diff --git a/LICENSE b/LICENSE
index 94a9ed0..8baaf9c 100644
--- a/LICENSE
+++ b/LICENSE
@@ -569,10 +569,9 @@ address new problems or concerns.
 
   Each version is given a distinguishing version number.  If the
 Program specifies that a certain numbered version of the GNU General
-Public License "or any later version" applies to it, you have the
+Public License applies to it, you have the
 option of following the terms and conditions either of that numbered
-version or of any later version published by the Free Software
-Foundation.  If the Program does not specify a version number of the
+version.  If the Program does not specify a version number of the
 GNU General Public License, you may choose any version ever published
 by the Free Software Foundation.
 
@@ -636,8 +635,7 @@ the "copyright" line and a pointer to where the full notice is found.
 
     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 3 of the License, or
-    (at your option) any later version.
+    the Free Software Foundation, either version 3 of the License.
 
     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/src/classes/Keyboard.cpp b/src/classes/Keyboard.cpp
index c342262..52d9af5 100644
--- a/src/classes/Keyboard.cpp
+++ b/src/classes/Keyboard.cpp
@@ -1,3 +1,19 @@
+/*
+  This file is part of g810-led.
+
+  g810-led 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 of the License.
+
+  g810-led 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 g810-led.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "Keyboard.h"
 
 #include <iostream>
diff --git a/src/classes/Keyboard.h b/src/classes/Keyboard.h
index ea2521e..c74dc17 100644
--- a/src/classes/Keyboard.h
+++ b/src/classes/Keyboard.h
@@ -1,3 +1,19 @@
+/*
+  This file is part of g810-led.
+
+  g810-led 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 of the License.
+
+  g810-led 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 g810-led.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #ifndef KEYBOARD_CLASS
 #define KEYBOARD_CLASS
 
diff --git a/src/helpers/help.cpp b/src/helpers/help.cpp
index 850442d..952d2ea 100644
--- a/src/helpers/help.cpp
+++ b/src/helpers/help.cpp
@@ -1,3 +1,19 @@
+/*
+  This file is part of g810-led.
+
+  g810-led 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 of the License.
+
+  g810-led 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 g810-led.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "help.h"
 
 #include <iostream>
diff --git a/src/helpers/help.h b/src/helpers/help.h
index 08dbcf2..fa96ef4 100644
--- a/src/helpers/help.h
+++ b/src/helpers/help.h
@@ -1,3 +1,19 @@
+/*
+  This file is part of g810-led.
+
+  g810-led 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 of the License.
+
+  g810-led 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 g810-led.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #ifndef HELP_HELPER
 #define HELP_HELPER
 
diff --git a/src/helpers/utils.cpp b/src/helpers/utils.cpp
index 5dd6dea..e961d79 100644
--- a/src/helpers/utils.cpp
+++ b/src/helpers/utils.cpp
@@ -1,3 +1,19 @@
+/*
+  This file is part of g810-led.
+
+  g810-led 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 of the License.
+
+  g810-led 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 g810-led.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "utils.h"
 
 #include <iostream>
diff --git a/src/helpers/utils.h b/src/helpers/utils.h
index 863d0bf..c496404 100644
--- a/src/helpers/utils.h
+++ b/src/helpers/utils.h
@@ -1,3 +1,19 @@
+/*
+  This file is part of g810-led.
+
+  g810-led 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 of the License.
+
+  g810-led 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 g810-led.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #ifndef UTILS_HELPER
 #define UTILS_HELPER
 
diff --git a/src/main.cpp b/src/main.cpp
index 0bb88d7..4236823 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,3 +1,19 @@
+/*
+  This file is part of g810-led.
+
+  g810-led 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 of the License.
+
+  g810-led 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 g810-led.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include <iomanip>
 #include <iostream>
 #include <unistd.h>