diff --git a/src/rtos/FreeRTOS.c b/src/rtos/FreeRTOS.c
index f7ce8cd56..499759ab3 100644
--- a/src/rtos/FreeRTOS.c
+++ b/src/rtos/FreeRTOS.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/ThreadX.c b/src/rtos/ThreadX.c
index 4161e63fa..a60d5f8bb 100644
--- a/src/rtos/ThreadX.c
+++ b/src/rtos/ThreadX.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/chibios.c b/src/rtos/chibios.c
index ef1f34d51..001abfa24 100644
--- a/src/rtos/chibios.c
+++ b/src/rtos/chibios.c
@@ -1,22 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2012 by Matthias Blaicher                               *
  *   Matthias Blaicher - matthias@blaicher.com                             *
  *                                                                         *
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/eCos.c b/src/rtos/eCos.c
index a81d7b993..8e982dacb 100644
--- a/src/rtos/eCos.c
+++ b/src/rtos/eCos.c
@@ -1,17 +1,6 @@
+/* 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, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/embKernel.c b/src/rtos/embKernel.c
index d70ae37d9..23e7bc64b 100644
--- a/src/rtos/embKernel.c
+++ b/src/rtos/embKernel.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/hwthread.c b/src/rtos/hwthread.c
index 7c998861f..db44b0094 100644
--- a/src/rtos/hwthread.c
+++ b/src/rtos/hwthread.c
@@ -1,18 +1,4 @@
-/***************************************************************************
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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, see <http://www.gnu.org/licenses/>. *
- ***************************************************************************/
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
diff --git a/src/rtos/linux.c b/src/rtos/linux.c
index d147c1cf0..3fdcb4383 100644
--- a/src/rtos/linux.c
+++ b/src/rtos/linux.c
@@ -1,20 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by STEricsson                                      *
  *   Heythem Bouhaja heythem.bouhaja@stericsson.com   : creation           *
  *   Michel JAOUEN michel.jaouen@stericsson.com : adaptation to rtos       *
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/mqx.c b/src/rtos/mqx.c
index 754470e3c..a724db003 100644
--- a/src/rtos/mqx.c
+++ b/src/rtos/mqx.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2014 by Marian Cingel                                   *
  *   cingel.marian@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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/nuttx.c b/src/rtos/nuttx.c
index f0b304861..3afad3d02 100644
--- a/src/rtos/nuttx.c
+++ b/src/rtos/nuttx.c
@@ -1,20 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright 2016,2017 Sony Video & Sound Products Inc.                  *
  *   Masatoshi Tateishi - Masatoshi.Tateishi@jp.sony.com                   *
  *   Masayuki Ishikawa - Masayuki.Ishikawa@jp.sony.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/nuttx_header.h b/src/rtos/nuttx_header.h
index 00b0484ee..3436df1eb 100644
--- a/src/rtos/nuttx_header.h
+++ b/src/rtos/nuttx_header.h
@@ -1,20 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright 2016,2017 Sony Video & Sound Products Inc.                  *
  *   Masatoshi Tateishi - Masatoshi.Tateishi@jp.sony.com                   *
  *   Masayuki Ishikawa - Masayuki.Ishikawa@jp.sony.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifndef OPENOCD_RTOS_NUTTX_HEADER_H
diff --git a/src/rtos/riot.c b/src/rtos/riot.c
index 8a3874202..6717085d5 100644
--- a/src/rtos/riot.c
+++ b/src/rtos/riot.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2015 by Daniel Krebs                                    *
  *   Daniel Krebs - github@daniel-krebs.net                                *
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/rtos.c b/src/rtos/rtos.c
index f401c3d30..013080bb0 100644
--- a/src/rtos/rtos.c
+++ b/src/rtos/rtos.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/rtos.h b/src/rtos/rtos.h
index 8309de402..ace57514a 100644
--- a/src/rtos/rtos.h
+++ b/src/rtos/rtos.h
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifndef OPENOCD_RTOS_RTOS_H
diff --git a/src/rtos/rtos_chibios_stackings.c b/src/rtos/rtos_chibios_stackings.c
index 77bcb86cb..bd1717161 100644
--- a/src/rtos/rtos_chibios_stackings.c
+++ b/src/rtos/rtos_chibios_stackings.c
@@ -1,22 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2012 by Matthias Blaicher                               *
  *   Matthias Blaicher - matthias@blaicher.com                             *
  *                                                                         *
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/rtos_chibios_stackings.h b/src/rtos/rtos_chibios_stackings.h
index 130aaa18f..23ad44ae3 100644
--- a/src/rtos/rtos_chibios_stackings.h
+++ b/src/rtos/rtos_chibios_stackings.h
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifndef OPENOCD_RTOS_RTOS_CHIBIOS_STACKINGS_H
diff --git a/src/rtos/rtos_ecos_stackings.c b/src/rtos/rtos_ecos_stackings.c
index 4745470ce..f5c08fe73 100644
--- a/src/rtos/rtos_ecos_stackings.c
+++ b/src/rtos/rtos_ecos_stackings.c
@@ -1,18 +1,4 @@
-/***************************************************************************
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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, see <http://www.gnu.org/licenses/>. *
- ***************************************************************************/
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
diff --git a/src/rtos/rtos_ecos_stackings.h b/src/rtos/rtos_ecos_stackings.h
index d66d05fe9..0375e2d1c 100644
--- a/src/rtos/rtos_ecos_stackings.h
+++ b/src/rtos/rtos_ecos_stackings.h
@@ -1,18 +1,4 @@
-/***************************************************************************
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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, see <http://www.gnu.org/licenses/>. *
- ***************************************************************************/
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 
 #ifndef OPENOCD_RTOS_RTOS_ECOS_STACKINGS_H
 #define OPENOCD_RTOS_RTOS_ECOS_STACKINGS_H
diff --git a/src/rtos/rtos_embkernel_stackings.c b/src/rtos/rtos_embkernel_stackings.c
index df1fc51f2..46e13bc2f 100644
--- a/src/rtos/rtos_embkernel_stackings.c
+++ b/src/rtos/rtos_embkernel_stackings.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/rtos_embkernel_stackings.h b/src/rtos/rtos_embkernel_stackings.h
index 7850bebcd..972bce66d 100644
--- a/src/rtos/rtos_embkernel_stackings.h
+++ b/src/rtos/rtos_embkernel_stackings.h
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifndef OPENOCD_RTOS_RTOS_EMBKERNEL_STACKINGS_H
diff --git a/src/rtos/rtos_mqx_stackings.c b/src/rtos/rtos_mqx_stackings.c
index f99190ea5..90a2e0161 100644
--- a/src/rtos/rtos_mqx_stackings.c
+++ b/src/rtos/rtos_mqx_stackings.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2014 by Marian Cingel                                   *
  *   cingel.marian@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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/rtos_mqx_stackings.h b/src/rtos/rtos_mqx_stackings.h
index 6ebd28789..f86c05a40 100644
--- a/src/rtos/rtos_mqx_stackings.h
+++ b/src/rtos/rtos_mqx_stackings.h
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2014 by Marian Cingel                                   *
  *   cingel.marian@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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifndef OPENOCD_RTOS_RTOS_MQX_STACKINGS_H
diff --git a/src/rtos/rtos_riot_stackings.c b/src/rtos/rtos_riot_stackings.c
index 84e1f7ff8..30eecd6b7 100644
--- a/src/rtos/rtos_riot_stackings.c
+++ b/src/rtos/rtos_riot_stackings.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2015 by Daniel Krebs                                    *
  *   Daniel Krebs - github@daniel-krebs.net                                *
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/rtos_riot_stackings.h b/src/rtos/rtos_riot_stackings.h
index c5b8f59e2..3b6c5f41c 100644
--- a/src/rtos/rtos_riot_stackings.h
+++ b/src/rtos/rtos_riot_stackings.h
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2015 by Daniel Krebs                                    *
  *   Daniel Krebs - github@daniel-krebs.net                                *
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 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, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifndef OPENOCD_RTOS_RTOS_RIOT_STACKINGS_H
diff --git a/src/rtos/rtos_standard_stackings.c b/src/rtos/rtos_standard_stackings.c
index fe890413f..ebdc64c2a 100644
--- a/src/rtos/rtos_standard_stackings.c
+++ b/src/rtos/rtos_standard_stackings.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/rtos_standard_stackings.h b/src/rtos/rtos_standard_stackings.h
index d18f1797c..83ca07f9e 100644
--- a/src/rtos/rtos_standard_stackings.h
+++ b/src/rtos/rtos_standard_stackings.h
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2011 by Broadcom Corporation                            *
  *   Evan Hunter - ehunter@broadcom.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifndef OPENOCD_RTOS_RTOS_STANDARD_STACKINGS_H
diff --git a/src/rtos/rtos_ucos_iii_stackings.c b/src/rtos/rtos_ucos_iii_stackings.c
index 0d533b55e..866251820 100644
--- a/src/rtos/rtos_ucos_iii_stackings.c
+++ b/src/rtos/rtos_ucos_iii_stackings.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2017 by Square, Inc.                                    *
  *   Steven Stallion <stallion@squareup.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/rtos/rtos_ucos_iii_stackings.h b/src/rtos/rtos_ucos_iii_stackings.h
index f2f120fd9..831c68e1c 100644
--- a/src/rtos/rtos_ucos_iii_stackings.h
+++ b/src/rtos/rtos_ucos_iii_stackings.h
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2017 by Square, Inc.                                    *
  *   Steven Stallion <stallion@squareup.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifndef OPENOCD_RTOS_RTOS_UCOS_III_STACKINGS_H
diff --git a/src/rtos/uCOS-III.c b/src/rtos/uCOS-III.c
index 385c8d841..754fe064b 100644
--- a/src/rtos/uCOS-III.c
+++ b/src/rtos/uCOS-III.c
@@ -1,19 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2017 by Square, Inc.                                    *
  *   Steven Stallion <stallion@squareup.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.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifdef HAVE_CONFIG_H