Libwebsockets and included programs are provided under the terms of the
MIT license shown below, with the exception that some sources are under
a similar permissive license like BSD, or are explicitly CC0 / public
domain to remove any obstacles from basing differently-licensed code on
them.

Original liberal license retained:

  - lib/misc/sha-1.c          - 3-clause BSD license retained, link to original
  - win32port/zlib            - ZLIB license (see zlib.h)
  - lib/tls/mbedtls/wrapper   - Apache 2.0 (only built if linked against mbedtls)
  - lib/misc/base64-decode.c  - already MIT

Relicensed to MIT:

  - lib/misc/daemonize.c               - relicensed from Public Domain to MIT,
                                         link to original Public Domain version
  - lib/plat/windows/windows-resolv.c  - relicensed from "Beerware v42" to MIT

Public Domain (CC-zero) to simplify reuse:

  - test-apps/*.c
  - test-apps/*.h
  - minimal-examples/*
  - lwsws/*

Although libwebsockets is available under a permissive license, it does not
change the reality of dealing with large lumps of external code... if your
copy diverges it is guaranteed to contain security problems after a while
and can be very painful to pick backports (especially since historically,
we are very hot on cleaning and refactoring the codebase).  The least
painful and lowest risk way remains sending your changes and fixes upstream
to us so you can easily use later releases and fixes.

MIT License applied to libwebsockets:

https://opensource.org/licenses/MIT 

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to
 deal in the Software without restriction, including without limitation the
 rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 sell copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 IN THE SOFTWARE.