diff --git a/vault.c b/vault.c
index 91a32c7..62d7606 100644
--- a/vault.c
+++ b/vault.c
@@ -1,3 +1,26 @@
+/*
+	luksrku - Tool to remotely unlock LUKS disks using TLS.
+	Copyright (C) 2016-2019 Johannes Bauer
+
+	This file is part of luksrku.
+
+	luksrku 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; this program is ONLY licensed under
+	version 3 of the License, later versions are explicitly excluded.
+
+	luksrku 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 luksrku; if not, write to the Free Software
+	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+	Johannes Bauer <JohannesBauer@gmx.de>
+*/
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/vault.h b/vault.h
index f93bf07..af2bf94 100644
--- a/vault.h
+++ b/vault.h
@@ -1,3 +1,26 @@
+/*
+	luksrku - Tool to remotely unlock LUKS disks using TLS.
+	Copyright (C) 2016-2019 Johannes Bauer
+
+	This file is part of luksrku.
+
+	luksrku 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; this program is ONLY licensed under
+	version 3 of the License, later versions are explicitly excluded.
+
+	luksrku 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 luksrku; if not, write to the Free Software
+	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+	Johannes Bauer <JohannesBauer@gmx.de>
+*/
+
 #ifndef __VAULT_H__
 #define __VAULT_H__