mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
4.5 KiB
126 lines
4.5 KiB
# License |
|
|
|
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 optimization in the files |
|
- `libavcodec/x86/flac_dsp_gpl.asm` |
|
- `libavcodec/x86/idct_mmx.c` |
|
- `libavfilter/x86/vf_removegrain.asm` |
|
- libutvideo encoding/decoding wrappers in `libavcodec/libutvideo*.cpp` |
|
- the X11 grabber in `libavdevice/x11grab.c` |
|
- the following building and testing tools |
|
- `compat/solaris/make_sunver.pl` |
|
- `doc/t2h.pm` |
|
- `doc/texi2pod.pl` |
|
- `libswresample/swresample-test.c` |
|
- `tests/checkasm/*` |
|
- `tests/tiny_ssim.c` |
|
- the following filters in libavfilter: |
|
- `f_ebur128.c` |
|
- `vf_blackframe.c` |
|
- `vf_boxblur.c` |
|
- `vf_colormatrix.c` |
|
- `vf_cover_rect.c` |
|
- `vf_cropdetect.c` |
|
- `vf_delogo.c` |
|
- `vf_eq.c` |
|
- `vf_find_rect.c` |
|
- `vf_fspp.c` |
|
- `vf_geq.c` |
|
- `vf_histeq.c` |
|
- `vf_hqdn3d.c` |
|
- `vf_interlace.c` |
|
- `vf_kerndeint.c` |
|
- `vf_mcdeint.c` |
|
- `vf_mpdecimate.c` |
|
- `vf_owdenoise.c` |
|
- `vf_perspective.c` |
|
- `vf_phase.c` |
|
- `vf_pp.c` |
|
- `vf_pp7.c` |
|
- `vf_pullup.c` |
|
- `vf_repeatfields.c` |
|
- `vf_sab.c` |
|
- `vf_smartblur.c` |
|
- `vf_spp.c` |
|
- `vf_stereo3d.c` |
|
- `vf_super2xsai.c` |
|
- `vf_tinterlace.c` |
|
- `vf_uspp.c` |
|
- `vsrc_mptestsrc.c` |
|
|
|
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. |
|
|
|
There are a handful of files under other licensing terms, namely: |
|
|
|
* The files `libavcodec/jfdctfst.c`, `libavcodec/jfdctint_template.c` and |
|
`libavcodec/jrevdct.c` are taken from libjpeg, see the top of the files for |
|
licensing details. Specifically note that you must credit the IJG in the |
|
documentation accompanying your program if you only distribute executables. |
|
You must also indicate any changes including additions and deletions to |
|
those three files in the documentation. |
|
* `tests/reference.pnm` is under the expat license. |
|
|
|
|
|
## External libraries |
|
|
|
FFmpeg can be combined with a number of external libraries, which sometimes |
|
affect the licensing of binaries resulting from the combination. |
|
|
|
### Compatible libraries |
|
|
|
The following libraries are under GPL: |
|
- frei0r |
|
- libcdio |
|
- librubberband |
|
- libutvideo |
|
- libvidstab |
|
- libx264 |
|
- libx265 |
|
- libxavs |
|
- libxvid |
|
|
|
When combining them with FFmpeg, FFmpeg needs to be licensed as GPL as well by |
|
passing `--enable-gpl` to configure. |
|
|
|
The OpenCORE and VisualOn 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 these libraries with FFmpeg, the |
|
license version needs to be upgraded by passing `--enable-version3` to configure. |
|
|
|
### Incompatible libraries |
|
|
|
There are certain libraries you can combine with FFmpeg whose licenses are not |
|
compatible with the GPL and/or the LGPL. If you wish to enable these |
|
libraries, even in circumstances that their license may be incompatible, pass |
|
`--enable-nonfree` to configure. But note that if you enable any of these |
|
libraries the resulting binary will be under a complex license mix that is |
|
more restrictive than the LGPL and that may result in additional obligations. |
|
It is possible that these restrictions cause the resulting binary to be |
|
unredistributable. |
|
|
|
The Fraunhofer FDK AAC and OpenSSL libraries are under licenses which are |
|
incompatible with the GPLv2 and v3. To the best of our knowledge, they are |
|
compatible with the LGPL. |
|
|
|
The FAAC library is incompatible with all versions of GPL and LGPL. |
|
|
|
The NVENC library, while its header file is licensed under the compatible MIT |
|
license, requires a proprietary binary blob at run time, and is deemed to be |
|
incompatible with the GPL. We are not certain if it is compatible with the |
|
LGPL, but we require `--enable-nonfree` even with LGPL configurations in case |
|
it is not.
|
|
|