Copyrights and Licenses
***********************

:link_to_translation:`zh_CN:[中文]`

Software Copyrights
===================

All original source code in this repository is Copyright (C) 2015-2026
Espressif Systems. This source code is licensed under the ESPRESSIF MIT
License as described in the file LICENSE.

Additional third party copyrighted code is included under the following licenses:

* `mp3`_ library is Copyright (c) 2005-2008, The Android Open Source Project, and is licensed under the Apache License Version 2.0.

* `aac`_ library is Copyright (c) 2005-2008, The Android Open Source Project, and is licensed under the Apache License Version 2.0.

* `amr`_ library is Copyright (C) 2009 Martin Storsjo and is licensed under the Apache License Version 2.0.

* `opus`_ library, Copyright 2001-2011 Xiph.Org, Skype Limited, Octasic,Jean-Marc Valin, Timothy B. Terriberry, CSIRO, Gregory Maxwell, Mark Borgerding, Erik de Castro Lopo, is licensed under 3-clause BSD license.

* `flac`_ library, Copyright (C) 2011-2016  Xiph.Org Foundation, is licensed under Xiph.Org's BSD-like license.

* `vorbis`_ library, Copyright (c) 2002-2020 Xiph.org Foundation, is licensed under the 3-Clause BSD license.

* `aac-enc`_ library is Copyright 2003-2010, VisualOn, and is licensed under the Apache License Version 2.0.

* `adpcm`_ library is Copyright (C) 2020 aikiriao <samuraiaiki@gmail.com>.

* `jpeg-dec`_ library is Copyright (C) 2019, ChaN. 

* `alac`_ library is Copyright (C) 2004, developed by Apple, and is licensed under the Apache License Version 2.0.

Please refer to the `COPYRIGHT <http://esp-idf.readthedocs.io/en/latest/COPYRIGHT.html>`_ in ESP-IDF Programming Guide

Where source code headers specify Copyright & License information, this information takes precedence over the summaries made here.


.. _mp3: https://github.com/aosp-mirror/platform_external_opencore/tree/master/codecs_v2/audio/mp3/dec
.. _aac: https://github.com/aosp-mirror/platform_external_opencore/tree/master/codecs_v2/audio/aac/dec
.. _amr: https://github.com/aosp-mirror/platform_external_opencore/tree/master/codecs_v2/audio/gsm_amr
.. _opus: https://github.com/xiph/opus
.. _flac: https://github.com/xiph/flac
.. _vorbis: https://github.com/xiph/vorbis
.. _aac-enc: https://github.com/mstorsjo/vo-aacenc
.. _adpcm: https://github.com/aikiriao/IMA-ADPCM
.. _jpeg-dec: http://www.elm-chan.org/fsw/tjpgd/00index.html
.. _alac: https://github.com/macosforge/alac
