*: manual SPDX License ID conversions

The files converted in this commit either had some random misspelling or
formatting weirdness that made them escape automated replacement, or
have a particularly "weird" licensing setup (e.g. dual-licensed.)

This also marks a bunch of "public domain" files as SPDX License "NONE".

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

65 files changed, 75 insertions, 849 deletions

diff --git a/bfdd/bfddp_packet.h b/bfdd/bfddp_packet.h
index 4ece94f577..afcbdd7581 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/bgpd/rfapi/rfapi_import.c b/bgpd/rfapi/rfapi_import.c
index 5db40be362..6d4fc53f83 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/buildtest.sh b/buildtest.sh
index eeae82fc44..7edc4a5ee1 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/fpm/fpm.h b/fpm/fpm.h
index 0da8a5a8be..b08310f675 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 4597c7f8eb..9f0917feae 100644
--- a/fpm/fpm.proto
+++ b/fpm/fpm.proto
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 //
 // fpm.proto
 //
diff --git a/grpc/frr-northbound.proto b/grpc/frr-northbound.proto
index 32544ba694..b3b1dc465b 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 ab724498aa..6788b58799 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/lib/base64.c b/lib/base64.c
index 6f0be039f1..1507b0252b 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 3dc1559aa4..839f92aa7c 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/command_lex.l b/lib/command_lex.l
index ec366ce7e1..64f74498b8 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_parse.y b/lib/command_parse.y
index 35c119691b..a29e090ef0 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/db.c b/lib/db.c
index b4286b8d2c..55f29adfb5 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 c8ce7fe57d..887af0e1b6 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/defun_lex.l b/lib/defun_lex.l
index af506f13d6..505ea59b0b 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/freebsd-queue.h b/lib/freebsd-queue.h
index 793cfff8d3..d53df9c77b 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/northbound_grpc.cpp b/lib/northbound_grpc.cpp
index 95721ffc77..f5d59d92d6 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/openbsd-queue.h b/lib/openbsd-queue.h
index d4c08a3be8..df3bbd720f 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 98d2e155e3..c09ac2fd40 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 832a10141e..4f3985bbca 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/printf/glue.c b/lib/printf/glue.c
index 3ac6e2c0ae..25e2ff37a3 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/route_types.pl b/lib/route_types.pl
index 8c216e13bd..c75a866964 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/seqlock.c b/lib/seqlock.c
index 77673146ea..62ce316920 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 bfbf97890e..01735814fb 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/strlcat.c b/lib/strlcat.c
index a046822a94..e3e29a72f3 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 71ee9f1a54..74ea9cbc9c 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/typerb.c b/lib/typerb.c
index fe142ff354..af04307ca6 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/version.h.in b/lib/version.h.in
index 5078f3ad6e..7c31379041 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/nhrpd/nhrp_protocol.h b/nhrpd/nhrp_protocol.h
index 3b94c814d6..8cf1ebbcd6 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/pimd/mtracebis_netlink.c b/pimd/mtracebis_netlink.c
index 9bdf949007..16873ed3e7 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 46e176e726..1f22927d4a 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/qpb/qpb.proto b/qpb/qpb.proto
index c06debb954..b09536832c 100644
--- a/qpb/qpb.proto
+++ b/qpb/qpb.proto
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: ISC
 /*
  * qpb.proto
  *
diff --git a/tests/lib/test_grpc.cpp b/tests/lib/test_grpc.cpp
index 88372f45a5..282161c3df 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/topotests/bgp_default_originate/test_bgp_default_originate_2links.py b/tests/topotests/bgp_default_originate/test_bgp_default_originate_2links.py
index 4d7f436eac..50c34d45fa 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 814272374a..6156968ded 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 8e6f930633..59f833b93c 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 9e5250406b..eca41e3b9e 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 fa5164fb71..4dedac5535 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 9e3a3b5660..82c4e7e0ab 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/docker/build.sh b/tests/topotests/docker/build.sh
index 70ce2efe85..aec20587ba 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 1eaaea2971..ce373d9bd0 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 495beaf3cc..3b296a1497 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 451d0a27d9..44e16db4b9 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 d78d5006bc..4ebacbb239 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 67142f04ce..926a25ca65 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/tools/build-debian-package.sh b/tools/build-debian-package.sh
index 3c922c355c..d614ba01d9 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 db6460f343..69eb0ef954 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;
diff --git a/tools/fixup-deprecated.py b/tools/fixup-deprecated.py
index 57f9df9065..ad3ae54aba 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 8ce754fecc..51e8fb7b7e 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 ed3ad956b8..16ad18bed7 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 fca4bc1f97..4d2985cf79 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.vim b/tools/frr.vim
index 7cc248f4cf..19ac3fc99b 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 27d830a119..4d974ad356 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 0a24b091a3..2240a171b4 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 599dbc56f9..373ef07242 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/indent.py b/tools/indent.py
index 61a0fd4454..fe9eb7c252 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 5dce43fe84..e7eaf46f66 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/render_md.py b/tools/render_md.py
index 7636496b62..80e26f341c 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 e196a372e4..9f566bd1e2 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 1c75c86a0d..29fcb86ea1 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 eefeee3b05..b136ce5901 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 ce0bfde0a5..7d37a1a314 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 5307fa3878..77af50085e 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/vtysh/daemons.pl b/vtysh/daemons.pl
index fc95173406..c75bae0c1f 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/yang/embedmodel.py b/yang/embedmodel.py
index c532973d7c..6d37839cf3 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/zebra/debug_nl.c b/zebra/debug_nl.c
index afefab6674..df0b5aae7b 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>