Espressif's Wi-Fi library, included in ChippyOS, contains code from FreeBSD's net80211. ESP-IDF 5.5.6's list of copyrights
(docs/en/COPYRIGHT.rst) names it: "FreeBSD net80211, Copyright (C) 2004-2008 Sam Leffler, Errno Consulting and licensed under
the BSD License." The copyright lines and license of FreeBSD's net80211 files of 2008 follow.

Copyright (c) 2001 Atsushi Onoe
Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
Copyright (c) 2005-2008 Sam Leffler, Errno Consulting
Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Two of those files, ieee80211_crypto_ccmp.c and ieee80211_crypto_tkip.c, also hold code from the Host AP driver, under the
GPL 2.0 or a BSD license. Its copyright line, and the paragraph of its notice that gives the BSD license:

Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi>

Alternatively, this software may be distributed under the terms of BSD
license.