138 lines
6.8 KiB
Markdown
138 lines
6.8 KiB
Markdown
# LICENSE
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SRS used some third party libraries, which are distributed using their own licenses.
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This wiki describes the licenses about SRS and related libraries.
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**I am not a lawyer and this is not legal advice!**
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## SRS
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**SRS v1/v2/v3/v4/v5**
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`SRS v1/v2/v3` uses [MIT](https://github.com/ossrs/srs/blob/develop/LICENSE) license that is very liberal.
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`SRS v4`(and later) [use SPDX-License-Identifier: MIT](https://github.com/ossrs/srs/commit/3cd22b6e6eaf0c64834bfbcf1182270153850ad1),
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to make it more simple, by following the specification of [SPDX](https://spdx.org/ids/), which is also used by
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[POCO](https://github.com/pocoproject/poco/blob/master/LICENSE) and [Linux Kernel](https://www.kernel.org/doc/html/latest/process/license-rules.html#license-identifier-syntax), etc.
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`SRS v5+` uses the [MIT](https://github.com/ossrs/srs/blob/develop/LICENSE) license.
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## Library
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The following dependent libraries can be linked by SRS as either static or dynamic libraries.
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### State Threads
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The State Threads library is a derivative of the Netscape Portable Runtime library (NSPR) and therefore is distributed
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under the Mozilla Public License (MPL) version 1.1 or the GNU General Public License (GPL) version 2 or later.
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You can choose which of the two licenses you want or you can continue the dual license.
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`Commercial interests probably will choose the MPL`, and free software advocates likely will prefer the GPL.
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For more information, please read [LICENSE](http://state-threads.sourceforge.net/license.html) of ST.
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[ST(State Threads)](https://github.com/ossrs/state-threads) is forked from [SourceForge](https://sourceforge.net/projects/state-threads/)
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and SRS uses the [patched ST](https://github.com/ossrs/state-threads/tree/srs). ST uses [GPLv2](https://github.com/ossrs/state-threads/blob/st-1.9/public.h#L25)
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or [MPL](https://github.com/ossrs/state-threads/blob/st-1.9/public.h#L2). Well, MPL is nice for commercial products,
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please read [#907](https://github.com/ossrs/srs/issues/907).
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### OpenSSL
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OpenSSL(May be used for SSL/TLS support) Uses an Original BSD-style license with an announcement clause that makes
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it "incompatible" with GPL. You are not allowed to ship binaries that link with OpenSSL that includes GPL code
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(unless that specific GPL code includes an exception for OpenSSL - a habit that is growing more and more common).
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If OpenSSL's licensing is a problem for you, consider using another TLS library.
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> Remark: SRS can be built with system ssl library `libssl.so` and `libcrypto.so` by `./configure --use-sys-ssl`.
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### SRT
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**SRS4**
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[libsrt](https://github.com/Haivision/srt/blob/master/LICENSE) use MPL 2.0, please read [#1147](https://github.com/ossrs/srs/issues/1147).
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> For SRS to use shared library libsrt.so, please use `./configure --srt=on --shared-srt=on`, please see [f44224a](https://github.com/ossrs/srs/commit/f44224a2a121bb305868b7c00188bf0fcf8fce72).
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### FFmpeg
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**SRS4**
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[FFmpeg](https://www.ffmpeg.org/legal.html) use LGPL, and GPL if configure with `--enable-gpl`.
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SRS supports `./configure --ffmpeg-fit=on --shared-ffmpeg=on` to build and link in so, see
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[d526672](https://github.com/ossrs/srs/commit/d5266725e2e40fd23bf3cbb4af814f392e161304) and [#1762](https://github.com/ossrs/srs/issues/1762#issuecomment-912897342).
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* [Opus](https://opus-codec.org/license/) uses BSD, to transcode RTC(opus) to Live(aac).
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### SRTP
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The [libsrtp](https://github.com/cisco/libsrtp) library uses a [3-clause BSD](https://chromium.googlesource.com/chromium/deps/libsrtp/+/refs/heads/main/README.chromium)
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license, which you can view in the [LICENSE](https://github.com/cisco/libsrtp/blob/main/LICENSE) file.
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For SRS 5+ uses the command `./configure --shared-srtp=on` to enable linking with the libsrtp shared library.
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## Embeded in Code
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The following dependent libraries are directly embedded in the SRS project using code.
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### http-parser
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[http-parser](https://github.com/nodejs/http-parser) is part of NGINX, that uses [2-clause BSD-like license](http://nginx.org/LICENSE).
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### JSON
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**SRS2**
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[NXJSON](https://bitbucket.org/yarosla/nxjson) uses [LGPL](https://bitbucket.org/yarosla/nxjson/src/afaf7f999a95ed68620d11073291dc82df792627/nxjson.h?at=default&fileviewer=file-view-default#nxjson.h-16) LICENSE.
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SRS2 depends on NXJSON. SRS3 has replaced NXJSON with [json-parser](https://github.com/ossrs/srs/issues/904) which
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uses BSD license.
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**SRS3+**
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The JSON library [json-parser](https://github.com/udp/json-parser) uses [BSD 2-clause "Simplified" License](https://github.com/udp/json-parser/blob/master/LICENSE).
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SRS3+ uses json-parser, read [#904](https://github.com/ossrs/srs/issues/904).
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### LIBUUID
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The [libuuid](https://sourceforge.net/p/libuuid/code/ci/master/tree/COPYING) is BSD-3 LICENSE.
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See [SRS2](https://github.com/ossrs/srs/commit/c8871413e4c5ed72abfad3ff9523c0b0d1a6bb50),
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[SRS3](https://github.com/ossrs/srs/commit/5c6bb63bf25b500a2f785e087befbea7cf58a0d8),
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[SRS4+](https://github.com/ossrs/srs/commit/48ef3dcd832cc5ce34f97c26d81c3ed03e4cebd8).
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## Not Used in Code
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The libraries below are either used by forking processes, unused, or were previously used but have now
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been removed or replaced.
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### Utility
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SRS forks FFMPEG process to transcode or ingest, however user can use other encoders.
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**SRS2**
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SRS2 uses the following functions, which have license problems and have been replaced in SRS3+:
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1. `ff_hex_to_data`: For RTSP to parse the hex string. SRS3 replaced by golang hex at [41c6e833](https://github.com/ossrs/srs/commit/41c6e833b99829be4929f5bc90f83a237ccf7c33) and [#917](https://github.com/ossrs/srs/issues/917#issuecomment-406856975).
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1. `srs_av_base64_decode`: For RTSP to parse the base64 by FFMPEG. SRS3 replaced by golang base64 at [84f81983](https://github.com/ossrs/srs/commit/84f81983aa609d2027e290c808280428a4e69f0e) and [#917](https://github.com/ossrs/srs/issues/917#issuecomment-406854293).
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1. `srs_crc32_mpegts`: For TS to build the crc32 checksum by FFMPEG. SRS3 replaced by pycrc at [0a63448](https://github.com/ossrs/srs/commit/0a63448b86bfa2998f14055402896406a33de109) and [#917](https://github.com/ossrs/srs/issues/917#issuecomment-406839996).
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1. `srs_crc32_ieee`: For kafka to build the crc32 checksum. SRS3 replaced by pycrc code at [0a63448](https://github.com/ossrs/srs/commit/0a63448b86bfa2998f14055402896406a33de109) and [#917](https://github.com/ossrs/srs/issues/917#issuecomment-406795463).
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Please read [#917](https://github.com/ossrs/srs/issues/917).
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### USRSCTP
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**SRS4**
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The [usrsctp](https://github.com/sctplab/usrsctp) is [BSD-3-Clause](https://github.com/sctplab/usrsctp/blob/master/LICENSE.md),
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for WebRTC DataChannel, [#1809](https://github.com/ossrs/srs/pull/1809).
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> Note: Currently, it has not been merged into the SRS code and is still in the feature branch state.
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Please read [srs-sctp](https://github.com/ossrs/srs-sctp).
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