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- Libav:
- ======
- Most files in Libav 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
- Libav.
- Some optional parts of Libav 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, Libav's license changes to GPL v2+.
- Specifically, the GPL parts of Libav are
- - the X11 grabber in libavdevice/x11grab.c
- - the texi2pod.pl tool
- - the following filters in libavfilter:
- - vf_blackframe.c
- - vf_boxblur.c
- - vf_cropdetect.c
- - vf_delogo.c
- - vf_hqdn3d.c
- - vf_interlace.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.
- external libraries
- ==================
- Libav 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, libx265, libxavs and libxvid libraries are under GPL. When
- combining them with Libav, Libav 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 Libav, the
- license version needs to be upgraded by passing --enable-version3 to configure.
- incompatible libraries
- ----------------------
- The Fraunhofer AAC library, FAAC and OpenSSL are under licenses incompatible
- with all (L)GPL versions. Thus, unfortunately, since both licenses cannot be
- satisfied simultaneously, binaries resulting from the combination of Libav
- with these libraries are nonfree und unredistributable. If you wish to enable
- any of these libraries nonetheless, pass --enable-nonfree to configure.
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