diff --git a/sdrsrv/device/deviceset.cpp b/sdrsrv/device/deviceset.cpp
index b7b9f2cca..4916f7ca6 100644
--- a/sdrsrv/device/deviceset.cpp
+++ b/sdrsrv/device/deviceset.cpp
@@ -4,6 +4,7 @@
 // This program is free software; you can redistribute it and/or modify          //
 // it under the terms of the GNU General Public License as published by          //
 // the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
 //                                                                               //
 // This program is distributed in the hope that it will be useful,               //
 // but WITHOUT ANY WARRANTY; without even the implied warranty of                //
diff --git a/sdrsrv/device/deviceset.h b/sdrsrv/device/deviceset.h
index e76ea7f90..3446e9318 100644
--- a/sdrsrv/device/deviceset.h
+++ b/sdrsrv/device/deviceset.h
@@ -4,6 +4,7 @@
 // This program is free software; you can redistribute it and/or modify          //
 // it under the terms of the GNU General Public License as published by          //
 // the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
 //                                                                               //
 // This program is distributed in the hope that it will be useful,               //
 // but WITHOUT ANY WARRANTY; without even the implied warranty of                //
diff --git a/sdrsrv/maincore.cpp b/sdrsrv/maincore.cpp
index 6ff00f977..9cf4b274e 100644
--- a/sdrsrv/maincore.cpp
+++ b/sdrsrv/maincore.cpp
@@ -6,6 +6,7 @@
 // This program is free software; you can redistribute it and/or modify          //
 // it under the terms of the GNU General Public License as published by          //
 // the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
 //                                                                               //
 // This program is distributed in the hope that it will be useful,               //
 // but WITHOUT ANY WARRANTY; without even the implied warranty of                //
diff --git a/sdrsrv/maincore.h b/sdrsrv/maincore.h
index ed1b665c3..ad8b77994 100644
--- a/sdrsrv/maincore.h
+++ b/sdrsrv/maincore.h
@@ -6,6 +6,7 @@
 // This program is free software; you can redistribute it and/or modify          //
 // it under the terms of the GNU General Public License as published by          //
 // the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
 //                                                                               //
 // This program is distributed in the hope that it will be useful,               //
 // but WITHOUT ANY WARRANTY; without even the implied warranty of                //
diff --git a/sdrsrv/webapi/webapiadaptersrv.cpp b/sdrsrv/webapi/webapiadaptersrv.cpp
index 3f00b1371..4c6ad4dfe 100644
--- a/sdrsrv/webapi/webapiadaptersrv.cpp
+++ b/sdrsrv/webapi/webapiadaptersrv.cpp
@@ -6,6 +6,7 @@
 // This program is free software; you can redistribute it and/or modify          //
 // it under the terms of the GNU General Public License as published by          //
 // the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
 //                                                                               //
 // This program is distributed in the hope that it will be useful,               //
 // but WITHOUT ANY WARRANTY; without even the implied warranty of                //
diff --git a/sdrsrv/webapi/webapiadaptersrv.h b/sdrsrv/webapi/webapiadaptersrv.h
index 79f2a27b7..de49aa023 100644
--- a/sdrsrv/webapi/webapiadaptersrv.h
+++ b/sdrsrv/webapi/webapiadaptersrv.h
@@ -6,6 +6,7 @@
 // This program is free software; you can redistribute it and/or modify          //
 // it under the terms of the GNU General Public License as published by          //
 // the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
 //                                                                               //
 // This program is distributed in the hope that it will be useful,               //
 // but WITHOUT ANY WARRANTY; without even the implied warranty of                //