diff --git a/src/libsync/clientsideencryption.cpp b/src/libsync/clientsideencryption.cpp
index 4283f8e2cee66..561e896885151 100644
--- a/src/libsync/clientsideencryption.cpp
+++ b/src/libsync/clientsideencryption.cpp
@@ -1,3 +1,18 @@
+/*
+ * Copyright © 2017, Tomaz Canabrava <tcanabrava@kde.org>
+ * Copyright © 2020, Andreas Jellinghaus <andreas@ionisiert.de>
+ *
+ * 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 2 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.
+ */
+
 #include "clientsideencryption.h"
 
 #include "account.h"
diff --git a/src/libsync/clientsideencryption.h b/src/libsync/clientsideencryption.h
index 2726cda1d7b3d..cc6b964e4e85b 100644
--- a/src/libsync/clientsideencryption.h
+++ b/src/libsync/clientsideencryption.h
@@ -1,3 +1,17 @@
+/*
+ * Copyright © 2017, Tomaz Canabrava <tcanabrava@kde.org>
+ *
+ * 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 2 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.
+ */
+
 #ifndef CLIENTSIDEENCRYPTION_H
 #define CLIENTSIDEENCRYPTION_H