The libical library is distributed under two licenses.
You may choose the terms of either:

 * The Mozilla Public License (MPL) v2.0

 or

 * The GNU Lesser General Public License (LGPL) v2.1

The vzic developer tool is licensed according to the terms of the
GNU General Public License version 2.0 or later. vzic is never
installed and is not included with binary distributions.

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Software distributed under these licenses 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.
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 Original Code is libical.

     The Initial Developer of the Original Code is Eric Busboom

     All Rights Reserved.

     Contributor(s): See individual source files.