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Libical is an Open Source implementation of the iCalendar protocols and protocol data units.

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Libical — an implementation of iCalendar protocols and data formats

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About

Libical — an implementation of iCalendar protocols and data formats

Most of the code in here was written by Eric Busboom at the end of the last millennium with help from dozens of contributors. It is currently maintained by Allen Winter and the libical team at https://github.com/libical/libical.

Libical is an Open Source implementation of the iCalendar protocols and protocol data units. The iCalendar specification describes how calendar clients can communicate with calendar servers so users can store their calendar data and arrange meetings with other users.

Libical implements RFC5545, RFC5546, RFC7529; the CalDav scheduling extensions in RFC6638; iCalendar extensions in RFC7986, RFC9073, RFC9074; plus the iCalendar iMIP protocol in RFC6047.

License

The code and datafiles in this distribution are licensed under the Mozilla Public License (MPL) v2.0. See https://www.mozilla.org/MPL for a copy of this license.

Alternately, you may use libical under the terms of the GNU Lesser General Public License (LGPL) v2.1. See https://www.gnu.org/licenses/lgpl-2.1.txt for a copy of this license.

This dual license ensures that the library can be incorporated into both proprietary code and GPL'd programs, and will benefit from improvements made by programmers in both realms. We (the libical developers) will only accept changes to this library if they are similarly dual-licensed.

Building

See the top-level Install.txt file.

Documentation

Documentation is hosted at https://libical.github.io/libical/apidocs/.

For a conceptual overview of the library, see [UsingLibical.md](@ref UsingLibical). There is other rudimentary, unfinished documentation in the doc/ directory of the source distribution, and annotated examples in examples/ and the test code in src/test/.

Additionally, progress is underway to add API documentation, which is available at the apidocs site.

Acknowledgments

Portions of this distribution are (C) Copyright 1996 Apple Computer, Inc., AT&T Corp., International Business Machines Corporation and Siemens Rolm Communications Inc. See src/libicalvcal/README.TXT for details.

Libical Users

In no particular order:

Get Involved

Subscribe to our mailing lists:

For developer discussions https://lists.infradead.org/mailman/listinfo/libical-devel

For general discussions about libical and related projects https://lists.infradead.org/mailman/listinfo/libical-interest

Report bugs to our issue tracker at https://github.com/libical/libical/issues

About

Libical is an Open Source implementation of the iCalendar protocols and protocol data units.

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