update file headers with license information (SPDX)
diff --git a/examples/rfc2217_server.py b/examples/rfc2217_server.py
index 886925a..fb89627 100755
--- a/examples/rfc2217_server.py
+++ b/examples/rfc2217_server.py
@@ -1,9 +1,11 @@
#!/usr/bin/env python
-
-# (C) 2009 Chris Liechti <cliechti@gmx.net>
+#
# redirect data from a TCP/IP connection to a serial port and vice versa
# using RFC 2217
-
+#
+# (C) 2009 Chris Liechti <cliechti@gmx.net>
+#
+# SPDX-License-Identifier: BSD-3-Clause
import logging
import os