Libical is distributed under both the LGPL and the MPL. The MPL
notice, reproduced below, covers the use of either of the licenses. 

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The contents of this file are subject to the Mozilla Public License
Version 1.1 (the "License"); you may not use this file except in
compliance with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/

Software distributed under the License is distributed on an "AS
IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing rights
and limitations under the License.

     The Original Code is libical. 

     The Initial Developer of the Original Code is Eric Busboom

     All Rights Reserved. 

     Contributor(s): See individual source files.

Alternatively, the contents of this file may be used under the terms
of the LGPL license, in which case the provisions of LGPL License are
applicable instead of those above.  If you wish to allow use of your
version of this file only under the terms of the LGPL License and not
to allow others to use your version of this file under the MPL,
indicate your decision by deleting the provisions above and replace
them with the notice and other provisions required by the LGPL
License. If you do not delete the provisions above, a recipient may
use your version of this file under either the MPL or the LGPL
License."