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Move licensing information into a separate file called LICENSE and
rewrite it for greater clarity in the process. Originally committed as revision 18185 to svn://svn.ffmpeg.org/ffmpeg/trunk
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LICENSE
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37
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.LGPL for details. Some other files
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have a MIT/X11/BSD-style license. 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.GPL 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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- some x86 and AltiVec optimizations in libswscale
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- optional x86 optimizations in the files
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libavcodec/x86/h264_deblock_sse2.asm
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libavcodec/x86/h264_idct_sse2.asm
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libavcodec/x86/idct_mmx.c
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- the AC-3 decoder in libavcodec/ac3dec.c
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- the X11 grabber in libavdevice/x11grab.c
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Some external libraries, e.g. libx264, are under GPL and can be used in
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conjunction with FFmpeg. They require --enable-gpl to be passed to configure
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as well.
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The nonfree external libraries libamrnb and libamrwb can be hooked up in FFmpeg.
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You need to pass --enable-nonfree to configure to enable them. Employ this
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option with care as FFmpeg then beomes nonfree and unredistributable.
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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.c, libavcodec/jrevdct.c
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are taken from libjpeg, see the top of the files for licensing details.
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* The file libavcodec/fdctref.c is copyrighted by the MPEG Software Simulation
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Group with all rights reserved. It is only used to create a DCT test program
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and not compiled into libavcodec.
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33
README
33
README
@ -9,35 +9,4 @@ FFmpeg README
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2) Licensing
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------------
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* Read the file COPYING.LGPL. FFmpeg and the associated libraries EXCEPT
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for libpostproc are licensed under the GNU Lesser General Public License
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version 2.1 or later.
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* libpostproc is distributed under the GNU General Public License version 2
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or later, see the file COPYING.GPL for details. Its compilation and use in
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FFmpeg is optional.
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* libswscale contains some optional processor-specific optimizations that are
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distributed under the GNU General Public License version 2 or later.
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* The files libavcodec/x86/idct_mmx.c, libavcodec/x86/h264_deblock_sse2.asm
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and libavcodec/x86/h264_idct_sse2.asm are distributed under the GNU General
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Public License version 2 or later. They are strictly optimizations and
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their use is optional.
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* The file libavcodec/ac3dec.c is distributed under the GNU General Public
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License version 2 or later. In order for (E-)AC-3 decoding to work you
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need to enable GPL components.
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* The file libavdevice/x11grab.c is distributed under the GNU General
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Public License version 2 or later. X11 grabbing is optional.
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* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
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are taken from libjpeg, see the top of the files for licensing details.
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* The file libavcodec/fdctref.c is copyrighted by the MPEG Software Simulation
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Group with all rights reserved. It is only used to create a DCT test program
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and not compiled into libavcodec.
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* Some external libraries are under GPL. If you wish to use them with FFmpeg,
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you have to configure FFmpeg as GPL as well.
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* See the LICENSE file.
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