Chapter 9
Copyrights and Licenses
9.1 Software Copyrights
All original source code in this repository is Copyright (C) 2015-2021 Espressif Systems. This source code is licensed
under the Apache License 2.0 as described in the file LICENSE.
Additional third party copyrighted code is included under the following licenses.
Where source code headers specify Copyright & License information, this information takes precedence over the
summaries made here.
9.1.1 Firmware Components
These third party libraries can be included into the application (firmware) produced by ESP-IDF.
• Newlib is licensed under the BSD License and is Copyright of various parties, as described in COPY-
ING.NEWLIB.
• Xtensa header files are Copyright (C) 2013 Tensilica Inc and are licensed under the MIT License as reproduced
in the individual header files.
• Original parts of FreeRTOS (components/freertos) are Copyright (C) 2017 Amazon.com, Inc. or its affiliates
are licensed under the MIT License, as described in license.txt.
• Original parts of LWIP (components/lwip) are Copyright (C) 2001, 2002 Swedish Institute of Computer Sci-
ence and are licensed under the BSD License as described in COPYING file.
• wpa_supplicant Copyright (c) 2003-2005 Jouni Malinen and licensed under the BSD license.
• FreeBSD net80211 Copyright (c) 2004-2008 Sam Leffler, Errno Consulting and licensed under the BSD li-
cense.
• JSMN JSON Parser (components/jsmn) Copyright (c) 2010 Serge A. Zaitsev and licensed under the MIT
license.
• argtable3 argument parsing library Copyright (C) 1998-2001,2003-2011,2013 Stewart Heitmann and licensed
under 3-clause BSD license.
• linenoise line editing library Copyright (c) 2010-2014 Salvatore Sanfilippo, Copyright (c) 2010-2013 Pieter
Noordhuis, licensed under 2-clause BSD license.
• libcoap COAP library Copyright (c) 2010-2017 Olaf Bergmann and others, is licensed under 2-clause BSD
license as described in LICENSE file and COPYING file .
• libexpat XML parsing library Copyright (c) 1998-2000 Thai Open Source Software Center Ltd and Clark
Cooper, Copyright (c) 2001-2017 Expat maintainers, is licensed under MIT license as described in COPYING
file .
• FatFS library, Copyright (C) 2017 ChaN, is licensed under a BSD-style license .
• cJSON library, Copyright (c) 2009-2017 Dave Gamble and cJSON contributors, is licensed under MIT license
as described in LICENSE file .
• libsodium library, Copyright (c) 2013-2018 Frank Denis, is licensed under ISC license as described in LI-
CENSE file .
• micro-ecc library, Copyright (c) 2014 Kenneth MacKay, is licensed under 2-clause BSD license.
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