All: Add 'SPDX-License-Identifier' headers to all source files.

(GPL-3.0+ for everything but the S6145 backend, which is GPL-3.0+
   with an additional permission)

Makefile

@@ -1,3 +1,8 @@
+### Makefile for selphy_print and family
+#
+#  SPDX-License-Identifier: GPL-3.0+
+#
+
 # Basic stuff
 EXEC_NAME ?= dyesub_backend
 #NO_GUTENPRINT = 1

README

@@ -4,8 +4,10 @@
 
   Copyright (c) 2007-2017 Solomon Peachy <pizza@shaftnet.org>
 
-  This free software comes with ABSOLUTELY NO WARRANTY! 
-  Licensed under the GNU GPL, see the 'COPYING' file for more details.
+  This free software comes with ABSOLUTELY NO WARRANTY and is licensed under
+   the GNU GPL (v3 or later); see the 'COPYING' file for more details.
+
+  SPDX-License-Identifier: GPL-3.0+
 
   The latest version can be found at
   

backend_canonselphy.c

@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_canonselphyneo.c

@@ -1,7 +1,7 @@
 /*
  *   Canon SELPHY CPneo series CUPS backend -- libusb-1.0 version
  *
- *   (c) 2016 Solomon Peachy <pizza@shaftnet.org>
+ *   (c) 2016-2017 Solomon Peachy <pizza@shaftnet.org>
  *
  *   The latest version of this program can be found at:
  *
@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_citizencw01.c

@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_common.c

@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include "backend_common.h"

backend_common.h

@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_dnpds40.c

@@ -29,6 +29,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 //#define DNP_ONLY

backend_kodak1400.c

@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_kodak605.c

@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_kodak6800.c

@@ -27,6 +27,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_magicard.c

@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_mitsu70x.c

@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_mitsu9550.c

@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_mitsup95d.c

@@ -27,6 +27,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_shinkos1245.c

@@ -25,6 +25,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_shinkos2145.c

@@ -27,6 +27,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_shinkos6145.c

@@ -33,6 +33,8 @@
  *   You must still adhere to all other terms of the license to this program
  *   (ie GPLv3) and the license of the libS6145ImageProcess library.
  *
+ *   SPDX-License-Identifier: GPL-3.0+ with special exception
+ *
  */
 
 #include <stdio.h>

backend_shinkos6245.c

@@ -25,6 +25,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

backend_sonyupdr150.c

@@ -23,6 +23,8 @@
  *
  *          [http://www.gnu.org/licenses/gpl-3.0.html]
  *
+ *   SPDX-License-Identifier: GPL-3.0+
+ *
  */
 
 #include <stdio.h>

lib6145/libS6145ImageReProcess.c

@@ -38,6 +38,8 @@
 
           [http://www.gnu.org/licenses/gpl-3.0.html]
 
+   SPDX-License-Identifier: GPL-3.0+
+
 */
 
 //#define S6145_UNUSED

lib70x/libMitsuD70ImageReProcess.c

@@ -44,6 +44,8 @@
 
           [http://www.gnu.org/licenses/gpl-3.0.html]
 
+   SPDX-License-Identifier: GPL-3.0+
+
 */
 
 #define LIB_VERSION "0.7"

lib70x/libMitsuD70ImageReProcess.h

@@ -44,6 +44,8 @@
 
           [http://www.gnu.org/licenses/gpl-3.0.html]
 
+   SPDX-License-Identifier: GPL-3.0+
+
 */
 
 #ifndef __MITSU_D70_H