim_bsm_topo1/test_mcast_pim_bsmp_01.py b/tests/topotests/multicast_pim_bsm_topo1/test_mcast_pim_bsmp_01.py
index 1f62cb24c..9ee411206 100644
--- a/tests/topotests/multicast_pim_bsm_topo1/test_mcast_pim_bsmp_01.py
+++ b/tests/topotests/multicast_pim_bsm_topo1/test_mcast_pim_bsmp_01.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test PIM BSM processing basic functionality:
diff --git a/tests/topotests/multicast_pim_bsm_topo2/test_mcast_pim_bsmp_02.py b/tests/topotests/multicast_pim_bsm_topo2/test_mcast_pim_bsmp_02.py
index 9ad9f0021..302a77858 100644
--- a/tests/topotests/multicast_pim_bsm_topo2/test_mcast_pim_bsmp_02.py
+++ b/tests/topotests/multicast_pim_bsm_topo2/test_mcast_pim_bsmp_02.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test PIM BSM processing basic functionality:
diff --git a/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_ospf_topo2.py b/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_ospf_topo2.py
index 7034696a8..00d38fe64 100755
--- a/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_ospf_topo2.py
+++ b/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_ospf_topo2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test multicast pim sm:
diff --git a/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_static_routes_topo1.py b/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_static_routes_topo1.py
index 7c6928f66..7c509cd09 100755
--- a/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_static_routes_topo1.py
+++ b/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_static_routes_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test multicast pim sm:
diff --git a/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_transit_router_topo3.py b/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_transit_router_topo3.py
index 181151649..198700100 100755
--- a/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_transit_router_topo3.py
+++ b/tests/topotests/multicast_pim_dr_nondr_test/test_pim_dr_nondr_with_transit_router_topo3.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test multicast pim sm:
diff --git a/tests/topotests/multicast_pim_sm_topo1/test_multicast_pim_sm_topo1.py b/tests/topotests/multicast_pim_sm_topo1/test_multicast_pim_sm_topo1.py
index 531fea95b..1de6eac89 100755
--- a/tests/topotests/multicast_pim_sm_topo1/test_multicast_pim_sm_topo1.py
+++ b/tests/topotests/multicast_pim_sm_topo1/test_multicast_pim_sm_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test multicast pim sm:
diff --git a/tests/topotests/multicast_pim_sm_topo2/test_multicast_pim_sm_topo2.py b/tests/topotests/multicast_pim_sm_topo2/test_multicast_pim_sm_topo2.py
index 044f378fb..17f52cb86 100755
--- a/tests/topotests/multicast_pim_sm_topo2/test_multicast_pim_sm_topo2.py
+++ b/tests/topotests/multicast_pim_sm_topo2/test_multicast_pim_sm_topo2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test multicast pim sm:
diff --git a/tests/topotests/multicast_pim_sm_topo3/test_multicast_pim_sm_topo3.py b/tests/topotests/multicast_pim_sm_topo3/test_multicast_pim_sm_topo3.py
index 16603ae2d..2ffd3a3ac 100755
--- a/tests/topotests/multicast_pim_sm_topo3/test_multicast_pim_sm_topo3.py
+++ b/tests/topotests/multicast_pim_sm_topo3/test_multicast_pim_sm_topo3.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test multicast pim sm:
diff --git a/tests/topotests/multicast_pim_sm_topo3/test_multicast_pim_sm_topo4.py b/tests/topotests/multicast_pim_sm_topo3/test_multicast_pim_sm_topo4.py
index 91ee02602..825281afb 100755
--- a/tests/topotests/multicast_pim_sm_topo3/test_multicast_pim_sm_topo4.py
+++ b/tests/topotests/multicast_pim_sm_topo3/test_multicast_pim_sm_topo4.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test multicast pim sm:
diff --git a/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp.py b/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp.py
index 772f0751e..c492d95d4 100755
--- a/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp.py
+++ b/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test Multicast basic functionality:
diff --git a/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp1.py b/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp1.py
index 06f3c4110..690c92f58 100755
--- a/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp1.py
+++ b/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test Multicast basic functionality:
diff --git a/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp2.py b/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp2.py
index 088b54e33..8aa2e4efa 100755
--- a/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp2.py
+++ b/tests/topotests/multicast_pim_static_rp_topo1/test_multicast_pim_static_rp2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2019 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test Multicast basic functionality:
diff --git a/tests/topotests/multicast_pim_uplink_topo1/test_multicast_pim_uplink_topo1.py b/tests/topotests/multicast_pim_uplink_topo1/test_multicast_pim_uplink_topo1.py
index a750c7fdb..b50573e77 100644
--- a/tests/topotests/multicast_pim_uplink_topo1/test_multicast_pim_uplink_topo1.py
+++ b/tests/topotests/multicast_pim_uplink_topo1/test_multicast_pim_uplink_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Following tests are covered to test multicast pim uplink:
diff --git a/tests/topotests/nhrp_topo/test_nhrp_topo.py b/tests/topotests/nhrp_topo/test_nhrp_topo.py
index e6e551906..879f5250e 100644
--- a/tests/topotests/nhrp_topo/test_nhrp_topo.py
+++ b/tests/topotests/nhrp_topo/test_nhrp_topo.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_nhrp_topo.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2019 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_nhrp_topo.py: Test the FRR/Quagga NHRP daemon
diff --git a/tests/topotests/ospf6_ecmp_inter_area/test_ospf6_ecmp_inter_area.py b/tests/topotests/ospf6_ecmp_inter_area/test_ospf6_ecmp_inter_area.py
index 553f93618..ec15ff9b1 100644
--- a/tests/topotests/ospf6_ecmp_inter_area/test_ospf6_ecmp_inter_area.py
+++ b/tests/topotests/ospf6_ecmp_inter_area/test_ospf6_ecmp_inter_area.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # test_ospf6_ecmp_inter_area.py
 #
@@ -6,20 +7,6 @@
 # Copyright (c) 2016 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 test_ospf6_ecmp_inter_area.py: Test OSPFv3 ECMP inter-area nexthop update
diff --git a/tests/topotests/ospf6_gr_topo1/test_ospf6_gr_topo1.py b/tests/topotests/ospf6_gr_topo1/test_ospf6_gr_topo1.py
index 1876dabed..aa43b977b 100755
--- a/tests/topotests/ospf6_gr_topo1/test_ospf6_gr_topo1.py
+++ b/tests/topotests/ospf6_gr_topo1/test_ospf6_gr_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf6_gr_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2021 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf6_gr_topo1.py:
diff --git a/tests/topotests/ospf6_topo1/test_ospf6_topo1.py b/tests/topotests/ospf6_topo1/test_ospf6_topo1.py
index 53d84e619..564975701 100644
--- a/tests/topotests/ospf6_topo1/test_ospf6_topo1.py
+++ b/tests/topotests/ospf6_topo1/test_ospf6_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf6_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2016 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 test_ospf6_topo1.py:
diff --git a/tests/topotests/ospf6_topo1_vrf/test_ospf6_topo1_vrf.py b/tests/topotests/ospf6_topo1_vrf/test_ospf6_topo1_vrf.py
index f823d5aef..f98299098 100755
--- a/tests/topotests/ospf6_topo1_vrf/test_ospf6_topo1_vrf.py
+++ b/tests/topotests/ospf6_topo1_vrf/test_ospf6_topo1_vrf.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf6_topo1_vrf.py
@@ -8,20 +9,6 @@
 # Used Copyright (c) 2016 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 r"""
 test_ospf6_topo1_vrf.py:
diff --git a/tests/topotests/ospf6_topo2/test_ospf6_topo2.py b/tests/topotests/ospf6_topo2/test_ospf6_topo2.py
index f16e8f396..9ec0266aa 100644
--- a/tests/topotests/ospf6_topo2/test_ospf6_topo2.py
+++ b/tests/topotests/ospf6_topo2/test_ospf6_topo2.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf6_topo2.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2021 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf6_topo2.py: Test the FRR OSPFv3 daemon.
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_asbr_summary_topo1.py b/tests/topotests/ospf_basic_functionality/test_ospf_asbr_summary_topo1.py
index af21290dd..3d15e94a5 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_asbr_summary_topo1.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_asbr_summary_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Summarisation Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_asbr_summary_type7_lsa.py b/tests/topotests/ospf_basic_functionality/test_ospf_asbr_summary_type7_lsa.py
index 988633979..cff59c3a4 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_asbr_summary_type7_lsa.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_asbr_summary_type7_lsa.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Summarisation Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_authentication.py b/tests/topotests/ospf_basic_functionality/test_ospf_authentication.py
index 8a94bf117..40df0b230 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_authentication.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_authentication.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_chaos.py b/tests/topotests/ospf_basic_functionality/test_ospf_chaos.py
index 27c6954d2..124b36a5f 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_chaos.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_chaos.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_ecmp.py b/tests/topotests/ospf_basic_functionality/test_ospf_ecmp.py
index d6bcbd0fc..d58e2503e 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_ecmp.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_ecmp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_ecmp_lan.py b/tests/topotests/ospf_basic_functionality/test_ospf_ecmp_lan.py
index 049c2b83f..6a565571b 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_ecmp_lan.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_ecmp_lan.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_lan.py b/tests/topotests/ospf_basic_functionality/test_ospf_lan.py
index 773e83bd9..53b1be6d7 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_lan.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_lan.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_nssa.py b/tests/topotests/ospf_basic_functionality/test_ospf_nssa.py
index 7391379bb..0c4697cc2 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_nssa.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_nssa.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_p2mp.py b/tests/topotests/ospf_basic_functionality/test_ospf_p2mp.py
index 9e48f8e39..858412f1d 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_p2mp.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_p2mp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_routemaps.py b/tests/topotests/ospf_basic_functionality/test_ospf_routemaps.py
index c41985e0f..dad6d915e 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_routemaps.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_routemaps.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_rte_calc.py b/tests/topotests/ospf_basic_functionality/test_ospf_rte_calc.py
index b9da46090..63c421ec8 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_rte_calc.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_rte_calc.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_single_area.py b/tests/topotests/ospf_basic_functionality/test_ospf_single_area.py
index 37f558b99..39bbab42e 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_single_area.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_single_area.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_gr_helper/test_ospf_gr_helper1.py b/tests/topotests/ospf_gr_helper/test_ospf_gr_helper1.py
index f72cac4f1..1c2659623 100644
--- a/tests/topotests/ospf_gr_helper/test_ospf_gr_helper1.py
+++ b/tests/topotests/ospf_gr_helper/test_ospf_gr_helper1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_gr_helper/test_ospf_gr_helper2.py b/tests/topotests/ospf_gr_helper/test_ospf_gr_helper2.py
index a6b993d14..a3ccb58d3 100644
--- a/tests/topotests/ospf_gr_helper/test_ospf_gr_helper2.py
+++ b/tests/topotests/ospf_gr_helper/test_ospf_gr_helper2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_gr_helper/test_ospf_gr_helper3.py b/tests/topotests/ospf_gr_helper/test_ospf_gr_helper3.py
index 0d3baeb15..64aac2fba 100644
--- a/tests/topotests/ospf_gr_helper/test_ospf_gr_helper3.py
+++ b/tests/topotests/ospf_gr_helper/test_ospf_gr_helper3.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospf_gr_topo1/test_ospf_gr_topo1.py b/tests/topotests/ospf_gr_topo1/test_ospf_gr_topo1.py
index 429b7dc96..ca2a3b287 100755
--- a/tests/topotests/ospf_gr_topo1/test_ospf_gr_topo1.py
+++ b/tests/topotests/ospf_gr_topo1/test_ospf_gr_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_gr_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2021 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf_gr_topo1.py:
diff --git a/tests/topotests/ospf_instance_redistribute/test_ospf_instance_redistribute.py b/tests/topotests/ospf_instance_redistribute/test_ospf_instance_redistribute.py
index 88c236d7a..9dfe5e1b7 100644
--- a/tests/topotests/ospf_instance_redistribute/test_ospf_instance_redistribute.py
+++ b/tests/topotests/ospf_instance_redistribute/test_ospf_instance_redistribute.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_instance_redistribute.py
@@ -7,20 +8,6 @@
 # Nvidia, Inc.
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf_instance_redistribute
diff --git a/tests/topotests/ospf_multi_vrf_bgp_route_leak/test_ospf_multi_vrf_bgp_route_leak.py b/tests/topotests/ospf_multi_vrf_bgp_route_leak/test_ospf_multi_vrf_bgp_route_leak.py
index 0b6b50ec0..792304e19 100644
--- a/tests/topotests/ospf_multi_vrf_bgp_route_leak/test_ospf_multi_vrf_bgp_route_leak.py
+++ b/tests/topotests/ospf_multi_vrf_bgp_route_leak/test_ospf_multi_vrf_bgp_route_leak.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_multi_vrf_bgp_route_leak.py
@@ -6,20 +7,6 @@
 # Copyright (c) 2022 ATCorp
 # Jafar Al-Gharaibeh
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import os
 import sys
diff --git a/tests/topotests/ospf_netns_vrf/test_ospf_netns_vrf.py b/tests/topotests/ospf_netns_vrf/test_ospf_netns_vrf.py
index 621d8079d..2716f6334 100644
--- a/tests/topotests/ospf_netns_vrf/test_ospf_netns_vrf.py
+++ b/tests/topotests/ospf_netns_vrf/test_ospf_netns_vrf.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_netns_vrf.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf_netns_vrf.py: Test OSPF with Network Namespace VRFs.
diff --git a/tests/topotests/ospf_sr_te_topo1/test_ospf_sr_te_topo1.py b/tests/topotests/ospf_sr_te_topo1/test_ospf_sr_te_topo1.py
index 6e992674a..21ae14323 100755
--- a/tests/topotests/ospf_sr_te_topo1/test_ospf_sr_te_topo1.py
+++ b/tests/topotests/ospf_sr_te_topo1/test_ospf_sr_te_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_sr_te_topo1.py
@@ -6,20 +7,6 @@
 # Copyright (c) 2021 by
 # Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf_sr_te_topo1.py:
diff --git a/tests/topotests/ospf_sr_topo1/test_ospf_sr_topo1.py b/tests/topotests/ospf_sr_topo1/test_ospf_sr_topo1.py
index 96e37fdcc..936b438e9 100644
--- a/tests/topotests/ospf_sr_topo1/test_ospf_sr_topo1.py
+++ b/tests/topotests/ospf_sr_topo1/test_ospf_sr_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_sr_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf_sr_topo1.py:
diff --git a/tests/topotests/ospf_suppress_fa/test_ospf_suppress_fa.py b/tests/topotests/ospf_suppress_fa/test_ospf_suppress_fa.py
index 5903649d6..5b1a53b89 100644
--- a/tests/topotests/ospf_suppress_fa/test_ospf_suppress_fa.py
+++ b/tests/topotests/ospf_suppress_fa/test_ospf_suppress_fa.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_suppres_fa.py
 # Carles Kishimoto
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf_suppres_fa.py: Test OSPF suppress-fa feature
diff --git a/tests/topotests/ospf_te_topo1/test_ospf_te_topo1.py b/tests/topotests/ospf_te_topo1/test_ospf_te_topo1.py
index 699cdc905..c8533cfbb 100644
--- a/tests/topotests/ospf_te_topo1/test_ospf_te_topo1.py
+++ b/tests/topotests/ospf_te_topo1/test_ospf_te_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_te_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2021 by Orange
 # Author: Olivier Dugeon <olivier.dugeon@orange.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf_te_topo1.py: Test the FRR OSPF with Traffic Engineering.
diff --git a/tests/topotests/ospf_tilfa_topo1/test_ospf_tilfa_topo1.py b/tests/topotests/ospf_tilfa_topo1/test_ospf_tilfa_topo1.py
index 696cb90d0..f939f3f57 100644
--- a/tests/topotests/ospf_tilfa_topo1/test_ospf_tilfa_topo1.py
+++ b/tests/topotests/ospf_tilfa_topo1/test_ospf_tilfa_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_tilfa_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf_tilfa_topo1.py:
diff --git a/tests/topotests/ospf_topo1/test_ospf_topo1.py b/tests/topotests/ospf_topo1/test_ospf_topo1.py
index 37facfc5d..a079f5698 100644
--- a/tests/topotests/ospf_topo1/test_ospf_topo1.py
+++ b/tests/topotests/ospf_topo1/test_ospf_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf_topo1.py: Test the FRR OSPF routing daemon.
diff --git a/tests/topotests/ospf_unnumbered/test_ospf_unnumbered.py b/tests/topotests/ospf_unnumbered/test_ospf_unnumbered.py
index a9640adca..d07f5dc5c 100644
--- a/tests/topotests/ospf_unnumbered/test_ospf_unnumbered.py
+++ b/tests/topotests/ospf_unnumbered/test_ospf_unnumbered.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ospf_unnumbered.py
@@ -7,20 +8,6 @@
 # Cumulus Networks, Inc
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ospf_unnumbered.py: Test the OSPF unnumbered.
diff --git a/tests/topotests/ospfapi/ctester.py b/tests/topotests/ospfapi/ctester.py
index 8fd202a02..ab23744ed 100755
--- a/tests/topotests/ospfapi/ctester.py
+++ b/tests/topotests/ospfapi/ctester.py
@@ -1,27 +1,10 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: MIT
 #
 # January 17 2022, Christian Hopps <chopps@labn.net>
 #
 # Copyright 2022, LabN Consulting, L.L.C.
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
 import argparse
 import asyncio
 import logging
diff --git a/tests/topotests/ospfapi/test_ospf_clientapi.py b/tests/topotests/ospfapi/test_ospf_clientapi.py
index 94c8c5c73..7622a4ca5 100644
--- a/tests/topotests/ospfapi/test_ospf_clientapi.py
+++ b/tests/topotests/ospfapi/test_ospf_clientapi.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # Copyright (c) 2021-2022, LabN Consulting, L.L.C.
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-#
 
 """
 test_ospf_clientapi.py: Test the OSPF client API.
diff --git a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_asbr_summary_topo1.py b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_asbr_summary_topo1.py
index b8fbbb3f6..55166367c 100644
--- a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_asbr_summary_topo1.py
+++ b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_asbr_summary_topo1.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Summarisation Functionality Automation."""
diff --git a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_authentication.py b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_authentication.py
index 0fe0fd95b..2f90c9878 100644
--- a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_authentication.py
+++ b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_authentication.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_ecmp.py b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_ecmp.py
index 6bb88ebca..472364e84 100644
--- a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_ecmp.py
+++ b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_ecmp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_ecmp_lan.py b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_ecmp_lan.py
index 5cbfb0d6e..6b3e16965 100644
--- a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_ecmp_lan.py
+++ b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_ecmp_lan.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_nssa2.py b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_nssa2.py
index 4cccd9734..138112775 100644
--- a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_nssa2.py
+++ b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_nssa2.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_routemaps.py b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_routemaps.py
index ee15a5fe1..b2cd0da24 100644
--- a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_routemaps.py
+++ b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_routemaps.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_rte_calc.py b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_rte_calc.py
index e5b20db6d..9e7f112ef 100644
--- a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_rte_calc.py
+++ b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_rte_calc.py
@@ -1,23 +1,10 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_single_area.py b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_single_area.py
index 6aee3b815..5d5ba1480 100644
--- a/tests/topotests/ospfv3_basic_functionality/test_ospfv3_single_area.py
+++ b/tests/topotests/ospfv3_basic_functionality/test_ospfv3_single_area.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2021 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
 # ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """OSPF Basic Functionality Automation."""
diff --git a/tests/topotests/pbr_topo1/test_pbr_topo1.py b/tests/topotests/pbr_topo1/test_pbr_topo1.py
index 8506a1513..a5a29f7e3 100644
--- a/tests/topotests/pbr_topo1/test_pbr_topo1.py
+++ b/tests/topotests/pbr_topo1/test_pbr_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_pbr_topo1.py
@@ -7,20 +8,6 @@
 # Cumulus Networks, Inc.
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_pbr_topo1.py: Testing PBR
diff --git a/tests/topotests/pim_acl/test_pim_acl.py b/tests/topotests/pim_acl/test_pim_acl.py
index a4e6630f7..6e5092dab 100755
--- a/tests/topotests/pim_acl/test_pim_acl.py
+++ b/tests/topotests/pim_acl/test_pim_acl.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_pim_acl.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_pim_acl.py: Test PIM with RP selection using ACLs
diff --git a/tests/topotests/pim_basic/mcast-rx.py b/tests/topotests/pim_basic/mcast-rx.py
index 885337666..d05ed1a49 100755
--- a/tests/topotests/pim_basic/mcast-rx.py
+++ b/tests/topotests/pim_basic/mcast-rx.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
 #
 # mcast-rx.py
 #
 # Copyright (c) 2018 Cumulus Networks, Inc.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND Cumulus Networks DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
 Subscribe to a multicast group so that the kernel sends an IGMP JOIN
 for the multicast group we subscribed to.
diff --git a/tests/topotests/pim_basic/mcast-tx.py b/tests/topotests/pim_basic/mcast-tx.py
index 88c234573..ed3faf488 100755
--- a/tests/topotests/pim_basic/mcast-tx.py
+++ b/tests/topotests/pim_basic/mcast-tx.py
@@ -1,23 +1,10 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: ISC
 #
 # mcast-tx.py
 #
 # Copyright (c) 2018 Cumulus Networks, Inc.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND Cumulus Networks DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 import argparse
 import logging
diff --git a/tests/topotests/pim_basic/test_pim.py b/tests/topotests/pim_basic/test_pim.py
index ca01a5663..24987e516 100644
--- a/tests/topotests/pim_basic/test_pim.py
+++ b/tests/topotests/pim_basic/test_pim.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_pim.py
@@ -6,20 +7,6 @@
 # Copyright (c) 2018 Cumulus Networks, Inc.
 #                    Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND Cumulus Networks DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_pim.py: Test pim
diff --git a/tests/topotests/pim_basic_topo2/test_pim_basic_topo2.py b/tests/topotests/pim_basic_topo2/test_pim_basic_topo2.py
index 5aa313137..cb6d0d7ae 100644
--- a/tests/topotests/pim_basic_topo2/test_pim_basic_topo2.py
+++ b/tests/topotests/pim_basic_topo2/test_pim_basic_topo2.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_pim_basic_topo2.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2021 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_pim_basic_topo2.py: Test the FRR PIM protocol convergence.
diff --git a/tests/topotests/pim_igmp_vrf/test_pim_vrf.py b/tests/topotests/pim_igmp_vrf/test_pim_vrf.py
index 64001dead..ddc430330 100755
--- a/tests/topotests/pim_igmp_vrf/test_pim_vrf.py
+++ b/tests/topotests/pim_igmp_vrf/test_pim_vrf.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_pim_vrf.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_pim_vrf.py: Test PIM with VRFs.
diff --git a/tests/topotests/rip_topo1/test_rip_topo1.py b/tests/topotests/rip_topo1/test_rip_topo1.py
index 7d59e8422..d23962b77 100644
--- a/tests/topotests/rip_topo1/test_rip_topo1.py
+++ b/tests/topotests/rip_topo1/test_rip_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_rip_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_rip_topo1.py: Testing RIPv2
diff --git a/tests/topotests/ripng_topo1/test_ripng_topo1.py b/tests/topotests/ripng_topo1/test_ripng_topo1.py
index 563c4f749..ce2f5986d 100644
--- a/tests/topotests/ripng_topo1/test_ripng_topo1.py
+++ b/tests/topotests/ripng_topo1/test_ripng_topo1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_ripng_topo1.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2017 by
 # Network Device Education Foundation, Inc. ("NetDEF")
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_ripng_topo1.py: Test of RIPng Topology
diff --git a/tests/topotests/route_scale/scale_test_common.py b/tests/topotests/route_scale/scale_test_common.py
index b9f324d56..6227e81b9 100644
--- a/tests/topotests/route_scale/scale_test_common.py
+++ b/tests/topotests/route_scale/scale_test_common.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # scale_test_common.py
@@ -7,20 +8,6 @@
 # Cumulus Networks, Inc.
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 scale_test_common.py: Common routines for testing route scale
diff --git a/tests/topotests/route_scale/test_route_scale1.py b/tests/topotests/route_scale/test_route_scale1.py
index b563883b4..0f25b28c7 100644
--- a/tests/topotests/route_scale/test_route_scale1.py
+++ b/tests/topotests/route_scale/test_route_scale1.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_route_scale1.py
@@ -7,20 +8,6 @@
 # Nvidia, Inc.
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_route_scale1.py: Testing route scale
diff --git a/tests/topotests/route_scale/test_route_scale2.py b/tests/topotests/route_scale/test_route_scale2.py
index 7045995f2..3b55fcd8f 100644
--- a/tests/topotests/route_scale/test_route_scale2.py
+++ b/tests/topotests/route_scale/test_route_scale2.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_route_scale2.py
@@ -7,20 +8,6 @@
 # Nvidia, Inc.
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NVIDIA DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NVIDIA BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_route_scale2.py: Testing route scale
diff --git a/tests/topotests/simple_snmp_test/test_simple_snmp.py b/tests/topotests/simple_snmp_test/test_simple_snmp.py
index 1ca06c657..ee02c7b51 100755
--- a/tests/topotests/simple_snmp_test/test_simple_snmp.py
+++ b/tests/topotests/simple_snmp_test/test_simple_snmp.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_simple_snmp.py
@@ -6,20 +7,6 @@
 #
 # Copyright (c) 2020 by Volta Networks
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_bgp_simple snmp.py: Test snmp infrastructure.
diff --git a/tests/topotests/srv6_locator/test_srv6_locator.py b/tests/topotests/srv6_locator/test_srv6_locator.py
index b918da065..3a27d9c2f 100755
--- a/tests/topotests/srv6_locator/test_srv6_locator.py
+++ b/tests/topotests/srv6_locator/test_srv6_locator.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_srv6_manager.py
@@ -7,20 +8,6 @@
 # Copyright (c) 2020 by
 # LINE Corporation, Hiroki Shirokura <slank.dev@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_srv6_manager.py:
diff --git a/tests/topotests/srv6_locator_custom_bits_length/test_srv6_locator.py b/tests/topotests/srv6_locator_custom_bits_length/test_srv6_locator.py
index 4bd0682bd..92980d3b1 100755
--- a/tests/topotests/srv6_locator_custom_bits_length/test_srv6_locator.py
+++ b/tests/topotests/srv6_locator_custom_bits_length/test_srv6_locator.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2022, University of Rome Tor Vergata
 # Authored by Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_srv6_manager.py:
diff --git a/tests/topotests/srv6_locator_usid/test_srv6_locator_usid.py b/tests/topotests/srv6_locator_usid/test_srv6_locator_usid.py
index 402355552..54187351b 100755
--- a/tests/topotests/srv6_locator_usid/test_srv6_locator_usid.py
+++ b/tests/topotests/srv6_locator_usid/test_srv6_locator_usid.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2022, University of Rome Tor Vergata
 # Authored by Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_srv6_locator_usid.py:
diff --git a/tests/topotests/static_routing_with_ebgp/test_static_routes_topo1_ebgp.py b/tests/topotests/static_routing_with_ebgp/test_static_routes_topo1_ebgp.py
index abfba029f..63c0a8689 100644
--- a/tests/topotests/static_routing_with_ebgp/test_static_routes_topo1_ebgp.py
+++ b/tests/topotests/static_routing_with_ebgp/test_static_routes_topo1_ebgp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
 
     -Verify static route ECMP functionality with 2 next hop.
diff --git a/tests/topotests/static_routing_with_ebgp/test_static_routes_topo2_ebgp.py b/tests/topotests/static_routing_with_ebgp/test_static_routes_topo2_ebgp.py
index f04279a08..530c49f6b 100644
--- a/tests/topotests/static_routing_with_ebgp/test_static_routes_topo2_ebgp.py
+++ b/tests/topotests/static_routing_with_ebgp/test_static_routes_topo2_ebgp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """
diff --git a/tests/topotests/static_routing_with_ebgp/test_static_routes_topo3_ebgp.py b/tests/topotests/static_routing_with_ebgp/test_static_routes_topo3_ebgp.py
index 088ac600c..358047607 100644
--- a/tests/topotests/static_routing_with_ebgp/test_static_routes_topo3_ebgp.py
+++ b/tests/topotests/static_routing_with_ebgp/test_static_routes_topo3_ebgp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
     -Verify static route ECMP functionality with 8 next hop
 
diff --git a/tests/topotests/static_routing_with_ebgp/test_static_routes_topo4_ebgp.py b/tests/topotests/static_routing_with_ebgp/test_static_routes_topo4_ebgp.py
index 3f49ced7c..c1099bd97 100644
--- a/tests/topotests/static_routing_with_ebgp/test_static_routes_topo4_ebgp.py
+++ b/tests/topotests/static_routing_with_ebgp/test_static_routes_topo4_ebgp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 
diff --git a/tests/topotests/static_routing_with_ibgp/test_static_routes_topo1_ibgp.py b/tests/topotests/static_routing_with_ibgp/test_static_routes_topo1_ibgp.py
index 6b7b2adfd..176ce7e48 100644
--- a/tests/topotests/static_routing_with_ibgp/test_static_routes_topo1_ibgp.py
+++ b/tests/topotests/static_routing_with_ibgp/test_static_routes_topo1_ibgp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
 
     -Verify static route ECMP functionality with 2 next hop
diff --git a/tests/topotests/static_routing_with_ibgp/test_static_routes_topo2_ibgp.py b/tests/topotests/static_routing_with_ibgp/test_static_routes_topo2_ibgp.py
index 350a117b9..20c68dc25 100644
--- a/tests/topotests/static_routing_with_ibgp/test_static_routes_topo2_ibgp.py
+++ b/tests/topotests/static_routing_with_ibgp/test_static_routes_topo2_ibgp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 
 """
diff --git a/tests/topotests/static_routing_with_ibgp/test_static_routes_topo3_ibgp.py b/tests/topotests/static_routing_with_ibgp/test_static_routes_topo3_ibgp.py
index cdd7e13f7..7f3592731 100644
--- a/tests/topotests/static_routing_with_ibgp/test_static_routes_topo3_ibgp.py
+++ b/tests/topotests/static_routing_with_ibgp/test_static_routes_topo3_ibgp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
     -Verify static route ECMP functionality with 8 next hop
 
diff --git a/tests/topotests/static_routing_with_ibgp/test_static_routes_topo4_ibgp.py b/tests/topotests/static_routing_with_ibgp/test_static_routes_topo4_ibgp.py
index d5e5148ea..e50362b57 100644
--- a/tests/topotests/static_routing_with_ibgp/test_static_routes_topo4_ibgp.py
+++ b/tests/topotests/static_routing_with_ibgp/test_static_routes_topo4_ibgp.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2020 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 
diff --git a/tests/topotests/tc_basic/test_tc_basic.py b/tests/topotests/tc_basic/test_tc_basic.py
index e98e11d71..f64e83c3c 100755
--- a/tests/topotests/tc_basic/test_tc_basic.py
+++ b/tests/topotests/tc_basic/test_tc_basic.py
@@ -1,24 +1,11 @@
 #!/usr/bin/python
+# SPDX-License-Identifier: ISC
 
 #
 # test_tc_basic.py
 #
 # Copyright (c) 2022 by Shichu Yang
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 """
 test_tc_basic.py: Test basic TC filters, classes and qdiscs.
 """
diff --git a/tests/topotests/zebra_multiple_connected/test_zebra_multiple_connected.py b/tests/topotests/zebra_multiple_connected/test_zebra_multiple_connected.py
index 8882cf5bd..529520cd9 100644
--- a/tests/topotests/zebra_multiple_connected/test_zebra_multiple_connected.py
+++ b/tests/topotests/zebra_multiple_connected/test_zebra_multiple_connected.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_zebra_multiple_connected.py
@@ -7,20 +8,6 @@
 # Nvidia Corporation
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_zebra_multiple_connected.py: Testing multiple connected
diff --git a/tests/topotests/zebra_netlink/test_zebra_netlink.py b/tests/topotests/zebra_netlink/test_zebra_netlink.py
index 6d7b99291..5a30f7927 100644
--- a/tests/topotests/zebra_netlink/test_zebra_netlink.py
+++ b/tests/topotests/zebra_netlink/test_zebra_netlink.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_zebra_netlink.py
 #
 # Copyright (c) 2020 by
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_zebra_netlink.py: Test some basic interactions with kernel using Netlink
diff --git a/tests/topotests/zebra_nht_resolution/test_verify_nh_resolution.py b/tests/topotests/zebra_nht_resolution/test_verify_nh_resolution.py
index 9a8f7cc1f..6956ab740 100644
--- a/tests/topotests/zebra_nht_resolution/test_verify_nh_resolution.py
+++ b/tests/topotests/zebra_nht_resolution/test_verify_nh_resolution.py
@@ -1,24 +1,11 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # Copyright (c) 2022 by VMware, Inc. ("VMware")
 # Used Copyright (c) 2018 by Network Device Education Foundation,
 # Inc. ("NetDEF") in this file.
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test is indended for validating zebra NH resolution logic
diff --git a/tests/topotests/zebra_opaque/test_zebra_opaque.py b/tests/topotests/zebra_opaque/test_zebra_opaque.py
index 202e28a17..25fbb9780 100644
--- a/tests/topotests/zebra_opaque/test_zebra_opaque.py
+++ b/tests/topotests/zebra_opaque/test_zebra_opaque.py
@@ -1,22 +1,9 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 # Copyright (c) 2021 by
 # Donatas Abraitis <donatas.abraitis@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 Test if Opaque Data is accessable from other daemons in Zebra
diff --git a/tests/topotests/zebra_rib/test_zebra_rib.py b/tests/topotests/zebra_rib/test_zebra_rib.py
index 2334a198d..6137471ea 100644
--- a/tests/topotests/zebra_rib/test_zebra_rib.py
+++ b/tests/topotests/zebra_rib/test_zebra_rib.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 #
 # test_zebra_rib.py
 #
@@ -6,20 +7,6 @@
 # Cumulus Networks, Inc
 # Donald Sharp
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_zebra_rib.py: Test some basic zebra <-> kernel interactions
diff --git a/tests/topotests/zebra_seg6_route/test_zebra_seg6_route.py b/tests/topotests/zebra_seg6_route/test_zebra_seg6_route.py
index 399af748a..1d01263d9 100755
--- a/tests/topotests/zebra_seg6_route/test_zebra_seg6_route.py
+++ b/tests/topotests/zebra_seg6_route/test_zebra_seg6_route.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_zebra_seg6_route.py
@@ -6,20 +7,6 @@
 # Copyright (c) 2020 by
 # LINE Corporation, Hiroki Shirokura <slank.dev@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_zebra_seg6_route.py: Test seg6 route addition with zapi.
diff --git a/tests/topotests/zebra_seg6local_route/test_zebra_seg6local_route.py b/tests/topotests/zebra_seg6local_route/test_zebra_seg6local_route.py
index 66d3b6d91..0dc87741a 100755
--- a/tests/topotests/zebra_seg6local_route/test_zebra_seg6local_route.py
+++ b/tests/topotests/zebra_seg6local_route/test_zebra_seg6local_route.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: ISC
 
 #
 # test_zebra_seg6local_route.py
@@ -6,20 +7,6 @@
 # Copyright (c) 2020 by
 # LINE Corporation, Hiroki Shirokura <slank.dev@gmail.com>
 #
-# Permission to use, copy, modify, and/or distribute this software
-# for any purpose with or without fee is hereby granted, provided
-# that the above copyright notice and this permission notice appear
-# in all copies.
-#
-# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
-# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
-# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-#
 
 """
 test_zebra_seg6local_route.py: Test seg6local route addition with zapi.
diff --git a/tests/zebra/test_lm_plugin.c b/tests/zebra/test_lm_plugin.c
index ecfb08579..9ad0bc4e1 100644
--- a/tests/zebra/test_lm_plugin.c
+++ b/tests/zebra/test_lm_plugin.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Label Manager tests.
  * Copyright (C) 2020 Volta Networks
  *                    Patrick Ruddy
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/tools/build-debian-package.sh b/tools/build-debian-package.sh
index 3c922c355..d614ba01d 100755
--- a/tools/build-debian-package.sh
+++ b/tools/build-debian-package.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+# SPDX-License-Identifier: NONE
 #
 # Written by Daniil Baturin, 2018
 # Rewritten by Ondřej Surý, 2020
diff --git a/tools/checkpatch.pl b/tools/checkpatch.pl
index db6460f34..b5892e8da 100755
--- a/tools/checkpatch.pl
+++ b/tools/checkpatch.pl
@@ -1,9 +1,9 @@
 #!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 # (c) 2001, Dave Jones. (the file handling bit)
 # (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
 # (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
 # (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
-# Licensed under the terms of the GNU GPL License version 2
 
 use strict;
 use warnings;
@@ -3627,7 +3627,9 @@ sub process {
 
 # no C99 // comments
 		if ($line =~ m{//}) {
-			if (!$allow_c99_comments) {
+			if ($rawlines[$linenr - 1] =~ /SPDX-License-Identifier:/) {
+				# ignore
+			} elsif (!$allow_c99_comments) {
 				if(ERROR("C99_COMMENTS",
 					 "do not use C99 // comments\n" . $herecurr) &&
 				   $fix) {
diff --git a/tools/fixup-deprecated.py b/tools/fixup-deprecated.py
index 57f9df906..ad3ae54ab 100755
--- a/tools/fixup-deprecated.py
+++ b/tools/fixup-deprecated.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
+# SPDX-License-Identifier: NONE
 #
 # Script used to replace deprecated quagga/frr mactors/types/etc.
 #
diff --git a/tools/frr-llvm-cg.c b/tools/frr-llvm-cg.c
index 8ce754fec..51e8fb7b7 100644
--- a/tools/frr-llvm-cg.c
+++ b/tools/frr-llvm-cg.c
@@ -1,28 +1,4 @@
-// This is free and unencumbered software released into the public domain.
-//
-// Anyone is free to copy, modify, publish, use, compile, sell, or
-// distribute this software, either in source code form or as a compiled
-// binary, for any purpose, commercial or non-commercial, and by any
-// means.
-//
-// In jurisdictions that recognize copyright laws, the author or authors
-// of this software dedicate any and all copyright interest in the
-// software to the public domain. We make this dedication for the benefit
-// of the public at large and to the detriment of our heirs and
-// successors. We intend this dedication to be an overt act of
-// relinquishment in perpetuity of all present and future rights to this
-// software under copyright law.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
-// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-// OTHER DEALINGS IN THE SOFTWARE.
-//
-// For more information, please refer to <http://unlicense.org/>
-
+// SPDX-License-Identifier: Unlicense
 /* based on example code: https://github.com/sheredom/llvm_bc_parsing_example
  * which came under the above (un-)license.  does not depend on any FRR
  * pieces, so no reason to change the license.
diff --git a/tools/frr-llvm-debuginfo.cpp b/tools/frr-llvm-debuginfo.cpp
index ed3ad956b..16ad18bed 100644
--- a/tools/frr-llvm-debuginfo.cpp
+++ b/tools/frr-llvm-debuginfo.cpp
@@ -1,27 +1,4 @@
-// This is free and unencumbered software released into the public domain.
-//
-// Anyone is free to copy, modify, publish, use, compile, sell, or
-// distribute this software, either in source code form or as a compiled
-// binary, for any purpose, commercial or non-commercial, and by any
-// means.
-//
-// In jurisdictions that recognize copyright laws, the author or authors
-// of this software dedicate any and all copyright interest in the
-// software to the public domain. We make this dedication for the benefit
-// of the public at large and to the detriment of our heirs and
-// successors. We intend this dedication to be an overt act of
-// relinquishment in perpetuity of all present and future rights to this
-// software under copyright law.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
-// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-// OTHER DEALINGS IN THE SOFTWARE.
-//
-// For more information, please refer to <http://unlicense.org/>
+// SPDX-License-Identifier: Unlicense
 
 #include <llvm-c/BitReader.h>
 #include <llvm-c/BitWriter.h>
diff --git a/tools/frr-llvm-debuginfo.h b/tools/frr-llvm-debuginfo.h
index fca4bc1f9..4d2985cf7 100644
--- a/tools/frr-llvm-debuginfo.h
+++ b/tools/frr-llvm-debuginfo.h
@@ -1,27 +1,4 @@
-// This is free and unencumbered software released into the public domain.
-//
-// Anyone is free to copy, modify, publish, use, compile, sell, or
-// distribute this software, either in source code form or as a compiled
-// binary, for any purpose, commercial or non-commercial, and by any
-// means.
-//
-// In jurisdictions that recognize copyright laws, the author or authors
-// of this software dedicate any and all copyright interest in the
-// software to the public domain. We make this dedication for the benefit
-// of the public at large and to the detriment of our heirs and
-// successors. We intend this dedication to be an overt act of
-// relinquishment in perpetuity of all present and future rights to this
-// software under copyright law.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
-// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-// OTHER DEALINGS IN THE SOFTWARE.
-//
-// For more information, please refer to <http://unlicense.org/>
+// SPDX-License-Identifier: Unlicense
 
 #ifndef _FRR_LLVM_DEBUGINFO_H
 #define _FRR_LLVM_DEBUGINFO_H
diff --git a/tools/frr-reload.py b/tools/frr-reload.py
index dfbc9b800..a69b0a7bf 100755
--- a/tools/frr-reload.py
+++ b/tools/frr-reload.py
@@ -1,24 +1,8 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
 # Frr Reloader
 # Copyright (C) 2014 Cumulus Networks, Inc.
 #
-# This file is part of Frr.
-#
-# Frr is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the
-# Free Software Foundation; either version 2, or (at your option) any
-# later version.
-#
-# Frr is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with Frr; see the file COPYING.  If not, write to the Free
-# Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-#  02111-1307, USA.
-#
 """
 This program
 - reads a frr configuration text file
diff --git a/tools/frr.vim b/tools/frr.vim
index 7cc248f4c..19ac3fc99 100644
--- a/tools/frr.vim
+++ b/tools/frr.vim
@@ -1,3 +1,4 @@
+" SPDX-License-Identifier: NONE
 " settings & syntax hilighting for FRR codebase
 " 2019 by David Lamparter, placed in public domain
 
diff --git a/tools/frr_babeltrace.py b/tools/frr_babeltrace.py
index 27d830a11..4d974ad35 100755
--- a/tools/frr_babeltrace.py
+++ b/tools/frr_babeltrace.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
 """
 Usage: frr_babeltrace.py trace_path
 
@@ -9,20 +10,6 @@ that pretty printing.
 
 Copyright (C) 2021  NVIDIA Corporation
 Anuradha Karuppiah
-
-This program is free software; you can redistribute it and/or modify it
-under the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2 of the License, or (at your option)
-any later version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT
-ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-more details.
-
-You should have received a copy of the GNU General Public License along
-with this program; see the file COPYING; if not, write to the Free Software
-Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 """
 
 import ipaddress
diff --git a/tools/gcc-plugins/frr-format.c b/tools/gcc-plugins/frr-format.c
index 0a24b091a..2240a171b 100644
--- a/tools/gcc-plugins/frr-format.c
+++ b/tools/gcc-plugins/frr-format.c
@@ -1,24 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
 /* Check calls to formatted I/O functions (-Wformat).
    Copyright (C) 1992-2019 Free Software Foundation, Inc.
 
    Extended for FRR's printfrr() with Linux kernel style extensions
    Copyright (C) 2019-2020  David Lamparter, for NetDEF, Inc.
-
-This file is part of GCC.
-
-GCC is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 3, or (at your option) any later
-version.
-
-GCC is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-for more details.
-
-You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING.GPLv3.  If not see
-<http://www.gnu.org/licenses/>.  */
+ */
 
 #include "gcc-common.h"
 
diff --git a/tools/gcc-plugins/frr-format.h b/tools/gcc-plugins/frr-format.h
index 599dbc56f..373ef0724 100644
--- a/tools/gcc-plugins/frr-format.h
+++ b/tools/gcc-plugins/frr-format.h
@@ -1,21 +1,7 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
 /* Check calls to formatted I/O functions (-Wformat).
    Copyright (C) 1992-2018 Free Software Foundation, Inc.
-
-This file is part of GCC.
-
-GCC is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 3, or (at your option) any later
-version.
-
-GCC is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-for more details.
-
-You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING3.  If not see
-<http://www.gnu.org/licenses/>.  */
+ */
 
 #ifndef GCC_C_FORMAT_H
 #define GCC_C_FORMAT_H
diff --git a/tools/gen_northbound_callbacks.c b/tools/gen_northbound_callbacks.c
index 1705a3203..5b778a158 100644
--- a/tools/gen_northbound_callbacks.c
+++ b/tools/gen_northbound_callbacks.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #define REALLY_NEED_PLAIN_GETOPT 1
diff --git a/tools/gen_yang_deviations.c b/tools/gen_yang_deviations.c
index 8aa5695d3..fc9f55bcb 100644
--- a/tools/gen_yang_deviations.c
+++ b/tools/gen_yang_deviations.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #define REALLY_NEED_PLAIN_GETOPT 1
diff --git a/tools/generate_support_bundle.py b/tools/generate_support_bundle.py
index 104d9714d..04a374d85 100755
--- a/tools/generate_support_bundle.py
+++ b/tools/generate_support_bundle.py
@@ -1,21 +1,8 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # Copyright (c) 2021, LabN Consulting, L.L.C.
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-#
 
 ########################################################
 ### Python Script to generate the FRR support bundle ###
diff --git a/tools/indent.py b/tools/indent.py
index 61a0fd445..fe9eb7c25 100755
--- a/tools/indent.py
+++ b/tools/indent.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
+# SPDX-License-Identifier: NONE
 # 2017 by David Lamparter, placed in public domain
 
 import sys, re, subprocess, os
diff --git a/tools/nhrpd-event-handler.sh b/tools/nhrpd-event-handler.sh
index 5dce43fe8..e7eaf46f6 100755
--- a/tools/nhrpd-event-handler.sh
+++ b/tools/nhrpd-event-handler.sh
@@ -1,22 +1,9 @@
 #!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # Author: Joe Maimon
 # Released to public domain
 #
-# This program is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-# more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; see the file COPYING; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-#
 
 PROGNAME=`basename $0`
 VERSION="0.0.6"
diff --git a/tools/permutations.c b/tools/permutations.c
index a0b041f2f..f3883b107 100644
--- a/tools/permutations.c
+++ b/tools/permutations.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Generates all possible matching inputs for a command string.
  * --
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/tools/render_md.py b/tools/render_md.py
index 7636496b6..80e26f341 100644
--- a/tools/render_md.py
+++ b/tools/render_md.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: NONE
 # written 2016 by David Lamparter, placed in Public Domain.
 import sys, markdown
 
diff --git a/tools/start-stop-daemon.c b/tools/start-stop-daemon.c
index e196a372e..9f566bd1e 100644
--- a/tools/start-stop-daemon.c
+++ b/tools/start-stop-daemon.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: NONE
 /*
  * A rewrite of the original Debian's start-stop-daemon Perl script
  * in C (faster - it is executed many times during system startup).
diff --git a/tools/stringmangle.py b/tools/stringmangle.py
index 1c75c86a0..29fcb86ea 100644
--- a/tools/stringmangle.py
+++ b/tools/stringmangle.py
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: NONE
 # 2020 by David Lamparter, placed in the public domain.
 
 import sys
diff --git a/tools/symalyzer.html b/tools/symalyzer.html
index eefeee3b0..b136ce590 100644
--- a/tools/symalyzer.html
+++ b/tools/symalyzer.html
@@ -1,5 +1,6 @@
 <html>
 <!--
+  - SPDX-License-Identifier: NONE
   - 2019 by David Lamparter, placed in public domain
   -->
   <head>
diff --git a/tools/symalyzer.py b/tools/symalyzer.py
index ce0bfde0a..7d37a1a31 100755
--- a/tools/symalyzer.py
+++ b/tools/symalyzer.py
@@ -1,4 +1,5 @@
 #!/usr/bin/python3
+# SPDX-License-Identifier: NONE
 #
 # 2019 by David Lamparter, placed in public domain
 #
diff --git a/tools/zc.pl b/tools/zc.pl
index 5307fa387..77af50085 100755
--- a/tools/zc.pl
+++ b/tools/zc.pl
@@ -1,24 +1,8 @@
 #!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 ##
 ## Zebra interactive console
 ## Copyright (C) 2000 Vladimir B. Grebenschikov <vova@express.ru>
-##
-## This file is part of GNU Zebra.
-##
-## GNU Zebra is free software; you can redistribute it and/or modify it
-## under the terms of the GNU General Public License as published by the
-## Free Software Foundation; either version 2, or (at your option) any
-## later version.
-##
-## GNU Zebra is distributed in the hope that it will be useful, but
-## WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-## General Public License for more details.
-##
-## You should have received a copy of the GNU General Public License
-## along with GNU Zebra; see the file COPYING.  If not, write to the
-## Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-## Boston, MA 02111-1307, USA.
 
 use Net::Telnet ();
 use Getopt::Std;
diff --git a/vrrpd/vrrp.c b/vrrpd/vrrp.c
index c3ab1abbd..5bb1d6911 100644
--- a/vrrpd/vrrp.c
+++ b/vrrpd/vrrp.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP global definitions and state machine.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/vrrpd/vrrp.h b/vrrpd/vrrp.h
index b3141ef31..9da9c8a51 100644
--- a/vrrpd/vrrp.h
+++ b/vrrpd/vrrp.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP global definitions and state machine.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __VRRP_H__
 #define __VRRP_H__
diff --git a/vrrpd/vrrp_arp.c b/vrrpd/vrrp_arp.c
index 749b59cc4..007205379 100644
--- a/vrrpd/vrrp_arp.c
+++ b/vrrpd/vrrp_arp.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP ARP handling.
  * Copyright (C) 2001-2017 Alexandre Cassen
  * Portions:
  *     Copyright (C) 2018-2019 Cumulus Networks, Inc.
  *     Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/vrrpd/vrrp_arp.h b/vrrpd/vrrp_arp.h
index 21f2c4edd..46aa128ce 100644
--- a/vrrpd/vrrp_arp.h
+++ b/vrrpd/vrrp_arp.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP ARP handling.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __VRRP_ARP_H__
 #define __VRRP_ARP_H__
diff --git a/vrrpd/vrrp_debug.c b/vrrpd/vrrp_debug.c
index 09d5e780c..a772b3b5c 100644
--- a/vrrpd/vrrp_debug.c
+++ b/vrrpd/vrrp_debug.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP debugging.
  * Copyright (C) 2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/vrrpd/vrrp_debug.h b/vrrpd/vrrp_debug.h
index 459d4d01a..c1421ebba 100644
--- a/vrrpd/vrrp_debug.h
+++ b/vrrpd/vrrp_debug.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP debugging.
  * Copyright (C) 2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __VRRP_DEBUG_H__
 #define __VRRP_DEBUG_H__
diff --git a/vrrpd/vrrp_main.c b/vrrpd/vrrp_main.c
index 59769788e..d3d230d20 100644
--- a/vrrpd/vrrp_main.c
+++ b/vrrpd/vrrp_main.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP entry point.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/vrrpd/vrrp_ndisc.c b/vrrpd/vrrp_ndisc.c
index b989e66f6..038d29322 100644
--- a/vrrpd/vrrp_ndisc.c
+++ b/vrrpd/vrrp_ndisc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP Neighbor Discovery.
  * Copyright (C) 2019 Cumulus Networks, Inc.
@@ -5,20 +6,6 @@
  *
  * Portions:
  *     Copyright (C) 2001-2017 Alexandre Cassen
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/vrrpd/vrrp_ndisc.h b/vrrpd/vrrp_ndisc.h
index efbef348d..15fa71941 100644
--- a/vrrpd/vrrp_ndisc.h
+++ b/vrrpd/vrrp_ndisc.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP Neighbor Discovery.
  * Copyright (C) 2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __VRRP_NDISC_H__
 #define __VRRP_NDISC_H__
diff --git a/vrrpd/vrrp_northbound.c b/vrrpd/vrrp_northbound.c
index 76d0ad3b1..1f8da4cf2 100644
--- a/vrrpd/vrrp_northbound.c
+++ b/vrrpd/vrrp_northbound.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP northbound bindings.
  * Copyright (C) 2019  Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/vrrpd/vrrp_packet.c b/vrrpd/vrrp_packet.c
index 96a19da88..36494c7df 100644
--- a/vrrpd/vrrp_packet.c
+++ b/vrrpd/vrrp_packet.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP packet crafting.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 #include <netinet/in.h>
diff --git a/vrrpd/vrrp_packet.h b/vrrpd/vrrp_packet.h
index eec709593..99136dace 100644
--- a/vrrpd/vrrp_packet.h
+++ b/vrrpd/vrrp_packet.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP packet crafting.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __VRRP_PACKET_H__
 #define __VRRP_PACKET_H__
diff --git a/vrrpd/vrrp_vty.c b/vrrpd/vrrp_vty.c
index 1e1edb821..7a17de747 100644
--- a/vrrpd/vrrp_vty.c
+++ b/vrrpd/vrrp_vty.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP CLI commands.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/vrrpd/vrrp_vty.h b/vrrpd/vrrp_vty.h
index be88349e7..6feb8e8ec 100644
--- a/vrrpd/vrrp_vty.h
+++ b/vrrpd/vrrp_vty.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP CLI commands.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __VRRP_VTY_H__
 #define __VRRP_VTY_H__
diff --git a/vrrpd/vrrp_zebra.c b/vrrpd/vrrp_zebra.c
index 4cea8ebe4..6d753d2e4 100644
--- a/vrrpd/vrrp_zebra.c
+++ b/vrrpd/vrrp_zebra.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP Zebra interfacing.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/vrrpd/vrrp_zebra.h b/vrrpd/vrrp_zebra.h
index c09943dce..5e59256e1 100644
--- a/vrrpd/vrrp_zebra.h
+++ b/vrrpd/vrrp_zebra.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * VRRP Zebra interfacing.
  * Copyright (C) 2018-2019 Cumulus Networks, Inc.
  * Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #ifndef __VRRP_ZEBRA_H__
 #define __VRRP_ZEBRA_H__
diff --git a/vtysh/daemons.pl b/vtysh/daemons.pl
index fc9517340..c75bae0c1 100755
--- a/vtysh/daemons.pl
+++ b/vtysh/daemons.pl
@@ -1,26 +1,9 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 ##
 ## generate daemons list and help strings
 ##
 ## Copyright (C) 2020 NFWare Inc.
-##
-## This file is part of FRR.
-##
-## FRR is free software; you can redistribute it and/or modify it
-## under the terms of the GNU General Public License as published by the
-## Free Software Foundation; either version 2, or (at your option) any
-## later version.
-##
-## FRR is distributed in the hope that it will be useful, but
-## WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-## General Public License for more details.
-##
-## You should have received a copy of the GNU General Public License
-## along with FRR; see the file COPYING; if not, write to the Free
-## Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
-## 02110-1301, USA.
-##
 
 use strict;
 
diff --git a/vtysh/vtysh.c b/vtysh/vtysh.c
index 2538d2073..a17ee812e 100644
--- a/vtysh/vtysh.c
+++ b/vtysh/vtysh.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Virtual terminal interface shell.
  * Copyright (C) 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/vtysh/vtysh.h b/vtysh/vtysh.h
index 5e050bde9..538837391 100644
--- a/vtysh/vtysh.h
+++ b/vtysh/vtysh.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Virtual terminal interface shell.
  * Copyright (C) 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef VTYSH_H
diff --git a/vtysh/vtysh_config.c b/vtysh/vtysh_config.c
index 6dce99a57..905761a01 100644
--- a/vtysh/vtysh_config.c
+++ b/vtysh/vtysh_config.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Configuration generator.
  * Copyright (C) 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/vtysh/vtysh_main.c b/vtysh/vtysh_main.c
index be7eb3ecd..25b667252 100644
--- a/vtysh/vtysh_main.c
+++ b/vtysh/vtysh_main.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Virtual terminal interface shell.
  * Copyright (C) 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/vtysh/vtysh_user.c b/vtysh/vtysh_user.c
index 1ed284809..a0667acc7 100644
--- a/vtysh/vtysh_user.c
+++ b/vtysh/vtysh_user.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* User authentication for vtysh.
  * Copyright (C) 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/vtysh/vtysh_user.h b/vtysh/vtysh_user.h
index 2b31589f2..322a3b263 100644
--- a/vtysh/vtysh_user.h
+++ b/vtysh/vtysh_user.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* User authentication for vtysh.
  * Copyright (C) 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _VTYSH_USER_H
diff --git a/watchfrr/watchfrr.c b/watchfrr/watchfrr.c
index c37626ccc..84f4d02a8 100644
--- a/watchfrr/watchfrr.c
+++ b/watchfrr/watchfrr.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Monitor status of frr daemons and restart if necessary.
  *
  * Copyright (C) 2004  Andrew J. Schorr
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/watchfrr/watchfrr.h b/watchfrr/watchfrr.h
index 4987a932c..ed915fedb 100644
--- a/watchfrr/watchfrr.h
+++ b/watchfrr/watchfrr.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Common definitions for watchfrr API socket.
  *
  * Copyright (C) 2016  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef FRR_WATCHFRR_H
diff --git a/watchfrr/watchfrr_errors.c b/watchfrr/watchfrr_errors.c
index 0aa27ef66..e79265dfa 100644
--- a/watchfrr/watchfrr_errors.c
+++ b/watchfrr/watchfrr_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Watchfrr-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/watchfrr/watchfrr_errors.h b/watchfrr/watchfrr_errors.h
index 9d5abde52..bf9ce7867 100644
--- a/watchfrr/watchfrr_errors.h
+++ b/watchfrr/watchfrr_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Watchfrr-specific error messages.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *               Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __WATCHFRR_ERRORS_H__
diff --git a/watchfrr/watchfrr_vty.c b/watchfrr/watchfrr_vty.c
index 742b474ea..3afc76761 100644
--- a/watchfrr/watchfrr_vty.c
+++ b/watchfrr/watchfrr_vty.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * watchfrr CLI functions.
  *
  * Copyright (C) 2016  David Lamparter for NetDEF, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/yang/LICENSE b/yang/LICENSE
deleted file mode 100644
index a7cec5de9..000000000
--- a/yang/LICENSE
+++ /dev/null
@@ -1,22 +0,0 @@
-Copyright 2020 FRRouting
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-1. Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
-
-2. Redistributions in binary form must reproduce the above copyright notice,
-this list of conditions and the following disclaimer in the documentation
-and/or other materials provided with the distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
-USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/yang/embedmodel.py b/yang/embedmodel.py
index c532973d7..6d37839cf 100644
--- a/yang/embedmodel.py
+++ b/yang/embedmodel.py
@@ -1,4 +1,5 @@
 #!/usr/bin/python3
+# SPDX-License-Identifier: NONE
 #
 # YANG module to C wrapper
 # written 2018 by David Lamparter, placed in Public Domain.
diff --git a/yang/frr-bfdd.yang b/yang/frr-bfdd.yang
index d3e756e0b..ffba42b53 100644
--- a/yang/frr-bfdd.yang
+++ b/yang/frr-bfdd.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-bfdd {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/bfdd";
diff --git a/yang/frr-bgp-bmp.yang b/yang/frr-bgp-bmp.yang
index 8c3de839b..d6196d68b 100644
--- a/yang/frr-bgp-bmp.yang
+++ b/yang/frr-bgp-bmp.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 submodule frr-bgp-bmp {
   yang-version 1.1;
 
diff --git a/yang/frr-bgp-common-multiprotocol.yang b/yang/frr-bgp-common-multiprotocol.yang
index 4b080613d..c22bdf996 100644
--- a/yang/frr-bgp-common-multiprotocol.yang
+++ b/yang/frr-bgp-common-multiprotocol.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 submodule frr-bgp-common-multiprotocol {
   yang-version 1.1;
 
diff --git a/yang/frr-bgp-common-structure.yang b/yang/frr-bgp-common-structure.yang
index 4c12b956c..81683e899 100644
--- a/yang/frr-bgp-common-structure.yang
+++ b/yang/frr-bgp-common-structure.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 submodule frr-bgp-common-structure {
   yang-version 1.1;
 
diff --git a/yang/frr-bgp-neighbor.yang b/yang/frr-bgp-neighbor.yang
index 6d7358066..5a4c37974 100644
--- a/yang/frr-bgp-neighbor.yang
+++ b/yang/frr-bgp-neighbor.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 submodule frr-bgp-neighbor {
   yang-version 1.1;
 
diff --git a/yang/frr-bgp-peer-group.yang b/yang/frr-bgp-peer-group.yang
index 15c31bf01..34214b7db 100644
--- a/yang/frr-bgp-peer-group.yang
+++ b/yang/frr-bgp-peer-group.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 submodule frr-bgp-peer-group {
   yang-version 1.1;
 
diff --git a/yang/frr-bgp-rpki.yang b/yang/frr-bgp-rpki.yang
index e9b6752f2..7e75580eb 100644
--- a/yang/frr-bgp-rpki.yang
+++ b/yang/frr-bgp-rpki.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-bgp-rpki {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/frr-bgp-rpki";
diff --git a/yang/frr-bgp-types.yang b/yang/frr-bgp-types.yang
index 55834df2e..722957293 100644
--- a/yang/frr-bgp-types.yang
+++ b/yang/frr-bgp-types.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-bgp-types {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/bgp-types";
diff --git a/yang/frr-bgp.yang b/yang/frr-bgp.yang
index 0e15195dd..b34fd43e7 100644
--- a/yang/frr-bgp.yang
+++ b/yang/frr-bgp.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-bgp {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/bgp";
diff --git a/yang/frr-deviations-bgp-datacenter.yang b/yang/frr-deviations-bgp-datacenter.yang
index 9d2725b25..46092cb24 100644
--- a/yang/frr-deviations-bgp-datacenter.yang
+++ b/yang/frr-deviations-bgp-datacenter.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-deviations-bgp-datacenter {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/frr-deviations-bgp-datacenter";
diff --git a/yang/frr-eigrpd.yang b/yang/frr-eigrpd.yang
index 2127ac498..e9071c897 100644
--- a/yang/frr-eigrpd.yang
+++ b/yang/frr-eigrpd.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-eigrpd {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/eigrpd";
diff --git a/yang/frr-filter.yang b/yang/frr-filter.yang
index 46a9100ab..a1946d834 100644
--- a/yang/frr-filter.yang
+++ b/yang/frr-filter.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-filter {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/filter";
diff --git a/yang/frr-gmp.yang b/yang/frr-gmp.yang
index 298b2aafd..a18651db2 100644
--- a/yang/frr-gmp.yang
+++ b/yang/frr-gmp.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-gmp {
   yang-version "1.1";
   namespace "http://frrouting.org/yang/gmp";
diff --git a/yang/frr-interface.yang b/yang/frr-interface.yang
index 4a152aadd..012c96b60 100644
--- a/yang/frr-interface.yang
+++ b/yang/frr-interface.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-interface {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/interface";
diff --git a/yang/frr-isisd.yang b/yang/frr-isisd.yang
index 5483410d0..fd8a0de4e 100644
--- a/yang/frr-isisd.yang
+++ b/yang/frr-isisd.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-isisd {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/isisd";
diff --git a/yang/frr-module-translator.yang b/yang/frr-module-translator.yang
index 90d3cc860..668bb2160 100644
--- a/yang/frr-module-translator.yang
+++ b/yang/frr-module-translator.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-module-translator {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/frr-module-translator";
diff --git a/yang/frr-nexthop.yang b/yang/frr-nexthop.yang
index adcbacbfe..d73fdb8bd 100644
--- a/yang/frr-nexthop.yang
+++ b/yang/frr-nexthop.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-nexthop {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/nexthop";
diff --git a/yang/frr-pim-rp.yang b/yang/frr-pim-rp.yang
index 33b453b29..4cc214135 100644
--- a/yang/frr-pim-rp.yang
+++ b/yang/frr-pim-rp.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-pim-rp {
   yang-version "1.1";
   namespace "http://frrouting.org/yang/pim-rp";
diff --git a/yang/frr-pim.yang b/yang/frr-pim.yang
index 9e40d7860..105dab895 100644
--- a/yang/frr-pim.yang
+++ b/yang/frr-pim.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-pim {
   yang-version "1.1";
   namespace "http://frrouting.org/yang/pim";
diff --git a/yang/frr-ripd.yang b/yang/frr-ripd.yang
index d77241cb1..746bf35d2 100644
--- a/yang/frr-ripd.yang
+++ b/yang/frr-ripd.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-ripd {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/ripd";
diff --git a/yang/frr-ripngd.yang b/yang/frr-ripngd.yang
index 07d38bd41..d7de4c398 100644
--- a/yang/frr-ripngd.yang
+++ b/yang/frr-ripngd.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-ripngd {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/ripngd";
diff --git a/yang/frr-route-map.yang b/yang/frr-route-map.yang
index 1e8c04bc6..224b2caef 100644
--- a/yang/frr-route-map.yang
+++ b/yang/frr-route-map.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-route-map {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/route-map";
diff --git a/yang/frr-route-types.yang b/yang/frr-route-types.yang
index ffc671c99..728607cab 100644
--- a/yang/frr-route-types.yang
+++ b/yang/frr-route-types.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-route-types {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/route-types";
diff --git a/yang/frr-routing.yang b/yang/frr-routing.yang
index 6a721b292..b304c241a 100644
--- a/yang/frr-routing.yang
+++ b/yang/frr-routing.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-routing {
   yang-version "1.1";
   namespace "http://frrouting.org/yang/routing";
diff --git a/yang/frr-staticd.yang b/yang/frr-staticd.yang
index cb5e25b87..1e6c54c00 100644
--- a/yang/frr-staticd.yang
+++ b/yang/frr-staticd.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-staticd {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/staticd";
diff --git a/yang/frr-test-module.yang b/yang/frr-test-module.yang
index 2f89ebca8..d6e718824 100644
--- a/yang/frr-test-module.yang
+++ b/yang/frr-test-module.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-test-module {
   yang-version 1.1;
   namespace "urn:frr-test-module";
diff --git a/yang/frr-vrf.yang b/yang/frr-vrf.yang
index bb17bfadd..39123b72d 100644
--- a/yang/frr-vrf.yang
+++ b/yang/frr-vrf.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-vrf {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/vrf";
diff --git a/yang/frr-vrrpd.yang b/yang/frr-vrrpd.yang
index cd04df267..ad9f13935 100644
--- a/yang/frr-vrrpd.yang
+++ b/yang/frr-vrrpd.yang
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause
 module frr-vrrpd {
   yang-version 1.1;
   namespace "http://frrouting.org/yang/vrrpd";
diff --git a/yang/libyang_plugins/frr_user_types.c b/yang/libyang_plugins/frr_user_types.c
index 48cdceccf..70a8da39c 100644
--- a/yang/libyang_plugins/frr_user_types.c
+++ b/yang/libyang_plugins/frr_user_types.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2018  NetDEF, Inc.
  *                     Renato Westphal
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/connected.c b/zebra/connected.c
index 9c207acf3..ee0823f56 100644
--- a/zebra/connected.c
+++ b/zebra/connected.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Address linked list routine.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/connected.h b/zebra/connected.h
index 3ed9f6d5b..4d714eaf5 100644
--- a/zebra/connected.h
+++ b/zebra/connected.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Interface's address and mask.
  * Copyright (C) 1997 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_CONNECTED_H
diff --git a/zebra/debug.c b/zebra/debug.c
index 977af0e19..68bedaf05 100644
--- a/zebra/debug.c
+++ b/zebra/debug.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra debug related function
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/debug.h b/zebra/debug.h
index 514827707..075d903c6 100644
--- a/zebra/debug.h
+++ b/zebra/debug.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra debug related function
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_DEBUG_H
diff --git a/zebra/debug_nl.c b/zebra/debug_nl.c
index afefab667..df0b5aae7 100644
--- a/zebra/debug_nl.c
+++ b/zebra/debug_nl.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: ISC
 /*
  * Copyright (c) 2018 Rafael Zalamena
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 #include <zebra.h>
diff --git a/zebra/dpdk/zebra_dplane_dpdk.c b/zebra/dpdk/zebra_dplane_dpdk.c
index 11a1af86c..87245f47e 100644
--- a/zebra/dpdk/zebra_dplane_dpdk.c
+++ b/zebra/dpdk/zebra_dplane_dpdk.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra dataplane plugin for DPDK based hw offload
  *
  * Copyright (C) 2021 Nvidia
  * Anuradha Karuppiah
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/zebra/dpdk/zebra_dplane_dpdk.h b/zebra/dpdk/zebra_dplane_dpdk.h
index 40f9263ca..e5a3dbeba 100644
--- a/zebra/dpdk/zebra_dplane_dpdk.h
+++ b/zebra/dpdk/zebra_dplane_dpdk.h
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra dataplane plugin for DPDK based hw offload
  *
  * Copyright (C) 2021 Nvidia
  * Anuradha Karuppiah
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_DPLANE_DPDK_H
diff --git a/zebra/dpdk/zebra_dplane_dpdk_private.h b/zebra/dpdk/zebra_dplane_dpdk_private.h
index b8483f491..e10f5258e 100644
--- a/zebra/dpdk/zebra_dplane_dpdk_private.h
+++ b/zebra/dpdk/zebra_dplane_dpdk_private.h
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra dataplane plugin for DPDK based hw offload
  *
  * Copyright (C) 2021 Nvidia
  * Anuradha Karuppiah
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_DPLANE_DPDK_PRIVATE_H
diff --git a/zebra/dpdk/zebra_dplane_dpdk_vty.c b/zebra/dpdk/zebra_dplane_dpdk_vty.c
index d1814af3b..45334a7c9 100644
--- a/zebra/dpdk/zebra_dplane_dpdk_vty.c
+++ b/zebra/dpdk/zebra_dplane_dpdk_vty.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra dataplane plugin for DPDK based hw offload
  *
  * Copyright (C) 2021 Nvidia
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/zebra/dplane_fpm_nl.c b/zebra/dplane_fpm_nl.c
index 6a0f02bab..18aed7b37 100644
--- a/zebra/dplane_fpm_nl.c
+++ b/zebra/dplane_fpm_nl.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra dataplane plugin for Forwarding Plane Manager (FPM) using netlink.
  *
  * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
  *                    Rafael Zalamena
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/zebra/if_ioctl.c b/zebra/if_ioctl.c
index e02f3d562..b3cf86512 100644
--- a/zebra/if_ioctl.c
+++ b/zebra/if_ioctl.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Interface looking up by ioctl ().
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/if_netlink.c b/zebra/if_netlink.c
index 823785ce1..21cad0137 100644
--- a/zebra/if_netlink.c
+++ b/zebra/if_netlink.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Interface looking up by netlink.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/if_netlink.h b/zebra/if_netlink.h
index f21596865..ede622418 100644
--- a/zebra/if_netlink.h
+++ b/zebra/if_netlink.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Header file exported by if_netlink.c to zebra.
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_IF_NETLINK_H
diff --git a/zebra/if_socket.c b/zebra/if_socket.c
index da9fadf7c..1172f8b10 100644
--- a/zebra/if_socket.c
+++ b/zebra/if_socket.c
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Interface interaction with the kernel using socket.
  * Copyright (C) 2022  NVIDIA CORPORATION & AFFILIATES
  *                     Stephen Worley
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/zebra/if_sysctl.c b/zebra/if_sysctl.c
index 70d11646c..ae292689e 100644
--- a/zebra/if_sysctl.c
+++ b/zebra/if_sysctl.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Get interface's address and mask information by sysctl() function.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/interface.c b/zebra/interface.c
index 5c60d355c..1ba5e972f 100644
--- a/zebra/interface.c
+++ b/zebra/interface.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Interface function.
  * Copyright (C) 1997, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/interface.h b/zebra/interface.h
index 7e5299000..c8ae906c9 100644
--- a/zebra/interface.h
+++ b/zebra/interface.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 /* Interface function header.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_INTERFACE_H
diff --git a/zebra/ioctl.c b/zebra/ioctl.c
index 631140025..8da1ae37c 100644
--- a/zebra/ioctl.c
+++ b/zebra/ioctl.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Common ioctl functions.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/ioctl.h b/zebra/ioctl.h
index debe5ba1c..8a97cbcd6 100644
--- a/zebra/ioctl.h
+++ b/zebra/ioctl.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Common ioctl functions.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_IOCTL_H
diff --git a/zebra/ipforward.h b/zebra/ipforward.h
index 9884678c7..e56e04280 100644
--- a/zebra/ipforward.h
+++ b/zebra/ipforward.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* IP forward settings.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_IPFORWARD_H
diff --git a/zebra/ipforward_proc.c b/zebra/ipforward_proc.c
index 4bd160ddb..08fbfede4 100644
--- a/zebra/ipforward_proc.c
+++ b/zebra/ipforward_proc.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Fetch ipforward value by reading /proc filesystem.
  * Copyright (C) 1997 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/ipforward_sysctl.c b/zebra/ipforward_sysctl.c
index 0015018f9..bc9d12b52 100644
--- a/zebra/ipforward_sysctl.c
+++ b/zebra/ipforward_sysctl.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* IP forward control by sysctl function.
  * Copyright (C) 1997, 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/irdp.h b/zebra/irdp.h
index 19f549cc5..9b97bb93f 100644
--- a/zebra/irdp.h
+++ b/zebra/irdp.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* ICMP Router Discovery Messages
  * Copyright (C) 1997, 2000 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/zebra/irdp_interface.c b/zebra/irdp_interface.c
index 36852b65b..0c9b6f3d3 100644
--- a/zebra/irdp_interface.c
+++ b/zebra/irdp_interface.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright (C) 1997, 2000
@@ -8,22 +9,6 @@
  *
  * Thanks to Jens Laas at Swedish University of Agricultural Sciences
  * for reviewing and tests.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/irdp_main.c b/zebra/irdp_main.c
index 65aad49a2..ddcad92bd 100644
--- a/zebra/irdp_main.c
+++ b/zebra/irdp_main.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright (C) 2000  Robert Olsson.
  * Swedish University of Agricultural Sciences
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/zebra/irdp_packet.c b/zebra/irdp_packet.c
index c27d97ba7..4f4f3772d 100644
--- a/zebra/irdp_packet.c
+++ b/zebra/irdp_packet.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  * Copyright (C) 2000  Robert Olsson.
  * Swedish University of Agricultural Sciences
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/zebra/kernel_netlink.c b/zebra/kernel_netlink.c
index fac6acae0..a980b56b3 100644
--- a/zebra/kernel_netlink.c
+++ b/zebra/kernel_netlink.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Kernel communication using netlink interface.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/kernel_netlink.h b/zebra/kernel_netlink.h
index 7d5453d54..446c86032 100644
--- a/zebra/kernel_netlink.h
+++ b/zebra/kernel_netlink.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Declarations and definitions for kernel interaction over netlink
  * Copyright (C) 2016 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_KERNEL_NETLINK_H
diff --git a/zebra/kernel_socket.c b/zebra/kernel_socket.c
index 332b8fc67..915fd087f 100644
--- a/zebra/kernel_socket.c
+++ b/zebra/kernel_socket.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Kernel communication using routing socket.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/kernel_socket.h b/zebra/kernel_socket.h
index 15079d796..0d29abd92 100644
--- a/zebra/kernel_socket.h
+++ b/zebra/kernel_socket.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Exported kernel_socket functions, exported only for convenience of
  * sysctl methods.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __ZEBRA_KERNEL_SOCKET_H
diff --git a/zebra/label_manager.c b/zebra/label_manager.c
index 2634a333e..c77470a70 100644
--- a/zebra/label_manager.c
+++ b/zebra/label_manager.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Label Manager for FRR
  *
@@ -5,20 +6,6 @@
  *                       Volta Networks Inc.
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/label_manager.h b/zebra/label_manager.h
index 8636c7921..c0bd8e369 100644
--- a/zebra/label_manager.h
+++ b/zebra/label_manager.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Label Manager header
  *
@@ -5,20 +6,6 @@
  *                       Volta Networks Inc.
  *
  * This file is part of FRRouting (FRR)
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _LABEL_MANAGER_H
diff --git a/zebra/main.c b/zebra/main.c
index e38f20371..c40a03551 100644
--- a/zebra/main.c
+++ b/zebra/main.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra daemon main routine.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/netconf_netlink.c b/zebra/netconf_netlink.c
index 4c30544e5..7352dfb2e 100644
--- a/zebra/netconf_netlink.c
+++ b/zebra/netconf_netlink.c
@@ -1,25 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * netconf_netlink.c - netconf interaction with the kernel using
  * netlink
  * Copyright (C) 2021  Nvidia, Inc.
  *                     Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #include <zebra.h>
 
diff --git a/zebra/netconf_netlink.h b/zebra/netconf_netlink.h
index 1b3450bcb..3abc72e2f 100644
--- a/zebra/netconf_netlink.h
+++ b/zebra/netconf_netlink.h
@@ -1,25 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * netconf_netlink.h - netconf interaction with the kernel using
  * netlink
  * Copyright (C) 2021  Nvidia, Inc.
  *                     Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #ifndef __NETCONF_NETLINK_H__
 #define __NETCONF_NETLINK_H__
diff --git a/zebra/redistribute.c b/zebra/redistribute.c
index 32d28f800..8cdc419cc 100644
--- a/zebra/redistribute.c
+++ b/zebra/redistribute.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Redistribution Handler
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/redistribute.h b/zebra/redistribute.h
index ac257d638..4347454eb 100644
--- a/zebra/redistribute.h
+++ b/zebra/redistribute.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Redistribution Handler
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_REDISTRIBUTE_H
diff --git a/zebra/rib.h b/zebra/rib.h
index 8a3b3e657..53ae63354 100644
--- a/zebra/rib.h
+++ b/zebra/rib.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Routing Information Base header
  * Copyright (C) 1997 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RIB_H
diff --git a/zebra/router-id.c b/zebra/router-id.c
index ea429f683..e8cb33c35 100644
--- a/zebra/router-id.c
+++ b/zebra/router-id.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Router ID for zebra daemon.
  *
  * Copyright (C) 2004 James R. Leu
  *
  * This file is part of Quagga routing suite.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/router-id.h b/zebra/router-id.h
index 4a35f6605..45860d8b7 100644
--- a/zebra/router-id.h
+++ b/zebra/router-id.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Router ID for zebra daemon.
  *
  * Copyright (C) 2004 James R. Leu
  *
  * This file is part of Quagga routing suite.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ROUTER_ID_H_
diff --git a/zebra/rt.h b/zebra/rt.h
index 4ebf47975..2e3495a03 100644
--- a/zebra/rt.h
+++ b/zebra/rt.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * kernel routing table update prototype.
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RT_H
diff --git a/zebra/rt_netlink.c b/zebra/rt_netlink.c
index 8bf59e02c..900c6520d 100644
--- a/zebra/rt_netlink.c
+++ b/zebra/rt_netlink.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Kernel routing table updates using netlink over GNU/Linux system.
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/rt_netlink.h b/zebra/rt_netlink.h
index b550cc06b..3ca59ce67 100644
--- a/zebra/rt_netlink.h
+++ b/zebra/rt_netlink.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Header file exported by rt_netlink.c to zebra.
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RT_NETLINK_H
diff --git a/zebra/rt_socket.c b/zebra/rt_socket.c
index 1f3f66a68..f9888b12d 100644
--- a/zebra/rt_socket.c
+++ b/zebra/rt_socket.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Kernel routing table updates by routing socket.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/rtadv.c b/zebra/rtadv.c
index 2b9246515..1e0769fb6 100644
--- a/zebra/rtadv.c
+++ b/zebra/rtadv.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Router advertisement
  * Copyright (C) 2016 Cumulus Networks
  * Copyright (C) 2005 6WIND <jean-mickael.guerin@6wind.com>
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/rtadv.h b/zebra/rtadv.h
index 2304af19d..2338efe0b 100644
--- a/zebra/rtadv.h
+++ b/zebra/rtadv.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Router advertisement
  * Copyright (C) 2005 6WIND <jean-mickael.guerin@6wind.com>
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RTADV_H
diff --git a/zebra/rtread_netlink.c b/zebra/rtread_netlink.c
index f9d460556..39daed283 100644
--- a/zebra/rtread_netlink.c
+++ b/zebra/rtread_netlink.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Kernel routing table readup by netlink
  * Copyright (C) 1998 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/rtread_sysctl.c b/zebra/rtread_sysctl.c
index f5b918c02..ef1e21b4f 100644
--- a/zebra/rtread_sysctl.c
+++ b/zebra/rtread_sysctl.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Kernel routing table read by sysctl function.
  * Copyright (C) 1997, 98 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/rule_netlink.c b/zebra/rule_netlink.c
index 135f06542..c7832992e 100644
--- a/zebra/rule_netlink.c
+++ b/zebra/rule_netlink.c
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Policy Based Routing (PBR) interaction with the kernel using
  * netlink.
  * Copyright (C) 2018  Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/zebra/rule_netlink.h b/zebra/rule_netlink.h
index cf4d978e7..8ffca49b6 100644
--- a/zebra/rule_netlink.h
+++ b/zebra/rule_netlink.h
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Policy Based Routing (PBR) interaction with the kernel using
  * netlink - public definitions and function declarations.
  * Copyright (C) 2018 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _ZEBRA_RULE_NETLINK_H
diff --git a/zebra/rule_socket.c b/zebra/rule_socket.c
index e629017bd..d013749bc 100644
--- a/zebra/rule_socket.c
+++ b/zebra/rule_socket.c
@@ -1,25 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Policy Based Routing (PBR) interaction with the kernel using
  * netlink.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  *                     Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/zebra/sample_plugin.c b/zebra/sample_plugin.c
index e54186bc1..0ccf736f2 100644
--- a/zebra/sample_plugin.c
+++ b/zebra/sample_plugin.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Sample plugin for the FRR zebra dataplane.
  *
  * Copyright (c) 2019 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/zebra/table_manager.c b/zebra/table_manager.c
index a3daca6c5..77ec42e64 100644
--- a/zebra/table_manager.c
+++ b/zebra/table_manager.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra table Manager for routing table identifier management
  * Copyright (C) 2018 6WIND
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/zebra/table_manager.h b/zebra/table_manager.h
index fa1366842..deed4fa30 100644
--- a/zebra/table_manager.h
+++ b/zebra/table_manager.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra table Manager for routing table identifier management
  * Copyright (C) 2018 6WIND
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _TABLE_MANAGER_H
diff --git a/zebra/tc_netlink.c b/zebra/tc_netlink.c
index 757dc1d34..679dc80a5 100644
--- a/zebra/tc_netlink.c
+++ b/zebra/tc_netlink.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Traffic Control (TC) interaction with the kernel using netlink.
  *
  * Copyright (C) 2022 Shichu Yang
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/tc_netlink.h b/zebra/tc_netlink.h
index 166bd917c..5e95e6c1d 100644
--- a/zebra/tc_netlink.h
+++ b/zebra/tc_netlink.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Traffic Control (TC) interaction with the kernel using netlink.
  *
  * Copyright (C) 2022 Shichu Yang
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_TC_NETLINK_H
diff --git a/zebra/tc_socket.c b/zebra/tc_socket.c
index 17373c7af..1bd69ba35 100644
--- a/zebra/tc_socket.c
+++ b/zebra/tc_socket.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Traffic Control (TC) interaction with the kernel using socket.
  *
  * Copyright (C) 2022 Shichu Yang
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zapi_msg.c b/zebra/zapi_msg.c
index 15b579092..b7344d7cc 100644
--- a/zebra/zapi_msg.c
+++ b/zebra/zapi_msg.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra API message creation & consumption.
  * Portions:
  *   Copyright (C) 1997-1999  Kunihiro Ishiguro
  *   Copyright (C) 2015-2018  Cumulus Networks, Inc.
  *   et al.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zapi_msg.h b/zebra/zapi_msg.h
index 4fdc86368..ce8e15446 100644
--- a/zebra/zapi_msg.h
+++ b/zebra/zapi_msg.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra API message creation & consumption.
  * Portions:
  *   Copyright (C) 1997-1999  Kunihiro Ishiguro
  *   Copyright (C) 2015-2018  Cumulus Networks, Inc.
  *   et al.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "lib/if.h"
diff --git a/zebra/zebra_dplane.c b/zebra/zebra_dplane.c
index dea5af44f..af1dd6b5f 100644
--- a/zebra/zebra_dplane.c
+++ b/zebra/zebra_dplane.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra dataplane layer.
  * Copyright (c) 2018 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/zebra/zebra_dplane.h b/zebra/zebra_dplane.h
index 0c8499205..3a4f3c217 100644
--- a/zebra/zebra_dplane.h
+++ b/zebra/zebra_dplane.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra dataplane layer api interfaces.
  * Copyright (c) 2018 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_DPLANE_H
diff --git a/zebra/zebra_errors.c b/zebra/zebra_errors.c
index 7549a3d5c..09b369e23 100644
--- a/zebra/zebra_errors.c
+++ b/zebra/zebra_errors.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra-specific error messages.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  *                     Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_errors.h b/zebra/zebra_errors.h
index 5164de09d..3ac654bda 100644
--- a/zebra/zebra_errors.h
+++ b/zebra/zebra_errors.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra-specific error messages.
  * Copyright (C) 2018  Cumulus Networks, Inc.
  *                     Quentin Young
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __EC_ZEBRAORS_H__
diff --git a/zebra/zebra_evpn.c b/zebra/zebra_evpn.c
index bbe53adb2..ce5e63992 100644
--- a/zebra/zebra_evpn.c
+++ b/zebra/zebra_evpn.c
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra EVPN for VxLAN code
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #include <zebra.h>
 
diff --git a/zebra/zebra_evpn.h b/zebra/zebra_evpn.h
index 8218b7721..c946425dd 100644
--- a/zebra/zebra_evpn.h
+++ b/zebra/zebra_evpn.h
@@ -1,25 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra EVPN Data structures and definitions
  * These are "internal" to this function.
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
  * Copyright (C) 2020 Volta Networks.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _ZEBRA_EVPN_H
diff --git a/zebra/zebra_evpn_mac.c b/zebra/zebra_evpn_mac.c
index 801403c11..a2d310a10 100644
--- a/zebra/zebra_evpn_mac.c
+++ b/zebra/zebra_evpn_mac.c
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra EVPN for VxLAN code
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_evpn_mac.h b/zebra/zebra_evpn_mac.h
index 9b4ea2b79..befb1c398 100644
--- a/zebra/zebra_evpn_mac.h
+++ b/zebra/zebra_evpn_mac.h
@@ -1,25 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra EVPN MAC Data structures and definitions
  * These are "internal" to this function.
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
  * Copyright (C) 2020 Volta Networks.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _ZEBRA_EVPN_MAC_H
diff --git a/zebra/zebra_evpn_mh.c b/zebra/zebra_evpn_mh.c
index 15def89e9..334dde3b1 100644
--- a/zebra/zebra_evpn_mh.c
+++ b/zebra/zebra_evpn_mh.c
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra EVPN multihoming code
  *
  * Copyright (C) 2019 Cumulus Networks, Inc.
  * Anuradha Karuppiah
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_evpn_mh.h b/zebra/zebra_evpn_mh.h
index 12a856950..89a917628 100644
--- a/zebra/zebra_evpn_mh.h
+++ b/zebra/zebra_evpn_mh.h
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra EVPN MH Data structures and definitions
  *
  * Copyright (C) 2019 Cumulus Networks, Inc.
  * Anuradha Karuppiah
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
  */
 
 #ifndef _ZEBRA_EVPN_MH_H
diff --git a/zebra/zebra_evpn_neigh.c b/zebra/zebra_evpn_neigh.c
index 4c7f393fa..acd60aa08 100644
--- a/zebra/zebra_evpn_neigh.c
+++ b/zebra/zebra_evpn_neigh.c
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra EVPN Neighbor code
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_evpn_neigh.h b/zebra/zebra_evpn_neigh.h
index 6119cb8e7..18ef8546d 100644
--- a/zebra/zebra_evpn_neigh.h
+++ b/zebra/zebra_evpn_neigh.h
@@ -1,25 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra EVPN Neighbor Data structures and definitions
  * These are "internal" to this function.
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
  * Copyright (C) 2020 Volta Networks.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _ZEBRA_EVPN_NEIGH_H
diff --git a/zebra/zebra_evpn_vxlan.h b/zebra/zebra_evpn_vxlan.h
index 71df08a7a..80b87f91c 100644
--- a/zebra/zebra_evpn_vxlan.h
+++ b/zebra/zebra_evpn_vxlan.h
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra EVPN for VxLAN code
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 /* Get the VRR interface for SVI if any */
diff --git a/zebra/zebra_fpm.c b/zebra/zebra_fpm.c
index 863bf61aa..15765b5e1 100644
--- a/zebra/zebra_fpm.c
+++ b/zebra/zebra_fpm.c
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Main implementation file for interface to Forwarding Plane Manager.
  *
  * Copyright (C) 2012 by Open Source Routing.
  * Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC")
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_fpm_dt.c b/zebra/zebra_fpm_dt.c
index e39272203..94308a961 100644
--- a/zebra/zebra_fpm_dt.c
+++ b/zebra/zebra_fpm_dt.c
@@ -1,25 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * zebra_fpm_dt.c
  *
  * @copyright Copyright (C) 2016 Sproute Networks, Inc.
  *
  * @author Avneesh Sachdev <avneesh@sproute.com>
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/zebra/zebra_fpm_netlink.c b/zebra/zebra_fpm_netlink.c
index fd1bab21d..5adca14d7 100644
--- a/zebra/zebra_fpm_netlink.c
+++ b/zebra/zebra_fpm_netlink.c
@@ -1,25 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Code for encoding/decoding FPM messages that are in netlink format.
  *
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
  * Copyright (C) 2012 by Open Source Routing.
  * Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC")
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_fpm_private.h b/zebra/zebra_fpm_private.h
index 13415c7e1..e55efc611 100644
--- a/zebra/zebra_fpm_private.h
+++ b/zebra/zebra_fpm_private.h
@@ -1,24 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Private header file for the zebra FPM module.
  *
  * Copyright (C) 2012 by Open Source Routing.
  * Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC")
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_FPM_PRIVATE_H
diff --git a/zebra/zebra_fpm_protobuf.c b/zebra/zebra_fpm_protobuf.c
index d18a62e6f..f3c5ca7c3 100644
--- a/zebra/zebra_fpm_protobuf.c
+++ b/zebra/zebra_fpm_protobuf.c
@@ -1,25 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * zebra_fpm_protobuf.c
  *
  * @copyright Copyright (C) 2016 Sproute Networks, Inc.
  *
  * @author Avneesh Sachdev <avneesh@sproute.com>
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/zebra/zebra_gr.c b/zebra/zebra_gr.c
index d3c104cc8..3bd5b51fb 100644
--- a/zebra/zebra_gr.c
+++ b/zebra/zebra_gr.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra GR related helper functions.
  *
  * Portions:
  *	Copyright (C) 2019 VMware, Inc.
  *	et al.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_l2.c b/zebra/zebra_l2.c
index c5d4c5885..2eea772f9 100644
--- a/zebra/zebra_l2.c
+++ b/zebra/zebra_l2.c
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Layer-2 interface handling code
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_l2.h b/zebra/zebra_l2.h
index e1ce13b16..3be002656 100644
--- a/zebra/zebra_l2.h
+++ b/zebra/zebra_l2.h
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Layer-2 interface Data structures and definitions
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _ZEBRA_L2_H
diff --git a/zebra/zebra_mlag.c b/zebra/zebra_mlag.c
index 5603c1e2f..b4a0c575a 100644
--- a/zebra/zebra_mlag.c
+++ b/zebra/zebra_mlag.c
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra Mlag Code.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #include "zebra.h"
 
diff --git a/zebra/zebra_mlag.h b/zebra/zebra_mlag.h
index eb96a57d3..d60af446b 100644
--- a/zebra/zebra_mlag.h
+++ b/zebra/zebra_mlag.h
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra mlag header.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #ifndef __ZEBRA_MLAG_H__
 #define __ZEBRA_MLAG_H__
diff --git a/zebra/zebra_mlag_private.c b/zebra/zebra_mlag_private.c
index 50a290b9e..334eb6dc4 100644
--- a/zebra/zebra_mlag_private.c
+++ b/zebra/zebra_mlag_private.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * This is an implementation of MLAG Functionality
  *
@@ -6,20 +7,6 @@
  * Author: sathesh Kumar karra <sathk@cumulusnetworks.com>
  *
  * Copyright (C) 2019 Cumulus Networks http://www.cumulusnetworks.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "zebra.h"
 
diff --git a/zebra/zebra_mlag_vty.c b/zebra/zebra_mlag_vty.c
index a1c544d5d..1145d12e0 100644
--- a/zebra/zebra_mlag_vty.c
+++ b/zebra/zebra_mlag_vty.c
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra Mlag vty Code.
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #include <zebra.h>
 
diff --git a/zebra/zebra_mlag_vty.h b/zebra/zebra_mlag_vty.h
index 789154d68..12ecff9e3 100644
--- a/zebra/zebra_mlag_vty.h
+++ b/zebra/zebra_mlag_vty.h
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra Mlag vty Code.
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #ifndef __ZEBRA_MLAG_VTY_CODE__
 #define __ZEBRA_MLAG_VTY_CODE__
diff --git a/zebra/zebra_mpls.c b/zebra/zebra_mpls.c
index aec496112..d25505839 100644
--- a/zebra/zebra_mpls.c
+++ b/zebra/zebra_mpls.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra MPLS code
  * Copyright (C) 2013 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_mpls.h b/zebra/zebra_mpls.h
index 1e63a5957..7feace56b 100644
--- a/zebra/zebra_mpls.h
+++ b/zebra/zebra_mpls.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra MPLS Data structures and definitions
  * Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_MPLS_H
diff --git a/zebra/zebra_mpls_netlink.c b/zebra/zebra_mpls_netlink.c
index ce7702b82..4bc676f39 100644
--- a/zebra/zebra_mpls_netlink.c
+++ b/zebra/zebra_mpls_netlink.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* MPLS forwarding table updates using netlink over GNU/Linux system.
  * Copyright (C) 2016  Cumulus Networks, Inc.
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_mpls_null.c b/zebra/zebra_mpls_null.c
index 2cc3f3b69..ac578930e 100644
--- a/zebra/zebra_mpls_null.c
+++ b/zebra/zebra_mpls_null.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016 by Open Source Routing.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_mpls_openbsd.c b/zebra/zebra_mpls_openbsd.c
index a13f443eb..ee6f7045f 100644
--- a/zebra/zebra_mpls_openbsd.c
+++ b/zebra/zebra_mpls_openbsd.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016 by Open Source Routing.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_mpls_vty.c b/zebra/zebra_mpls_vty.c
index ca66e0310..7e3cdd738 100644
--- a/zebra/zebra_mpls_vty.c
+++ b/zebra/zebra_mpls_vty.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra MPLS VTY functions
  * Copyright (C) 2002 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_mroute.c b/zebra/zebra_mroute.c
index 5d38c3790..881b681c2 100644
--- a/zebra/zebra_mroute.c
+++ b/zebra/zebra_mroute.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra_mroute code
  * Copyright (C) 2016 Cumulus Networks, Inc.
  * Donald Sharp
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_mroute.h b/zebra/zebra_mroute.h
index 6c56c2e41..6f4c4f588 100644
--- a/zebra/zebra_mroute.h
+++ b/zebra/zebra_mroute.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra_mroute.h
  * Copyright (C) 2016 Cumulus Networks, Inc.
  * Donald Sharp
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __ZEBRA_MROUTE_H__
diff --git a/zebra/zebra_nb.c b/zebra/zebra_nb.c
index 5543b3f88..d94547cff 100644
--- a/zebra/zebra_nb.c
+++ b/zebra/zebra_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  Cumulus Networks, Inc.
  * Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_nb.h b/zebra/zebra_nb.h
index 484774521..fa576ec3f 100644
--- a/zebra/zebra_nb.h
+++ b/zebra/zebra_nb.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020 Cumulus Networks, Inc.
  *                    Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef ZEBRA_ZEBRA_NB_H_
diff --git a/zebra/zebra_nb_config.c b/zebra/zebra_nb_config.c
index f68ecc307..336669a49 100644
--- a/zebra/zebra_nb_config.c
+++ b/zebra/zebra_nb_config.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2019  Cumulus Networks, Inc.
  * Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_nb_rpcs.c b/zebra/zebra_nb_rpcs.c
index e7d438b1a..083ab3fde 100644
--- a/zebra/zebra_nb_rpcs.c
+++ b/zebra/zebra_nb_rpcs.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020 Cumulus Networks, Inc.
  *                    Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_nb_state.c b/zebra/zebra_nb_state.c
index 45b9d440a..acf0b80ac 100644
--- a/zebra/zebra_nb_state.c
+++ b/zebra/zebra_nb_state.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020  Cumulus Networks, Inc.
  * Chirag Shah
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_neigh.c b/zebra/zebra_neigh.c
index 09e9a62f6..0c3fb97af 100644
--- a/zebra/zebra_neigh.c
+++ b/zebra/zebra_neigh.c
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra neighbor table management
  *
  * Copyright (C) 2021 Nvidia
  * Anuradha Karuppiah
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_neigh.h b/zebra/zebra_neigh.h
index 953f2e300..b957b5efe 100644
--- a/zebra/zebra_neigh.h
+++ b/zebra/zebra_neigh.h
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra neighbor table management
  *
  * Copyright (C) 2021 Nvidia
  * Anuradha Karuppiah
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
  */
 
 #ifndef _ZEBRA_NEIGH_H
diff --git a/zebra/zebra_netns_id.c b/zebra/zebra_netns_id.c
index 8905b72ec..0531ab959 100644
--- a/zebra/zebra_netns_id.c
+++ b/zebra/zebra_netns_id.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra NETNS ID handling routines
  * those routines are implemented locally to avoid having external dependencies.
  * Copyright (C) 2018 6WIND
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_netns_id.h b/zebra/zebra_netns_id.h
index dd9eab18e..1139fecf8 100644
--- a/zebra/zebra_netns_id.h
+++ b/zebra/zebra_netns_id.h
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra NETNS ID handling routines
  * Copyright (C) 2018 6WIND
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #if !defined(__ZEBRA_NS_ID_H__)
 #define __ZEBRA_NS_ID_H__
diff --git a/zebra/zebra_netns_notify.c b/zebra/zebra_netns_notify.c
index 50b7ff923..cdba0c21a 100644
--- a/zebra/zebra_netns_notify.c
+++ b/zebra/zebra_netns_notify.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra NS collector and notifier for Network NameSpaces
  * Copyright (C) 2017 6WIND
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_netns_notify.h b/zebra/zebra_netns_notify.h
index 18939283a..c701b0f8a 100644
--- a/zebra/zebra_netns_notify.h
+++ b/zebra/zebra_netns_notify.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra NS collector and notifier for Network NameSpaces
  * Copyright (C) 2017 6WIND
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _NETNS_NOTIFY_H
diff --git a/zebra/zebra_nhg.c b/zebra/zebra_nhg.c
index d321ab494..654cf50d4 100644
--- a/zebra/zebra_nhg.c
+++ b/zebra/zebra_nhg.c
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra Nexthop Group Code.
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *                    Donald Sharp
  *                    Stephen Worley
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #include <zebra.h>
 
diff --git a/zebra/zebra_nhg.h b/zebra/zebra_nhg.h
index 9b925bf10..5830952d5 100644
--- a/zebra/zebra_nhg.h
+++ b/zebra/zebra_nhg.h
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra Nexthop Group header.
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *                    Donald Sharp
  *                    Stephen Worley
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #ifndef __ZEBRA_NHG_H__
 #define __ZEBRA_NHG_H__
diff --git a/zebra/zebra_nhg_private.h b/zebra/zebra_nhg_private.h
index 25048258d..2f4a92fec 100644
--- a/zebra/zebra_nhg_private.h
+++ b/zebra/zebra_nhg_private.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Nexthop Group Private Functions.
  * Copyright (C) 2019 Cumulus Networks, Inc.
  *                    Stephen Worley
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
diff --git a/zebra/zebra_ns.c b/zebra/zebra_ns.c
index 457a4955b..6bb5e971e 100644
--- a/zebra/zebra_ns.c
+++ b/zebra/zebra_ns.c
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra NS Routines
  * Copyright (C) 2016 Cumulus Networks, Inc.
  *                    Donald Sharp
  * Copyright (C) 2017/2018 6WIND
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "zebra.h"
 
diff --git a/zebra/zebra_ns.h b/zebra/zebra_ns.h
index 7a0ffbc1e..5e8764854 100644
--- a/zebra/zebra_ns.h
+++ b/zebra/zebra_ns.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra NS header
  * Copyright (C) 2016 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #if !defined(__ZEBRA_NS_H__)
 #define __ZEBRA_NS_H__
diff --git a/zebra/zebra_opaque.c b/zebra/zebra_opaque.c
index d18c5fd5e..7cfb3294e 100644
--- a/zebra/zebra_opaque.c
+++ b/zebra/zebra_opaque.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra opaque message handler module
  * Copyright (c) 2020 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/zebra/zebra_opaque.h b/zebra/zebra_opaque.h
index a9610bfef..86372da42 100644
--- a/zebra/zebra_opaque.h
+++ b/zebra/zebra_opaque.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra opaque message zapi message handler
  * Copyright (c) 2020 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_pbr.c b/zebra/zebra_pbr.c
index b94fabacf..56cac1342 100644
--- a/zebra/zebra_pbr.c
+++ b/zebra/zebra_pbr.c
@@ -1,22 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra Policy Based Routing (PBR) main handling.
  * Copyright (C) 2018  Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_pbr.h b/zebra/zebra_pbr.h
index 60457914c..15ad4e35c 100644
--- a/zebra/zebra_pbr.h
+++ b/zebra/zebra_pbr.h
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Policy Based Routing (PBR) Data structures and definitions
  * These are public definitions referenced by multiple files.
  * Copyright (C) 2018 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _ZEBRA_PBR_H
diff --git a/zebra/zebra_ptm.c b/zebra/zebra_ptm.c
index 937dc090a..a8f4953d5 100644
--- a/zebra/zebra_ptm.c
+++ b/zebra/zebra_ptm.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Kernel routing table updates using netlink over GNU/Linux system.
  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_ptm.h b/zebra/zebra_ptm.h
index 2eed7f301..9cea96555 100644
--- a/zebra/zebra_ptm.h
+++ b/zebra/zebra_ptm.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Definitions for prescriptive topology module (PTM).
  * Copyright (C) 1998, 99, 2000 Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_PTM_H
diff --git a/zebra/zebra_ptm_redistribute.c b/zebra/zebra_ptm_redistribute.c
index 537d69fbc..cab6944a8 100644
--- a/zebra/zebra_ptm_redistribute.c
+++ b/zebra/zebra_ptm_redistribute.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_ptm_redistribute.h b/zebra/zebra_ptm_redistribute.h
index 4daf40582..0fa8a9b79 100644
--- a/zebra/zebra_ptm_redistribute.h
+++ b/zebra/zebra_ptm_redistribute.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 
diff --git a/zebra/zebra_pw.c b/zebra/zebra_pw.c
index be089fc75..dc56ba3c3 100644
--- a/zebra/zebra_pw.c
+++ b/zebra/zebra_pw.c
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra PW code
  * Copyright (C) 2016 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_pw.h b/zebra/zebra_pw.h
index 9800c5853..d939cc07e 100644
--- a/zebra/zebra_pw.h
+++ b/zebra/zebra_pw.h
@@ -1,20 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra PW code
  * Copyright (C) 2016 Volta Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 USA
  */
 
 #ifndef ZEBRA_PW_H_
diff --git a/zebra/zebra_rib.c b/zebra/zebra_rib.c
index 415fc7814..fc3f57eeb 100644
--- a/zebra/zebra_rib.c
+++ b/zebra/zebra_rib.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Routing Information Base.
  * Copyright (C) 1997, 98, 99, 2001 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_rnh.c b/zebra/zebra_rnh.c
index 3bbb1f232..2666dc232 100644
--- a/zebra/zebra_rnh.c
+++ b/zebra/zebra_rnh.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra next hop tracking code
  * Copyright (C) 2013 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_rnh.h b/zebra/zebra_rnh.h
index 88be69a81..07db7bbd7 100644
--- a/zebra/zebra_rnh.h
+++ b/zebra/zebra_rnh.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra next hop tracking header
  * Copyright (C) 2013 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_RNH_H
diff --git a/zebra/zebra_routemap.c b/zebra/zebra_routemap.c
index 8f24404a4..c5bccd05a 100644
--- a/zebra/zebra_routemap.c
+++ b/zebra/zebra_routemap.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* zebra routemap.
  * Copyright (C) 2006 IBM Corporation
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_routemap.h b/zebra/zebra_routemap.h
index 02b01fa53..f77735edc 100644
--- a/zebra/zebra_routemap.h
+++ b/zebra/zebra_routemap.h
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra routemap header
  * Copyright (C) 2015 Cumulus Networks, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef __ZEBRA_ROUTEMAP_H__
diff --git a/zebra/zebra_routemap_nb.c b/zebra/zebra_routemap_nb.c
index 9da458950..11ea7d7ab 100644
--- a/zebra/zebra_routemap_nb.c
+++ b/zebra/zebra_routemap_nb.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_routemap_nb.h b/zebra/zebra_routemap_nb.h
index a43f2b2ae..19b50f3a6 100644
--- a/zebra/zebra_routemap_nb.h
+++ b/zebra/zebra_routemap_nb.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2020        Vmware
  *                           Sarita Patra
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _FRR_ZEBRA_ROUTEMAP_NB_H_
diff --git a/zebra/zebra_router.c b/zebra/zebra_router.c
index a9a7b66ce..21e09a81f 100644
--- a/zebra/zebra_router.c
+++ b/zebra/zebra_router.c
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra Router Code.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #include "zebra.h"
 
diff --git a/zebra/zebra_router.h b/zebra/zebra_router.h
index e0ef86f08..3112fcab4 100644
--- a/zebra/zebra_router.h
+++ b/zebra/zebra_router.h
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra Router header.
  * Copyright (C) 2018 Cumulus Networks, Inc.
  *                    Donald Sharp
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 #ifndef __ZEBRA_ROUTER_H__
 #define __ZEBRA_ROUTER_H__
diff --git a/zebra/zebra_script.c b/zebra/zebra_script.c
index 5c67ad4f1..3f107cb48 100644
--- a/zebra/zebra_script.c
+++ b/zebra/zebra_script.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * frrscript encoders and decoders for data structures in Zebra
  * Copyright (C) 2021 Donald Lee
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "zebra.h"
diff --git a/zebra/zebra_script.h b/zebra/zebra_script.h
index 5eb59753c..85bfe845a 100644
--- a/zebra/zebra_script.h
+++ b/zebra/zebra_script.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * frrscript encoders and decoders for data structures in Zebra
  * Copyright (C) 2021 Donald Lee
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_SCRIPT_H
diff --git a/zebra/zebra_snmp.c b/zebra/zebra_snmp.c
index 6fe24dfa5..c8b652f54 100644
--- a/zebra/zebra_snmp.c
+++ b/zebra/zebra_snmp.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* FIB SNMP.
  * Copyright (C) 1999 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
diff --git a/zebra/zebra_srte.c b/zebra/zebra_srte.c
index d50d3dfe8..c0b83382c 100644
--- a/zebra/zebra_srte.c
+++ b/zebra/zebra_srte.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra SR-TE code
  * Copyright (C) 2020  NetDEF, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_srte.h b/zebra/zebra_srte.h
index dff2f595f..1cdee4540 100644
--- a/zebra/zebra_srte.h
+++ b/zebra/zebra_srte.h
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra's client header.
  * Copyright (C) 2020 Netdef, Inc.
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_SRTE_H
diff --git a/zebra/zebra_srv6.c b/zebra/zebra_srv6.c
index d61e4f804..94b93e5e8 100644
--- a/zebra/zebra_srv6.c
+++ b/zebra/zebra_srv6.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra SRv6 definitions
  * Copyright (C) 2020  Hiroki Shirokura, LINE Corporation
  * Copyright (C) 2020  Masakazu Asama
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_srv6.h b/zebra/zebra_srv6.h
index f320b9ca0..51db83d6f 100644
--- a/zebra/zebra_srv6.h
+++ b/zebra/zebra_srv6.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra SRv6 definitions
  * Copyright (C) 2020  Hiroki Shirokura, LINE Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_SRV6_H
diff --git a/zebra/zebra_srv6_vty.c b/zebra/zebra_srv6_vty.c
index b4fd5f018..3775d3dcd 100644
--- a/zebra/zebra_srv6_vty.c
+++ b/zebra/zebra_srv6_vty.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra SRv6 VTY functions
  * Copyright (C) 2020  Hiroki Shirokura, LINE Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_srv6_vty.h b/zebra/zebra_srv6_vty.h
index 2f8b5048d..f2730b09e 100644
--- a/zebra/zebra_srv6_vty.h
+++ b/zebra/zebra_srv6_vty.h
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra SRv6 VTY functions
  * Copyright (C) 2020  Hiroki Shirokura, LINE Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_SRV6_VTY_H
diff --git a/zebra/zebra_tc.c b/zebra/zebra_tc.c
index 09d9986fb..3d7e03b63 100644
--- a/zebra/zebra_tc.c
+++ b/zebra/zebra_tc.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Traffic Control (TC) main handling.
  *
  * Copyright (C) 2022 Shichu Yang
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_tc.h b/zebra/zebra_tc.h
index 832972b71..335430c93 100644
--- a/zebra/zebra_tc.h
+++ b/zebra/zebra_tc.h
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Traffic Control (TC) Data structures and definitions
  * These are public definitions referenced by multiple files.
  *
  * Copyright (C) 2022 Shichu Yang
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_TC_H
diff --git a/zebra/zebra_trace.h b/zebra/zebra_trace.h
index 374305fcd..17528c4bf 100644
--- a/zebra/zebra_trace.h
+++ b/zebra/zebra_trace.h
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Tracing for zebra
  *
  * Copyright (C) 2020  NVIDIA Corporation
  * Donald Sharp
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #if !defined(__ZEBRA_TRACE_H__) || defined(TRACEPOINT_HEADER_MULTI_READ)
diff --git a/zebra/zebra_vrf.c b/zebra/zebra_vrf.c
index be5e91495..3365cdcdb 100644
--- a/zebra/zebra_vrf.c
+++ b/zebra/zebra_vrf.c
@@ -1,22 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2016 CumulusNetworks
  *                    Donald Sharp
  *
  * This file is part of Quagga
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
 
diff --git a/zebra/zebra_vrf.h b/zebra/zebra_vrf.h
index 02e3c197c..b23b72826 100644
--- a/zebra/zebra_vrf.h
+++ b/zebra/zebra_vrf.h
@@ -1,23 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra Vrf Header
  * Copyright (C) 2016 Cumulus Networks
  *                    Donald Sharp
- *
- * This file is part of Quagga.
- *
- * Quagga is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * Quagga is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #if !defined(__ZEBRA_VRF_H__)
 #define __ZEBRA_VRF_H__
diff --git a/zebra/zebra_vty.c b/zebra/zebra_vty.c
index 3b63821d3..a4aef36db 100644
--- a/zebra/zebra_vty.c
+++ b/zebra/zebra_vty.c
@@ -1,21 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Zebra VTY functions
  * Copyright (C) 2002 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_vxlan.c b/zebra/zebra_vxlan.c
index 4baa3d64a..19f1839ac 100644
--- a/zebra/zebra_vxlan.c
+++ b/zebra/zebra_vxlan.c
@@ -1,23 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra EVPN for VxLAN code
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #include <zebra.h>
diff --git a/zebra/zebra_vxlan.h b/zebra/zebra_vxlan.h
index b33c215c7..98c2767eb 100644
--- a/zebra/zebra_vxlan.h
+++ b/zebra/zebra_vxlan.h
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra VxLAN (EVPN) Data structures and definitions
  * These are public definitions referenced by other files.
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _ZEBRA_VXLAN_H
diff --git a/zebra/zebra_vxlan_private.h b/zebra/zebra_vxlan_private.h
index 7b8cdef40..002fc7db8 100644
--- a/zebra/zebra_vxlan_private.h
+++ b/zebra/zebra_vxlan_private.h
@@ -1,24 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra VxLAN (EVPN) Data structures and definitions
  * These are "internal" to this function.
  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
- *
- * This file is part of FRR.
- *
- * FRR is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * FRR is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with FRR; see the file COPYING.  If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
  */
 
 #ifndef _ZEBRA_VXLAN_PRIVATE_H
diff --git a/zebra/zserv.c b/zebra/zserv.c
index 2024f3453..e064c27ad 100644
--- a/zebra/zserv.c
+++ b/zebra/zserv.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra API server.
  * Portions:
  *   Copyright (C) 1997-1999  Kunihiro Ishiguro
  *   Copyright (C) 2015-2018  Cumulus Networks, Inc.
  *   et al.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <zebra.h>
diff --git a/zebra/zserv.h b/zebra/zserv.h
index cfc33f916..1226cd711 100644
--- a/zebra/zserv.h
+++ b/zebra/zserv.h
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Zebra API server.
  * Portions:
  *   Copyright (C) 1997-1999  Kunihiro Ishiguro
  *   Copyright (C) 2015-2018  Cumulus Networks, Inc.
  *   et al.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; see the file COPYING; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef _ZEBRA_ZSERV_H