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Libav:
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======
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Most files in Libav are under the GNU Lesser General Public License version 2.1
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or later (LGPL v2.1+). Read the file COPYING.LGPLv2.1 for details. Some other
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files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to
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Libav.
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Some optional parts of Libav are licensed under the GNU General Public License
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version 2 or later (GPL v2+). See the file COPYING.GPLv2 for details. None of
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these parts are used by default, you have to explicitly pass --enable-gpl to
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configure to activate them. In this case, Libav's license changes to GPL v2+.
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Specifically, the GPL parts of Libav are
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- the X11 grabber in libavdevice/x11grab.c
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- the texi2pod.pl tool
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- the following filters in libavfilter:
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- vf_blackframe.c
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- vf_boxblur.c
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- vf_cropdetect.c
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- vf_delogo.c
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- vf_hqdn3d.c
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- vf_yadif.c
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There are a handful of files under other licensing terms, namely:
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* The files libavcodec/jfdctfst.c, libavcodec/jfdctint_template.c and
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libavcodec/jrevdct.c are taken from libjpeg, see the top of the files for
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licensing details. Specifically note that you must credit the IJG in the
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documentation accompanying your program if you only distribute executables.
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You must also indicate any changes including additions and deletions to
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those three files in the documentation.
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Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then
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the configure parameter --enable-version3 will activate this licensing option
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for you. Read the file COPYING.LGPLv3 or, if you have enabled GPL parts,
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COPYING.GPLv3 to learn the exact legal terms that apply in this case.
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external libraries
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==================
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Libav can be combined with a number of external libraries, which sometimes
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affect the licensing of binaries resulting from the combination.
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compatible libraries
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--------------------
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The libcdio, libx264, libxavs and libxvid libraries are under GPL. When
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combining them with Libav, Libav needs to be licensed as GPL as well by
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passing --enable-gpl to configure.
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The OpenCORE and VisualOn libraries are under the Apache License 2.0. That
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license is incompatible with the LGPL v2.1 and the GPL v2, but not with
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version 3 of those licenses. So to combine these libraries with Libav, the
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license version needs to be upgraded by passing --enable-version3 to configure.
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incompatible libraries
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----------------------
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The Fraunhofer AAC library, FAAC and OpenSSL are under licenses incompatible
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with all (L)GPL versions. Thus, unfortunately, since both licenses cannot be
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satisfied simultaneously, binaries resulting from the combination of Libav
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with these libraries are nonfree und unredistributable. If you wish to enable
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any of these libraries nonetheless, pass --enable-nonfree to configure.
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