Clarify that our LGPL/GPL licenses come with an explicit "or later" clause.
[libav.git] / README
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1FFmpeg README
2-------------
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4745b5bf 41) Documentation
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5----------------
6
4745b5bf 7* Read the documentation in the doc/ directory.
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4745b5bf 92) Licensing
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10------------
11
a92b819a 12* Read the file COPYING.LGPL. FFmpeg and the associated libraries EXCEPT
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13 for libpostproc are licensed under the GNU Lesser General Public License
14 version 2.1 or later.
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16* libpostproc is distributed under the GNU General Public License version 2
17 or later, see the file COPYING.GPL for details. Its compilation and use in
18 FFmpeg is optional.
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19
20* libswscale contains some optional processor-specific optimizations that are
e03b4618 21 distributed under the GNU General Public License version 2 or later.
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23* The files libavcodec/x86/idct_mmx.c, libavcodec/x86/h264_deblock_sse2.asm
24 and libavcodec/x86/h264_idct_sse2.asm are distributed under the GNU General
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25 Public License version 2 or later. They are strictly optimizations and
26 their use is optional.
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78a754ce 28* The file libavcodec/ac3dec.c is distributed under the GNU General Public
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29 License version 2 or later. In order for (E-)AC-3 decoding to work you
30 need to enable GPL components.
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72b8963d 32* The file libavdevice/x11grab.c is distributed under the GNU General
e03b4618 33 Public License version 2 or later. X11 grabbing is optional.
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35* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
36 are taken from libjpeg, see the top of the files for licensing details.
37
38* The file libavcodec/fdctref.c is copyrighted by the MPEG Software Simulation
39 Group with all rights reserved. It is only used to create a DCT test program
40 and not compiled into libavcodec.
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41
42* Some external libraries are under GPL. If you wish to use them with FFmpeg,
43 you have to configure FFmpeg as GPL as well.