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4656c375 DB |
1 | FFmpeg: |
2 | ------- | |
3 | ||
aae9c405 | 4 | Most files in FFmpeg are under the GNU Lesser General Public License version 2.1 |
ecc1330a DB |
5 | or later (LGPL v2.1+). Read the file COPYING.LGPLv2.1 for details. Some other |
6 | files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to | |
aae9c405 DB |
7 | FFmpeg. |
8 | ||
9 | Some optional parts of FFmpeg are licensed under the GNU General Public License | |
ecc1330a | 10 | version 2 or later (GPL v2+). See the file COPYING.GPLv2 for details. None of |
aae9c405 DB |
11 | these parts are used by default, you have to explicitly pass --enable-gpl to |
12 | configure to activate them. In this case, FFmpeg's license changes to GPL v2+. | |
13 | ||
14 | Specifically, the GPL parts of FFmpeg are | |
15 | ||
16 | - libpostproc | |
aae9c405 | 17 | - optional x86 optimizations in the files |
aae9c405 | 18 | libavcodec/x86/idct_mmx.c |
aae9c405 DB |
19 | - the X11 grabber in libavdevice/x11grab.c |
20 | ||
4656c375 DB |
21 | There are a handful of files under other licensing terms, namely: |
22 | ||
23 | * The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c | |
24 | are taken from libjpeg, see the top of the files for licensing details. | |
25 | ||
9cad0e4e DB |
26 | Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then |
27 | the configure parameter --enable-version3 will activate this licensing option | |
28 | for you. Read the file COPYING.LGPLv3 or, if you have enabled GPL parts, | |
29 | COPYING.GPLv3 to learn the exact legal terms that apply in this case. | |
30 | ||
4656c375 DB |
31 | |
32 | external libraries: | |
33 | ------------------- | |
34 | ||
aae9c405 DB |
35 | Some external libraries, e.g. libx264, are under GPL and can be used in |
36 | conjunction with FFmpeg. They require --enable-gpl to be passed to configure | |
37 | as well. | |
38 | ||
0b175caa DB |
39 | The OpenCORE external libraries are under the Apache License 2.0. That license |
40 | is incompatible with the LGPL v2.1 and the GPL v2, but not with version 3 of | |
41 | those licenses. So to combine the OpenCORE libraries with FFmpeg, the license | |
42 | version needs to be upgraded by passing --enable-version3 to configure. | |
43 | ||
fc1206a4 DB |
44 | The nonfree external library libfaac can be hooked up in FFmpeg. You need to |
45 | pass --enable-nonfree to configure to enable it. Employ this option with care | |
46 | as FFmpeg then becomes nonfree and unredistributable. |