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https://github.com/FFmpeg/FFmpeg.git
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dc0f711459
There is really no need for two aac wrappers, we already have libfdk-aac which is better. Not to mention that faac doesn't even support HEv1, or HEv2. It's also under a license which is unusable for distribution, so it would only be useful to people who will compile their own ffmpeg, only use it themselves (which at that point should just use fdk-aac). Signed-off-by: Josh de Kock <josh@itanimul.li>
123 lines
4.3 KiB
Markdown
123 lines
4.3 KiB
Markdown
# License
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Most files in FFmpeg are under the GNU Lesser General Public License version 2.1
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or later (LGPL v2.1+). Read the file `COPYING.LGPLv2.1` for details. Some other
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files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to
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FFmpeg.
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Some optional parts of FFmpeg are licensed under the GNU General Public License
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version 2 or later (GPL v2+). See the file `COPYING.GPLv2` for details. None of
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these parts are used by default, you have to explicitly pass `--enable-gpl` to
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configure to activate them. In this case, FFmpeg's license changes to GPL v2+.
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Specifically, the GPL parts of FFmpeg are:
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- libpostproc
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- optional x86 optimization in the files
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- `libavcodec/x86/flac_dsp_gpl.asm`
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- `libavcodec/x86/idct_mmx.c`
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- `libavfilter/x86/vf_removegrain.asm`
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- the X11 grabber in `libavdevice/x11grab.c`
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- the following building and testing tools
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- `compat/solaris/make_sunver.pl`
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- `doc/t2h.pm`
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- `doc/texi2pod.pl`
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- `libswresample/swresample-test.c`
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- `tests/checkasm/*`
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- `tests/tiny_ssim.c`
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- the following filters in libavfilter:
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- `f_ebur128.c`
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- `vf_blackframe.c`
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- `vf_boxblur.c`
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- `vf_colormatrix.c`
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- `vf_cover_rect.c`
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- `vf_cropdetect.c`
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- `vf_delogo.c`
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- `vf_eq.c`
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- `vf_find_rect.c`
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- `vf_fspp.c`
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- `vf_geq.c`
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- `vf_histeq.c`
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- `vf_hqdn3d.c`
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- `vf_interlace.c`
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- `vf_kerndeint.c`
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- `vf_mcdeint.c`
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- `vf_mpdecimate.c`
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- `vf_owdenoise.c`
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- `vf_perspective.c`
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- `vf_phase.c`
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- `vf_pp.c`
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- `vf_pp7.c`
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- `vf_pullup.c`
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- `vf_repeatfields.c`
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- `vf_sab.c`
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- `vf_smartblur.c`
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- `vf_spp.c`
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- `vf_stereo3d.c`
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- `vf_super2xsai.c`
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- `vf_tinterlace.c`
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- `vf_uspp.c`
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- `vsrc_mptestsrc.c`
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Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then
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the configure parameter `--enable-version3` will activate this licensing option
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for you. Read the file `COPYING.LGPLv3` or, if you have enabled GPL parts,
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`COPYING.GPLv3` to learn the exact legal terms that apply in this case.
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There are a handful of files under other licensing terms, namely:
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* The files `libavcodec/jfdctfst.c`, `libavcodec/jfdctint_template.c` and
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`libavcodec/jrevdct.c` are taken from libjpeg, see the top of the files for
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licensing details. Specifically note that you must credit the IJG in the
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documentation accompanying your program if you only distribute executables.
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You must also indicate any changes including additions and deletions to
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those three files in the documentation.
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* `tests/reference.pnm` is under the expat license.
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## External libraries
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FFmpeg can be combined with a number of external libraries, which sometimes
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affect the licensing of binaries resulting from the combination.
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### Compatible libraries
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The following libraries are under GPL:
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- frei0r
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- libcdio
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- librubberband
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- libvidstab
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- libx264
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- libx265
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- libxavs
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- libxvid
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When combining them with FFmpeg, FFmpeg needs to be licensed as GPL as well by
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passing `--enable-gpl` to configure.
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The OpenCORE and VisualOn libraries are under the Apache License 2.0. That
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license is incompatible with the LGPL v2.1 and the GPL v2, but not with
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version 3 of those licenses. So to combine these libraries with FFmpeg, the
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license version needs to be upgraded by passing `--enable-version3` to configure.
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### Incompatible libraries
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There are certain libraries you can combine with FFmpeg whose licenses are not
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compatible with the GPL and/or the LGPL. If you wish to enable these
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libraries, even in circumstances that their license may be incompatible, pass
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`--enable-nonfree` to configure. But note that if you enable any of these
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libraries the resulting binary will be under a complex license mix that is
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more restrictive than the LGPL and that may result in additional obligations.
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It is possible that these restrictions cause the resulting binary to be
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unredistributable.
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The Fraunhofer FDK AAC and OpenSSL libraries are under licenses which are
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incompatible with the GPLv2 and v3. To the best of our knowledge, they are
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compatible with the LGPL.
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The NVENC library, while its header file is licensed under the compatible MIT
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license, requires a proprietary binary blob at run time, and is deemed to be
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incompatible with the GPL. We are not certain if it is compatible with the
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LGPL, but we require `--enable-nonfree` even with LGPL configurations in case
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it is not.
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