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Most files in FFmpeg are under the GNU Lesser General Public License version 2.1
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or later (LGPL v2.1+). Read the file COPYING.LGPL for details. Some other files
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have a MIT/X11/BSD-style license. In combination the LGPL v2.1+ applies to
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FFmpeg.
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Some optional parts of FFmpeg are licensed under the GNU General Public License
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version 2 or later (GPL v2+). See the file COPYING.GPL 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, FFmpeg's license changes to GPL v2+.
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Specifically, the GPL parts of FFmpeg are
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- libpostproc
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- some x86 optimizations in libswscale
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- optional x86 optimizations in the files
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libavcodec/x86/h264_deblock_sse2.asm
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libavcodec/x86/h264_idct_sse2.asm
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libavcodec/x86/idct_mmx.c
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- the AC-3 decoder in libavcodec/ac3dec.c
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- the X11 grabber in libavdevice/x11grab.c
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Some external libraries, e.g. libx264, are under GPL and can be used in
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conjunction with FFmpeg. They require --enable-gpl to be passed to configure
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as well.
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The nonfree external libraries libamrnb, libamrwb and libfaac can be hooked up
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in FFmpeg. You need to pass --enable-nonfree to configure to enable them. Employ
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this option with care as FFmpeg then becomes nonfree and unredistributable.
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Note that libfaac claims to be LGPL, but is not.
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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.c, libavcodec/jrevdct.c
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are taken from libjpeg, see the top of the files for licensing details.
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