| 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 |
| - libmpcodecs |
| - optional x86 optimizations in the files |
| libavcodec/x86/idct_mmx.c |
| - libutvideo encoding/decoding wrappers in |
| libavcodec/libutvideo*.cpp |
| - the X11 grabber in libavdevice/x11grab.c |
| - the swresample test app in |
| libswresample/swresample-test.c |
| - the texi2pod.pl tool |
| - the following filters in libavfilter: |
| - vf_blackframe.c |
| - vf_boxblur.c |
| - vf_colormatrix.c |
| - vf_cropdetect.c |
| - vf_delogo.c |
| - vf_hqdn3d.c |
| - vf_mp.c |
| - vf_super2xsai.c |
| - vf_tinterlace.c |
| - vf_yadif.c |
| - vsrc_mptestsrc.c |
| |
| 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. |
| |
| 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 |
| ================== |
| |
| FFmpeg can be combined with a number of external libraries, which sometimes |
| affect the licensing of binaries resulting from the combination. |
| |
| compatible libraries |
| -------------------- |
| |
| The libcdio, libx264, libxavs and libxvid libraries are under GPL. 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 |
| ---------------------- |
| |
| The Fraunhofer AAC library, FAAC and aacplus are under licenses which |
| are incompatible with the GPLv2 and v3. We do not know for certain if their |
| licenses are compatible with the LGPL. |
| If you wish to enable these libraries, 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 unredistributeable. |