[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 MMX optimizations for YUV to RGB colorspace conversion in
  libswscale/x86/yuv2rgb_template.c
- optional x86 optimizations in the files
  libavcodec/x86/h264_deblock_sse2.asm
  libavcodec/x86/h264_idct_sse2.asm
  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
c271ad21 DB	17	- optional MMX optimizations for YUV to RGB colorspace conversion in
c271ad21 DB	18	libswscale/x86/yuv2rgb_template.c
aae9c405 DB	19	- optional x86 optimizations in the files
	20	libavcodec/x86/h264_deblock_sse2.asm
	21	libavcodec/x86/h264_idct_sse2.asm
	22	libavcodec/x86/idct_mmx.c
aae9c405 DB	23	- the X11 grabber in libavdevice/x11grab.c
aae9c405 DB	24
4656c375 DB	25	There are a handful of files under other licensing terms, namely:
	26
	27	* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
	28	are taken from libjpeg, see the top of the files for licensing details.
	29
9cad0e4e DB	30	Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then
	31	the configure parameter --enable-version3 will activate this licensing option
	32	for you. Read the file COPYING.LGPLv3 or, if you have enabled GPL parts,
	33	COPYING.GPLv3 to learn the exact legal terms that apply in this case.
	34
4656c375 DB	35
	36	external libraries:
	37	-------------------
	38
aae9c405 DB	39	Some external libraries, e.g. libx264, are under GPL and can be used in
	40	conjunction with FFmpeg. They require --enable-gpl to be passed to configure
	41	as well.
	42
0b175caa DB	43	The OpenCORE external libraries are under the Apache License 2.0. That license
	44	is incompatible with the LGPL v2.1 and the GPL v2, but not with version 3 of
	45	those licenses. So to combine the OpenCORE libraries with FFmpeg, the license
	46	version needs to be upgraded by passing --enable-version3 to configure.
	47
fc1206a4 DB	48	The nonfree external library libfaac can be hooked up in FFmpeg. You need to
	49	pass --enable-nonfree to configure to enable it. Employ this option with care
	50	as FFmpeg then becomes nonfree and unredistributable.