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 - cmake/FindGit.cmake - 3D Slicer Contribution and Software License Agreement 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. 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