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Libav:------Most files in Libav are under the GNU Lesser General Public License version 2.1or later (LGPL v2.1+). Read the file COPYING.LGPLv2.1 for details. Some otherfiles have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies toLibav.Some optional parts of Libav are licensed under the GNU General Public Licenseversion 2 or later (GPL v2+). See the file COPYING.GPLv2 for details. None ofthese parts are used by default, you have to explicitly pass --enable-gpl toconfigure to activate them. In this case, Libav's license changes to GPL v2+.Specifically, the GPL parts of Libav are- libpostproc- optional x86 optimizations in the files libavcodec/x86/idct_mmx.c- the X11 grabber in libavdevice/x11grab.cThere are a handful of files under other licensing terms, namely:* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c are taken from libjpeg, see the top of the files for licensing details.Should you, for whatever reason, prefer to use version 3 of the (L)GPL, thenthe configure parameter --enable-version3 will activate this licensing optionfor 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:-------------------Some external libraries, e.g. libx264, are under GPL and can be used inconjunction with Libav. They require --enable-gpl to be passed to configureas well.The OpenCORE external libraries are under the Apache License 2.0. That licenseis incompatible with the LGPL v2.1 and the GPL v2, but not with version 3 ofthose licenses. So to combine the OpenCORE libraries with Libav, the licenseversion needs to be upgraded by passing --enable-version3 to configure.The nonfree external library libfaac can be hooked up in Libav. You need topass --enable-nonfree to configure to enable it. Employ this option with careas Libav then becomes nonfree and unredistributable.