Imported Debian version 2.5.1~trusty
[deb_ffmpeg.git] / ffmpeg / LICENSE.md
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1#FFmpeg:
2
3Most files in FFmpeg are under the GNU Lesser General Public License version 2.1
4or later (LGPL v2.1+). Read the file COPYING.LGPLv2.1 for details. Some other
5files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to
6FFmpeg.
7
8Some optional parts of FFmpeg are licensed under the GNU General Public License
9version 2 or later (GPL v2+). See the file COPYING.GPLv2 for details. None of
10these parts are used by default, you have to explicitly pass --enable-gpl to
11configure to activate them. In this case, FFmpeg's license changes to GPL v2+.
12
13Specifically, the GPL parts of FFmpeg are:
14
15- libpostproc
16- libmpcodecs
17- optional x86 optimizations in the files
18 libavcodec/x86/flac_dsp_gpl.asm
19 libavcodec/x86/idct_mmx.c
20- libutvideo encoding/decoding wrappers in
21 libavcodec/libutvideo*.cpp
22- the X11 grabber in libavdevice/x11grab.c
23- the swresample test app in
24 libswresample/swresample-test.c
25- the texi2pod.pl tool
26- the following filters in libavfilter:
27 - f_ebur128.c
28 - vf_blackframe.c
29 - vf_boxblur.c
30 - vf_colormatrix.c
31 - vf_cropdetect.c
32 - vf_decimate.c
33 - vf_delogo.c
34 - vf_geq.c
35 - vf_histeq.c
36 - vf_hqdn3d.c
37 - vf_interlace.c
38 - vf_kerndeint.c
39 - vf_mcdeint.c
40 - vf_mp.c
41 - vf_owdenoise.c
42 - vf_perspective.c
43 - vf_phase.c
44 - vf_pp.c
45 - vf_pullup.c
46 - vf_sab.c
47 - vf_smartblur.c
48 - vf_spp.c
49 - vf_stereo3d.c
50 - vf_super2xsai.c
51 - vf_tinterlace.c
52 - vsrc_mptestsrc.c
53
54Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then
55the configure parameter --enable-version3 will activate this licensing option
56for you. Read the file COPYING.LGPLv3 or, if you have enabled GPL parts,
57COPYING.GPLv3 to learn the exact legal terms that apply in this case.
58
59There are a handful of files under other licensing terms, namely:
60
61* The files libavcodec/jfdctfst.c, libavcodec/jfdctint_template.c and
62 libavcodec/jrevdct.c are taken from libjpeg, see the top of the files for
63 licensing details. Specifically note that you must credit the IJG in the
64 documentation accompanying your program if you only distribute executables.
65 You must also indicate any changes including additions and deletions to
66 those three files in the documentation.
67 tests/reference.pnm is under the expat license
68
69
70external libraries
71==================
72
73FFmpeg can be combined with a number of external libraries, which sometimes
74affect the licensing of binaries resulting from the combination.
75
76compatible libraries
77--------------------
78
79The following libraries are under GPL:
80 - frei0r
81 - libcdio
82 - libutvideo
83 - libvidstab
84 - libx264
85 - libx265
86 - libxavs
87 - libxvid
88When combining them with FFmpeg, FFmpeg needs to be licensed as GPL as well by
89passing --enable-gpl to configure.
90
91The OpenCORE and VisualOn libraries are under the Apache License 2.0. That
92license is incompatible with the LGPL v2.1 and the GPL v2, but not with
93version 3 of those licenses. So to combine these libraries with FFmpeg, the
94license version needs to be upgraded by passing --enable-version3 to configure.
95
96incompatible libraries
97----------------------
98
99The Fraunhofer AAC library, FAAC and aacplus are under licenses which
100are incompatible with the GPLv2 and v3. We do not know for certain if their
101licenses are compatible with the LGPL.
102If you wish to enable these libraries, pass --enable-nonfree to configure.
103But note that if you enable any of these libraries the resulting binary will
104be under a complex license mix that is more restrictive than the LGPL and that
105may result in additional obligations. It is possible that these
106restrictions cause the resulting binary to be unredistributeable.