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1 | | -MIT License |
2 | | - |
3 | | -Copyright (c) 2022 zerpico@yandex.ru |
4 | | - |
5 | | -Permission is hereby granted, free of charge, to any person obtaining a copy |
6 | | -of this software and associated documentation files (the "Software"), to deal |
7 | | -in the Software without restriction, including without limitation the rights |
8 | | -to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
9 | | -copies of the Software, and to permit persons to whom the Software is |
10 | | -furnished to do so, subject to the following conditions: |
11 | | - |
12 | | -The above copyright notice and this permission notice shall be included in all |
13 | | -copies or substantial portions of the Software. |
14 | | - |
15 | | -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
16 | | -IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
17 | | -FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
18 | | -AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
19 | | -LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
20 | | -OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
21 | | -SOFTWARE. |
| 1 | +# License |
| 2 | + |
| 3 | +Most files in FFmpeg are under the GNU Lesser General Public License version 2.1 |
| 4 | +or later (LGPL v2.1+). Read the file `COPYING.LGPLv2.1` for details. Some other |
| 5 | +files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to |
| 6 | +FFmpeg. |
| 7 | + |
| 8 | +Some optional parts of FFmpeg are licensed under the GNU General Public License |
| 9 | +version 2 or later (GPL v2+). See the file `COPYING.GPLv2` for details. None of |
| 10 | +these parts are used by default, you have to explicitly pass `--enable-gpl` to |
| 11 | +configure to activate them. In this case, FFmpeg's license changes to GPL v2+. |
| 12 | + |
| 13 | +Specifically, the GPL parts of FFmpeg are: |
| 14 | + |
| 15 | +- libpostproc |
| 16 | +- optional x86 optimization in the files |
| 17 | + - `libavcodec/x86/flac_dsp_gpl.asm` |
| 18 | + - `libavcodec/x86/idct_mmx.c` |
| 19 | + - `libavfilter/x86/vf_removegrain.asm` |
| 20 | +- the following building and testing tools |
| 21 | + - `compat/solaris/make_sunver.pl` |
| 22 | + - `doc/t2h.pm` |
| 23 | + - `doc/texi2pod.pl` |
| 24 | + - `libswresample/tests/swresample.c` |
| 25 | + - `tests/checkasm/*` |
| 26 | + - `tests/tiny_ssim.c` |
| 27 | +- the following filters in libavfilter: |
| 28 | + - `signature_lookup.c` |
| 29 | + - `vf_blackframe.c` |
| 30 | + - `vf_boxblur.c` |
| 31 | + - `vf_colormatrix.c` |
| 32 | + - `vf_cover_rect.c` |
| 33 | + - `vf_cropdetect.c` |
| 34 | + - `vf_delogo.c` |
| 35 | + - `vf_eq.c` |
| 36 | + - `vf_find_rect.c` |
| 37 | + - `vf_fspp.c` |
| 38 | + - `vf_histeq.c` |
| 39 | + - `vf_hqdn3d.c` |
| 40 | + - `vf_kerndeint.c` |
| 41 | + - `vf_lensfun.c` (GPL version 3 or later) |
| 42 | + - `vf_mcdeint.c` |
| 43 | + - `vf_mpdecimate.c` |
| 44 | + - `vf_nnedi.c` |
| 45 | + - `vf_owdenoise.c` |
| 46 | + - `vf_perspective.c` |
| 47 | + - `vf_phase.c` |
| 48 | + - `vf_pp.c` |
| 49 | + - `vf_pp7.c` |
| 50 | + - `vf_pullup.c` |
| 51 | + - `vf_repeatfields.c` |
| 52 | + - `vf_sab.c` |
| 53 | + - `vf_signature.c` |
| 54 | + - `vf_smartblur.c` |
| 55 | + - `vf_spp.c` |
| 56 | + - `vf_stereo3d.c` |
| 57 | + - `vf_super2xsai.c` |
| 58 | + - `vf_tinterlace.c` |
| 59 | + - `vf_uspp.c` |
| 60 | + - `vf_vaguedenoiser.c` |
| 61 | + - `vsrc_mptestsrc.c` |
| 62 | + |
| 63 | +Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then |
| 64 | +the configure parameter `--enable-version3` will activate this licensing option |
| 65 | +for you. Read the file `COPYING.LGPLv3` or, if you have enabled GPL parts, |
| 66 | +`COPYING.GPLv3` to learn the exact legal terms that apply in this case. |
| 67 | + |
| 68 | +There are a handful of files under other licensing terms, namely: |
| 69 | + |
| 70 | +* The files `libavcodec/jfdctfst.c`, `libavcodec/jfdctint_template.c` and |
| 71 | + `libavcodec/jrevdct.c` are taken from libjpeg, see the top of the files for |
| 72 | + licensing details. Specifically note that you must credit the IJG in the |
| 73 | + documentation accompanying your program if you only distribute executables. |
| 74 | + You must also indicate any changes including additions and deletions to |
| 75 | + those three files in the documentation. |
| 76 | +* `tests/reference.pnm` is under the expat license. |
| 77 | + |
| 78 | + |
| 79 | +## External libraries |
| 80 | + |
| 81 | +FFmpeg can be combined with a number of external libraries, which sometimes |
| 82 | +affect the licensing of binaries resulting from the combination. |
| 83 | + |
| 84 | +### Compatible libraries |
| 85 | + |
| 86 | +The following libraries are under GPL version 2: |
| 87 | +- avisynth |
| 88 | +- frei0r |
| 89 | +- libcdio |
| 90 | +- libdavs2 |
| 91 | +- librubberband |
| 92 | +- libvidstab |
| 93 | +- libx264 |
| 94 | +- libx265 |
| 95 | +- libxavs |
| 96 | +- libxavs2 |
| 97 | +- libxvid |
| 98 | + |
| 99 | +When combining them with FFmpeg, FFmpeg needs to be licensed as GPL as well by |
| 100 | +passing `--enable-gpl` to configure. |
| 101 | + |
| 102 | +The following libraries are under LGPL version 3: |
| 103 | +- gmp |
| 104 | +- libaribb24 |
| 105 | +- liblensfun |
| 106 | + |
| 107 | +When combining them with FFmpeg, use the configure option `--enable-version3` to |
| 108 | +upgrade FFmpeg to the LGPL v3. |
| 109 | + |
| 110 | +The VMAF, mbedTLS, RK MPI, OpenCORE and VisualOn libraries are under the Apache License |
| 111 | +2.0. That license is incompatible with the LGPL v2.1 and the GPL v2, but not with |
| 112 | +version 3 of those licenses. So to combine these libraries with FFmpeg, the |
| 113 | +license version needs to be upgraded by passing `--enable-version3` to configure. |
| 114 | + |
| 115 | +The smbclient library is under the GPL v3, to combine it with FFmpeg, |
| 116 | +the options `--enable-gpl` and `--enable-version3` have to be passed to |
| 117 | +configure to upgrade FFmpeg to the GPL v3. |
| 118 | + |
| 119 | +### Incompatible libraries |
| 120 | + |
| 121 | +There are certain libraries you can combine with FFmpeg whose licenses are not |
| 122 | +compatible with the GPL and/or the LGPL. If you wish to enable these |
| 123 | +libraries, even in circumstances that their license may be incompatible, pass |
| 124 | +`--enable-nonfree` to configure. This will cause the resulting binary to be |
| 125 | +unredistributable. |
| 126 | + |
| 127 | +The Fraunhofer FDK AAC and OpenSSL libraries are under licenses which are |
| 128 | +incompatible with the GPLv2 and v3. To the best of our knowledge, they are |
| 129 | +compatible with the LGPL. |
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