[libav.git] / LICENSE

FFmpeg:
-------

Most files in FFmpeg are under the GNU Lesser General Public License version 2.1
or later (LGPL v2.1+). Read the file COPYING.LGPLv2.1 for details. Some other
files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to
FFmpeg.

Some optional parts of FFmpeg are licensed under the GNU General Public License
version 2 or later (GPL v2+). See the file COPYING.GPLv2 for details. None of
these parts are used by default, you have to explicitly pass --enable-gpl to
configure to activate them. In this case, FFmpeg's license changes to GPL v2+.

Specifically, the GPL parts of FFmpeg are

- libpostproc
- optional x86 optimizations in the files
  libavcodec/x86/idct_mmx.c
- the X11 grabber in libavdevice/x11grab.c

There are a handful of files under other licensing terms, namely:

* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
  are taken from libjpeg, see the top of the files for licensing details.

Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then
the configure parameter --enable-version3 will activate this licensing option
for you. Read the file COPYING.LGPLv3 or, if you have enabled GPL parts,
COPYING.GPLv3 to learn the exact legal terms that apply in this case.


external libraries:
-------------------

Some external libraries, e.g. libx264, are under GPL and can be used in
conjunction with FFmpeg. They require --enable-gpl to be passed to configure
as well.

The OpenCORE external libraries are under the Apache License 2.0. That license
is incompatible with the LGPL v2.1 and the GPL v2, but not with version 3 of
those licenses. So to combine the OpenCORE libraries with FFmpeg, the license
version needs to be upgraded by passing --enable-version3 to configure.

The nonfree external library libfaac can be hooked up in FFmpeg. You need to
pass --enable-nonfree to configure to enable it. Employ this option with care
as FFmpeg then becomes nonfree and unredistributable.
Commit	Line	Data
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
ecc1330a DB	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
aae9c405 DB	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.