diff --git a/ccid_host/ccid_slot_sim.c b/ccid_host/ccid_slot_sim.c
index dc33114..c873c73 100644
--- a/ccid_host/ccid_slot_sim.c
+++ b/ccid_host/ccid_slot_sim.c
@@ -1,6 +1,23 @@
 /* Simulated CCID card slot. This is used in absence of a real hardware back-end
  * in order to test the CCID firmware codebase in a virtual environment */
 
+/* (C) 2019-2020 by Harald Welte <laforge@gnumonks.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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA
+ */
+
 #include <osmocom/core/msgb.h>
 #include <osmocom/core/timer.h>
 #include <osmocom/core/logging.h>