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![Michael Niedermayer](/assets/img/avatar_default.png)
There are currently no statements from any person qualified in the art of law about the LGPL compatibility of the libfaac license and others. Furthermore their is no consensus about their compatibility amongth people not qualified in the art. Also of interrest may be that ubuntu distributes and links libfaac to LGPL code. And the ubuntu technical comittee decision about libfaac https://lists.ubuntu.com/archives/technical-board/2011-February/000703.html Comments and other viewpoints, especially if i have missed something are very welcome! Reviewed-by: Michael Bradshaw <mbradshaw@sorensonmedia.com> Reviewed-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
82 lines
3.2 KiB
Plaintext
82 lines
3.2 KiB
Plaintext
FFmpeg:
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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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- libmpcodecs
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- optional x86 optimizations in the files
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libavcodec/x86/idct_mmx.c
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- libutvideo encoding/decoding wrappers in
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libavcodec/libutvideo*.cpp
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- the X11 grabber in libavdevice/x11grab.c
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- the swresample test app in
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libswresample/swresample-test.c
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- the texi2pod.pl tool
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- the following filters in libavfilter:
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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_cropdetect.c
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- vf_delogo.c
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- vf_hqdn3d.c
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- vf_mp.c
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- vf_super2xsai.c
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- vf_tinterlace.c
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- vf_yadif.c
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- vsrc_mptestsrc.c
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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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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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external libraries
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==================
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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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--------------------
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The libcdio, libx264, libxavs and libxvid libraries are under GPL. When
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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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----------------------
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The Fraunhofer AAC library, FAAC and aacplus are under licenses which
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are incompatible with the GPLv2 and v3. We do not know for certain if their
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licenses are compatible with the LGPL.
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If you wish to enable these libraries, pass --enable-nonfree to configure.
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But note that if you enable any of these libraries the resulting binary will
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be under a complex license mix that is more restrictive than the LGPL and that
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may result in additional obligations. It is possible that these
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restrictions cause the resulting binary to be unredistributeable.
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