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[libav.git] / LICENSE
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1FFmpeg:
2-------
3
aae9c405 4Most files in FFmpeg are under the GNU Lesser General Public License version 2.1
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5or later (LGPL v2.1+). Read the file COPYING.LGPLv2.1 for details. Some other
6files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to
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7FFmpeg.
8
9Some optional parts of FFmpeg are licensed under the GNU General Public License
ecc1330a 10version 2 or later (GPL v2+). See the file COPYING.GPLv2 for details. None of
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11these parts are used by default, you have to explicitly pass --enable-gpl to
12configure to activate them. In this case, FFmpeg's license changes to GPL v2+.
13
14Specifically, the GPL parts of FFmpeg are
15
16- libpostproc
b2184b9c 17- some x86 optimizations in libswscale
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18- optional x86 optimizations in the files
19 libavcodec/x86/h264_deblock_sse2.asm
20 libavcodec/x86/h264_idct_sse2.asm
21 libavcodec/x86/idct_mmx.c
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22- the X11 grabber in libavdevice/x11grab.c
23
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24There are a handful of files under other licensing terms, namely:
25
26* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
27 are taken from libjpeg, see the top of the files for licensing details.
28
29
30external libraries:
31-------------------
32
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33Some external libraries, e.g. libx264, are under GPL and can be used in
34conjunction with FFmpeg. They require --enable-gpl to be passed to configure
35as well.
36
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37The nonfree external libraries libamrnb, libamrwb and libfaac can be hooked up
38in FFmpeg. You need to pass --enable-nonfree to configure to enable them. Employ
39this option with care as FFmpeg then becomes nonfree and unredistributable.
40Note that libfaac claims to be LGPL, but is not.