Add OpenSSL linking exemption to GPL license.

LICENSE

@@ -5,8 +5,23 @@ Copyright (c) 2010-2012, NORDUnet A/S.
 The radsecproxy source code is subject to two licenses, you may pick
 the one that best suits your needs.
 
+
 The radsecproxy source code is subject to the terms of the GNU General
-Public License Version 2 or later (GPL).
+Public License Version 2 or later (GPL) with the following exemption.
+
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+
 
 Alternatively the radsecproxy source code is subject to the terms of the
 below BSD style license.