Rename COPYING.GPL --> COPYING.GPLv2 and COPYING.LGPL --> COPYING.LGPLv2.1.
[libav.git] / LICENSE
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aae9c405 1Most files in FFmpeg are under the GNU Lesser General Public License version 2.1
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2or later (LGPL v2.1+). Read the file COPYING.LGPLv2.1 for details. Some other
3files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to
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4FFmpeg.
5
6Some optional parts of FFmpeg are licensed under the GNU General Public License
ecc1330a 7version 2 or later (GPL v2+). See the file COPYING.GPLv2 for details. None of
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8these parts are used by default, you have to explicitly pass --enable-gpl to
9configure to activate them. In this case, FFmpeg's license changes to GPL v2+.
10
11Specifically, the GPL parts of FFmpeg are
12
13- libpostproc
b2184b9c 14- some x86 optimizations in libswscale
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15- optional x86 optimizations in the files
16 libavcodec/x86/h264_deblock_sse2.asm
17 libavcodec/x86/h264_idct_sse2.asm
18 libavcodec/x86/idct_mmx.c
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19- the X11 grabber in libavdevice/x11grab.c
20
21Some external libraries, e.g. libx264, are under GPL and can be used in
22conjunction with FFmpeg. They require --enable-gpl to be passed to configure
23as well.
24
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25The nonfree external libraries libamrnb, libamrwb and libfaac can be hooked up
26in FFmpeg. You need to pass --enable-nonfree to configure to enable them. Employ
27this option with care as FFmpeg then becomes nonfree and unredistributable.
28Note that libfaac claims to be LGPL, but is not.
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29
30There are a handful of files under other licensing terms, namely:
31
32* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
33 are taken from libjpeg, see the top of the files for licensing details.