This program is free software; you can redistribute it and/or modify it under the terms of either:
The LGPL as published by the Free Software Foundation, version 2.1, available at: http://www.fsf.org/copyleft/lesser.html
The Mozilla Public License Version 1.0. You may obtain a copy of the License at http://www.mozilla.org/MPL/
Definition in file icalproperty_cxx.cpp.