Move licensing information into a separate file called LICENSE and
[libav.git] / LICENSE
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1Most files in FFmpeg are under the GNU Lesser General Public License version 2.1
2or later (LGPL v2.1+). Read the file COPYING.LGPL for details. Some other files
3have a MIT/X11/BSD-style license. In combination the LGPL v2.1+ applies to
4FFmpeg.
5
6Some optional parts of FFmpeg are licensed under the GNU General Public License
7version 2 or later (GPL v2+). See the file COPYING.GPL for details. None of
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
14- some x86 and AltiVec optimizations in libswscale
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
19- the AC-3 decoder in libavcodec/ac3dec.c
20- the X11 grabber in libavdevice/x11grab.c
21
22Some external libraries, e.g. libx264, are under GPL and can be used in
23conjunction with FFmpeg. They require --enable-gpl to be passed to configure
24as well.
25
26The nonfree external libraries libamrnb and libamrwb can be hooked up in FFmpeg.
27You need to pass --enable-nonfree to configure to enable them. Employ this
28option with care as FFmpeg then beomes nonfree and unredistributable.
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.
34
35* The file libavcodec/fdctref.c is copyrighted by the MPEG Software Simulation
36 Group with all rights reserved. It is only used to create a DCT test program
37 and not compiled into libavcodec.