diff --git a/cmd/server/fetch.go b/cmd/server/fetch.go
index 239f177..801a0bb 100644
--- a/cmd/server/fetch.go
+++ b/cmd/server/fetch.go
@@ -1,3 +1,20 @@
+/*
+   Microsub server
+   Copyright (C) 2018  Peter Stuifzand
+
+   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.
+
+   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/>.
+*/
 package main
 
 import (
diff --git a/cmd/server/main.go b/cmd/server/main.go
index 176237c..9f1cb6c 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -1,3 +1,20 @@
+/*
+   Microsub server
+   Copyright (C) 2018  Peter Stuifzand
+
+   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.
+
+   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/>.
+*/
 package main
 
 import (
diff --git a/cmd/server/memory.go b/cmd/server/memory.go
index a642daa..6b7e145 100644
--- a/cmd/server/memory.go
+++ b/cmd/server/memory.go
@@ -1,3 +1,20 @@
+/*
+   Microsub server
+   Copyright (C) 2018  Peter Stuifzand
+
+   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.
+
+   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/>.
+*/
 package main
 
 import (
diff --git a/cmd/server/null.go b/cmd/server/null.go
index 1199d73..4d8bc46 100644
--- a/cmd/server/null.go
+++ b/cmd/server/null.go
@@ -1,3 +1,20 @@
+/*
+   Microsub server
+   Copyright (C) 2018  Peter Stuifzand
+
+   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.
+
+   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/>.
+*/
 package main
 
 import (
diff --git a/microsub/protocol.go b/microsub/protocol.go
index 3c1c4de..5113c8e 100644
--- a/microsub/protocol.go
+++ b/microsub/protocol.go
@@ -1,3 +1,20 @@
+/*
+   Microsub server
+   Copyright (C) 2018  Peter Stuifzand
+
+   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.
+
+   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/>.
+*/
 package microsub
 
 /*