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FFmpeg README
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1) Documentation
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* Read the documentation in the doc/ directory.
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2) Licensing
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* Read the file COPYING.LGPL. FFmpeg and the associated libraries EXCEPT
  for libpostproc and libswscale are licensed under the GNU Lesser General
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  Public License.
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* libpostproc and libswscale are distributed under the GNU General Public
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  License, see the file COPYING.GPL for details. Their compilation and use
  in FFmpeg is optional.
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* The file libavcodec/x86/idct_mmx.c is distributed under the GNU General
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  Public License. It is strictly an optimization and its use is optional.

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* The file libavcodec/ac3dec.c is distributed under the GNU General Public
  License.  In order for (E-)AC-3 decoding to work you need to enable GPL
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  components.
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* The file libavdevice/x11grab.c is distributed under the GNU General
  Public License. X11 grabbing is optional.

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* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
  are taken from libjpeg, see the top of the files for licensing details.

* The file libavcodec/fdctref.c is copyrighted by the MPEG Software Simulation
  Group with all rights reserved. It is only used to create a DCT test program
  and not compiled into libavcodec.