diff --git a/lib/rst/interp_float/distance.c b/lib/rst/interp_float/distance.c
index a17aeb1abc8..e14526c2d2f 100644
--- a/lib/rst/interp_float/distance.c
+++ b/lib/rst/interp_float/distance.c
@@ -1,8 +1,11 @@
 /*-
  * Written by H. Mitasova, I. Kosinovsky, D. Gerdes Fall 1993
  * US Army Construction Engineering Research Lab
- * Copyright 1993, H. Mitasova (University of Illinois),
- * I. Kosinovsky, (USA-CERL), and D.Gerdes (USA-CERL)
+ * SPDX-FileCopyrightText: 1993 H. Mitasova (University of Illinois)
+ * SPDX-FileCopyrightText: 1993 I. Kosinovsky (USA-CERL)
+ * SPDX-FileCopyrightText: 1993 D.Gerdes (USA-CERL)
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  *
  * modified by McCauley in August 1995
  * modified by Mitasova in August 1995
diff --git a/lib/rst/interp_float/minmax.c b/lib/rst/interp_float/minmax.c
index f7296afd6ec..8d3f2c6213c 100644
--- a/lib/rst/interp_float/minmax.c
+++ b/lib/rst/interp_float/minmax.c
@@ -2,9 +2,11 @@
  * Written by H. Mitasova, L. Mitas, I. Kosinovsky, D. Gerdes Fall 1994
  * University of Illinois
  * US Army Construction Engineering Research Lab
- * Copyright 1994, H. Mitasova (University of Illinois),
- * L. Mitas (University of Illinois),
- * I. Kosinovsky, (USA-CERL), and D.Gerdes (USA-CERL)
+ * SPDX-FileCopyrightText: 1994 H. Mitasova (University of Illinois)
+ * SPDX-FileCopyrightText: 1994 I. Kosinovsky (USA-CERL)
+ * SPDX-FileCopyrightText: 1994 D.Gerdes (USA-CERL)
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  *
  * modified by McCauley in August 1995
  * modified by Mitasova in August 1995
diff --git a/lib/rst/interp_float/resout2d.c b/lib/rst/interp_float/resout2d.c
index d2468256411..93c574345a1 100644
--- a/lib/rst/interp_float/resout2d.c
+++ b/lib/rst/interp_float/resout2d.c
@@ -2,8 +2,11 @@
  * Written by H. Mitasova, I. Kosinovsky, D. Gerdes Summer 1993
  * University of Illinois
  * US Army Construction Engineering Research Lab
- * Copyright 1993, H. Mitasova (University of Illinois),
- * I. Kosinovsky, (USA-CERL), and D.Gerdes (USA-CERL)
+ * SPDX-FileCopyrightText: 1993 H. Mitasova (University of Illinois)
+ * SPDX-FileCopyrightText: 1993 I. Kosinovsky (USA-CERL)
+ * SPDX-FileCopyrightText: 1993 D.Gerdes (USA-CERL)
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  *
  * modified by McCauley in August 1995
  * modified by Mitasova in August 1995
diff --git a/lib/rst/interp_float/ressegm2d.c b/lib/rst/interp_float/ressegm2d.c
index a22d6f82fbb..12e28007387 100644
--- a/lib/rst/interp_float/ressegm2d.c
+++ b/lib/rst/interp_float/ressegm2d.c
@@ -2,8 +2,11 @@
  * Written by H. Mitasova, I. Kosinovsky, D. Gerdes Summer 1993
  * University of Illinois
  * US Army Construction Engineering Research Lab
- * Copyright 1993, H. Mitasova (University of Illinois),
- * I. Kosinovsky, (USA-CERL), and D.Gerdes (USA-CERL)
+ * SPDX-FileCopyrightText: 1993 H. Mitasova (University of Illinois)
+ * SPDX-FileCopyrightText: 1993 I. Kosinovsky (USA-CERL)
+ * SPDX-FileCopyrightText: 1993 D.Gerdes (USA-CERL)
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  *
  * modified by McCauley in August 1995
  * modified by Mitasova in August 1995
diff --git a/raster/r.resamp.rst/main.c b/raster/r.resamp.rst/main.c
index 69e64b22d29..6ce20e8d0b1 100644
--- a/raster/r.resamp.rst/main.c
+++ b/raster/r.resamp.rst/main.c
@@ -4,23 +4,11 @@
  * Written by H. Mitasova, I. Kosinovsky, D. Gerdes Summer 1993
  * University of Illinois
  * US Army Construction Engineering Research Lab
- * Copyright 1993, H. Mitasova (University of Illinois),
- * I. Kosinovsky, (USA-CERL), and D.Gerdes (USA-CERL)
- *
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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
+ * SPDX-FileCopyrightText: 1993 H. Mitasova (University of Illinois)
+ * SPDX-FileCopyrightText: 1993 I. Kosinovsky (USA-CERL)
+ * SPDX-FileCopyrightText: 1993 D.Gerdes (USA-CERL)
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  *
  *
  * modified by McCauley in August 1995
diff --git a/raster/r.sun/main.c b/raster/r.sun/main.c
index f0206040ec0..d41e485d3a3 100644
--- a/raster/r.sun/main.c
+++ b/raster/r.sun/main.c
@@ -4,29 +4,11 @@ r.sun: This program was written by Jaro Hofierka in Summer 1993 and
  from JRC in Ispra a new version of r.sun was prepared using ESRA solar
  radiation formulas.
 See manual pages for details.
-(C) 2002 Copyright Jaro Hofierka, Gresaka 22, 085 01 Bardejov, Slovakia,
-              and GeoModel, s.r.o., Bratislava, Slovakia
-email: hofierka@geomodel.sk,marcel.suri@jrc.it,
-       suri@geomodel.sk Thomas.Huld@jrc.it
-(c) 2003-2013 by the GRASS Development Team
+SPDX-FileCopyrightText: 2002 Jaro Hofierka
+SPDX-FileCopyrightText: 2002 GeoModel, s.r.o.
+SPDX-FileCopyrightText: Other GRASS authors
+SPDX-License-Identifier: GPL-2.0-or-later
 ******************************************************************************/
-/*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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
- */
-
 /*v. 2.0 July 2002, NULL data handling, JH */
 /*v. 2.1 January 2003, code optimization by Thomas Huld, JH */
 /*v. 3.0 February 2006, several changes (shadowing algorithm, earth's curvature
diff --git a/raster/r.sun/rsunglobals.h b/raster/r.sun/rsunglobals.h
index 896eac77ac0..b9aa0e8c6e0 100644
--- a/raster/r.sun/rsunglobals.h
+++ b/raster/r.sun/rsunglobals.h
@@ -4,27 +4,11 @@ r.sun: rsunglobals.h. This program was written by Jaro Hofierka in Summer 1993
  from JRC in Ispra a new version of r.sun was prepared using ESRA solar
  radiation formulas.
 See manual pages for details.
-(C) 2002 Copyright Jaro Hofierka, Gresaka 22, 085 01 Bardejov, Slovakia,
-              and GeoModel, s.r.o., Bratislava, Slovakia
-email: hofierka@geomodel.sk,marcel.suri@jrc.it,suri@geomodel.sk
+SPDX-FileCopyrightText: 2002 Jaro Hofierka
+SPDX-FileCopyrightText: 2002 GeoModel, s.r.o.
+SPDX-FileCopyrightText: Other GRASS authors
+SPDX-License-Identifier: GPL-2.0-or-later
 ******************************************************************************/
-/*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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
- */
-
 /*v. 2.0 July 2002, NULL data handling, JH */
 /*v. 2.1 January 2003, code optimization by Thomas Huld, JH */
 
diff --git a/raster/r.sun/rsunlib.c b/raster/r.sun/rsunlib.c
index a19c4f46c60..c1c8e6c441b 100644
--- a/raster/r.sun/rsunlib.c
+++ b/raster/r.sun/rsunlib.c
@@ -4,29 +4,14 @@
    Thomas Huld from JRC in Ispra a new version of r.sun was prepared using
    ESRA solar radiation formulas.  See the manual page for details.
 
-  (C) 2002 Copyright Jaro Hofierka, Gresaka 22, 085 01 Bardejov, Slovakia,
-               and GeoModel, s.r.o., Bratislava, Slovakia
-  email: hofierka at geomodel.sk, marcel.suri at jrc.it, suri at geomodel.sk
+  SPDX-FileCopyrightText: 2002 Jaro Hofierka
+  SPDX-FileCopyrightText: 2002 GeoModel, s.r.o.
+  SPDX-FileCopyrightText: 2011 Hamish Bowman
+  SPDX-FileCopyrightText: Other GRASS authors
+  SPDX-License-Identifier: GPL-2.0-or-later
 
   (C) 2011 by Hamish Bowman, and the GRASS Development Team
 ****************************************************************************/
-/*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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
- */
-
 /*v. 2.0 July 2002, NULL data handling, JH */
 /*v. 2.1 January 2003, code optimization by Thomas Huld, JH */
 
diff --git a/raster/r.sun/sunradstruct.h b/raster/r.sun/sunradstruct.h
index ef40e9a04d9..ea3d51d23df 100644
--- a/raster/r.sun/sunradstruct.h
+++ b/raster/r.sun/sunradstruct.h
@@ -4,27 +4,11 @@ r.sun: sunradstruct.h. This program was written by Jaro Hofierka in Summer 1993
  from JRC in Ispra a new version of r.sun was prepared using ESRA solar
  radiation formulas.
 See manual pages for details.
-(C) 2002 Copyright Jaro Hofierka, Gresaka 22, 085 01 Bardejov, Slovakia,
-              and GeoModel, s.r.o., Bratislava, Slovakia
-email: hofierka@geomodel.sk,marcel.suri@jrc.it,suri@geomodel.sk
+SPDX-FileCopyrightText: 2002 Jaro Hofierka
+SPDX-FileCopyrightText: 2002 GeoModel, s.r.o.
+SPDX-FileCopyrightText: Other GRASS authors
+SPDX-License-Identifier: GPL-2.0-or-later
 *******************************************************************************/
-/*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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
- */
-
 /*v. 2.0 July 2002, NULL data handling, JH */
 /*v. 2.1 January 2003, code optimization by Thomas Huld, JH */
 
diff --git a/raster/r.surf.area/main.c b/raster/r.surf.area/main.c
index 0d73530cded..85a640800f6 100644
--- a/raster/r.surf.area/main.c
+++ b/raster/r.surf.area/main.c
@@ -1,24 +1,10 @@
 /* main.c - r.surf.area */
 
-/* Copyright Notice
- * ----------------
- * Written by Bill Brown, USACERL December 21, 1994
- * Copyright 1994, Bill Brown, USACERL
- * brown@gis.uiuc.edu
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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
+*Written by Bill Brown, USACERL December 21,
+    1994
+/* SPDX-FileCopyrightText: 1994 Bill Brown, USACERL <brown@gis.uiuc.edu>
+/* SPDX-FileCopyrightText: Other GRASS authors
+/* SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 /* Calculates area of regular 3D triangulated points
@@ -57,7 +43,7 @@
 
 #include "local_proto.h"
 
-int main(int argc, char *argv[])
+    int main(int argc, char *argv[])
 {
     struct GModule *module;
     struct {
diff --git a/vector/v.lrs/v.lrs.segment/main.c b/vector/v.lrs/v.lrs.segment/main.c
index e579ba0fece..492bd349f2f 100644
--- a/vector/v.lrs/v.lrs.segment/main.c
+++ b/vector/v.lrs/v.lrs.segment/main.c
@@ -4,26 +4,10 @@
  */
 
 /******************************************************************************
- * Copyright (c) 2004-2007, Radim Blazek (blazek@itc.it),
- *                          Hamish Bowman (side_offset bits)
- *
- * 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.
+ * SPDX-FileCopyrightText: 2004-2007 Radim Blazek <blazek@itc.it>
+ * SPDX-FileCopyrightText: 2004-2007 Hamish Bowman (side_offset bits)
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: MIT
  *****************************************************************************/
 
 #include <stdlib.h>
diff --git a/vector/v.normal/scancats.c b/vector/v.normal/scancats.c
index c8258a1324e..70b3bdb6ac6 100644
--- a/vector/v.normal/scancats.c
+++ b/vector/v.normal/scancats.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994-1995. James Darrell McCauley. (darrell@mccauley-usa.com)
- *                                http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994-1995 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>
diff --git a/vector/v.perturb/fische.c b/vector/v.perturb/fische.c
index a132a753f99..163b63bcd78 100644
--- a/vector/v.perturb/fische.c
+++ b/vector/v.perturb/fische.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994. James Darrell McCauley.  (darrell@mccauley-usa.com)
- *                                              http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>
diff --git a/vector/v.perturb/myrng.c b/vector/v.perturb/myrng.c
index c336d451620..b520a1d3211 100644
--- a/vector/v.perturb/myrng.c
+++ b/vector/v.perturb/myrng.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994. James Darrell McCauley.  (darrell@mccauley-usa.com)
- *                                              http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>
diff --git a/vector/v.perturb/normal00.c b/vector/v.perturb/normal00.c
index ddc8875432f..483f215b9cd 100644
--- a/vector/v.perturb/normal00.c
+++ b/vector/v.perturb/normal00.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994. James Darrell McCauley.  (darrell@mccauley-usa.com)
- *                                              http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>
diff --git a/vector/v.perturb/normalen.c b/vector/v.perturb/normalen.c
index bd2e94bc497..96cc25152ea 100644
--- a/vector/v.perturb/normalen.c
+++ b/vector/v.perturb/normalen.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994. James Darrell McCauley.  (darrell@mccauley-usa.com)
- *                                              http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>
diff --git a/vector/v.perturb/normalrs.c b/vector/v.perturb/normalrs.c
index 5fab6058fa7..1ae0a651d61 100644
--- a/vector/v.perturb/normalrs.c
+++ b/vector/v.perturb/normalrs.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994. James Darrell McCauley.  (darrell@mccauley-usa.com)
- *                                              http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>
diff --git a/vector/v.perturb/normalsv.c b/vector/v.perturb/normalsv.c
index e232cc18696..ab56a132d48 100644
--- a/vector/v.perturb/normalsv.c
+++ b/vector/v.perturb/normalsv.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994. James Darrell McCauley.  (darrell@mccauley-usa.com)
- *                                              http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>
diff --git a/vector/v.perturb/zufall.h b/vector/v.perturb/zufall.h
index 43d544e468d..4f3f04782e1 100644
--- a/vector/v.perturb/zufall.h
+++ b/vector/v.perturb/zufall.h
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994. James Darrell McCauley.  (darrell@mccauley-usa.com)
- *                                              http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #define min(a, b) ((a) <= (b) ? (a) : (b))
diff --git a/vector/v.qcount/count.c b/vector/v.qcount/count.c
index 68dd5b04309..d3138f8b1a1 100644
--- a/vector/v.qcount/count.c
+++ b/vector/v.qcount/count.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994-1995. James Darrell McCauley. (darrell@mccauley-usa.com)
- *                                http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994-1995 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>
diff --git a/vector/v.qcount/findquads.c b/vector/v.qcount/findquads.c
index 7f8c447710c..1d5bf6d18fe 100644
--- a/vector/v.qcount/findquads.c
+++ b/vector/v.qcount/findquads.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994-1995. James Darrell McCauley. (darrell@mccauley-usa.com)
- *                                http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994-1995 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdlib.h>
diff --git a/vector/v.qcount/indices.c b/vector/v.qcount/indices.c
index f8db511f674..dea9a5bbc58 100644
--- a/vector/v.qcount/indices.c
+++ b/vector/v.qcount/indices.c
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994-1995. James Darrell McCauley. (darrell@mccauley-usa.com)
- *                                http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994-1995 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <grass/gis.h>
diff --git a/vector/v.qcount/quaddefs.h b/vector/v.qcount/quaddefs.h
index d3a5157dbf9..16a91341c9b 100644
--- a/vector/v.qcount/quaddefs.h
+++ b/vector/v.qcount/quaddefs.h
@@ -1,9 +1,7 @@
 /*
- * Copyright (C) 1994-1995. James Darrell McCauley. (darrell@mccauley-usa.com)
- *                                http://mccauley-usa.com/
- *
- * This program is free software under the GPL (>=v2)
- * Read the file GPL.TXT coming with GRASS for details.
+ * SPDX-FileCopyrightText: 1994-1995 James Darrell McCauley
+ * SPDX-FileCopyrightText: Other GRASS authors
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 typedef struct {