diff --git a/asn1/RSPRO.asn b/asn1/RSPRO.asn
index 0fe3587..8587593 100644
--- a/asn1/RSPRO.asn
+++ b/asn1/RSPRO.asn
@@ -1,6 +1,24 @@
 ----------------------------------------------------------------------
 -- RSPRO - Remote SIM Protocol, part of Osmocom Remote SIM Suite
 -- (C) 2018 by Harald Welte <laforge@gnumonks.org>
+-- All Rights Reserved
+--
+-- SPDX-License-Identifier: GPL-2.0+
+--
+-- 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.,
+-- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+--
 ----------------------------------------------------------------------
 
 RSPRO {} DEFINITIONS