NOTICE

ffmpeg.wasm
Copyright (C) 2019 Jerome Wu and contributors
Copyright (C) 2024 Project516 and contributors

This project is licensed as a whole under the GNU Affero General Public
License, version 3 or later (AGPL-3.0-or-later). See LICENSE at the
repository root for the full license text.

Project516/ffmpeg.wasm is a fork of ffmpegwasm/ffmpeg.wasm, which was
originally released under the MIT license by Jerome Wu and contributors. That
MIT notice is kept, unmodified, at LICENSES/MIT-ffmpegwasm.txt, as required by
the MIT license's own terms. Relicensing the wrapper code to AGPL-3.0-or-later
is permitted because MIT allows sublicensing and relicensing of derivative
works, provided the original copyright notice and license text travel with
the distribution; that is what LICENSES/MIT-ffmpegwasm.txt is for.

Why the core packages are AGPL-3.0-or-later
--------------------------------------------

@project516/ffmpeg-wasm-core and @project516/ffmpeg-wasm-core-mt embed FFmpeg
built with --enable-gpl, plus the third-party libraries listed below. FFmpeg's
own project states that building with --enable-gpl changes its effective
license from LGPL-2.1-or-later to GPL-2.0-or-later (https://ffmpeg.org/legal.html).
Every GPL-licensed library this project links in is licensed "or later," not
GPLv2-only, so combining them with this project's AGPL-3.0-or-later code is
permitted: GPLv3 section 13 and AGPLv3 section 13 each grant explicit
permission to combine a covered work with code licensed under the other, and a
work licensed "GPL-2.0-or-later" already carries permission to be used under
GPLv3 terms. The wasm binaries in the core packages are therefore distributed
as a whole under AGPL-3.0-or-later.

FFmpeg is never configured with --enable-nonfree, and no library with a
GPL-incompatible license (such as fdk-aac) is linked in, so the core binaries
are redistributable.

Corresponding source
---------------------

- This repository is the corresponding source for this project's own code
  (the TypeScript wrapper, the build scripts, and the JS glue in src/bind).
- FFmpeg and each third-party library below are built from the pinned
  versions and upstream URLs in Dockerfile and build/*.sh in this repository.
  Their own corresponding source is each project's own upstream repository at
  the tag or commit pinned there.

FFmpeg and third-party libraries built into the core packages
---------------------------------------------------------------

FFmpeg
  https://ffmpeg.org
  License: LGPL-2.1-or-later; GPL-2.0-or-later when built with --enable-gpl
  (this project's build). Versions used: n5.1.10 (single-thread core),
  n9.0.2 (multi-thread core). See Dockerfile.

x264
  https://www.videolan.org/developers/x264.html
  License: GPL-2.0-or-later

x265
  https://bitbucket.org/multicoreware/x265_git
  License: GPL-2.0-or-later

libvpx
  https://chromium.googlesource.com/webm/libvpx
  License: BSD-3-Clause

LAME
  https://lame.sourceforge.io
  License: LGPL-2.0-or-later

libogg
  https://www.xiph.org/ogg
  License: BSD-3-Clause

libtheora
  https://www.theora.org
  License: BSD-3-Clause

libvorbis
  https://www.xiph.org/vorbis
  License: BSD-3-Clause

Opus
  https://opus-codec.org
  License: BSD-3-Clause

zlib
  https://zlib.net
  License: zlib License

libwebp
  https://chromium.googlesource.com/webm/libwebp
  License: BSD-3-Clause

FreeType
  https://freetype.org
  License: FreeType License (FTL), a permissive license; FreeType also offers
  GPL-2.0-or-later as an alternative, this project uses the FTL option.

FriBidi
  https://github.com/fribidi/fribidi
  License: LGPL-2.1-or-later

HarfBuzz
  https://harfbuzz.github.io
  License: Old MIT License (permissive)

libass
  https://github.com/libass/libass
  License: ISC License

zimg
  https://github.com/sekrit-twc/zimg
  License: WTFPL

Exact pinned versions and download locations for all of the above are in
Dockerfile and build/*.sh in this repository.

wasmpeg
  https://github.com/wasmpeg/wasmpeg
  License: LGPL-2.1-or-later

wasmpeg is credited here as design inspiration only (see issue #49). No code
from wasmpeg has been copied into this project. If code from wasmpeg is
adapted in the future, its LGPL notices will be preserved and this NOTICE
will be updated to reflect that.