| Most files in FFmpeg are under the GNU Lesser General Public License version 2.1 |
| or later (LGPL v2.1+). Read the file COPYING.LGPL for details. Some other files |
| have a MIT/X11/BSD-style license. In combination the LGPL v2.1+ applies to |
| FFmpeg. |
| |
| Some optional parts of FFmpeg are licensed under the GNU General Public License |
| version 2 or later (GPL v2+). See the file COPYING.GPL 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, FFmpeg's license changes to GPL v2+. |
| |
| Specifically, the GPL parts of FFmpeg are |
| |
| - libpostproc |
| - some x86 and AltiVec optimizations in libswscale |
| - optional x86 optimizations in the files |
| libavcodec/x86/h264_deblock_sse2.asm |
| libavcodec/x86/h264_idct_sse2.asm |
| libavcodec/x86/idct_mmx.c |
| - the AC-3 decoder in libavcodec/ac3dec.c |
| - the X11 grabber in libavdevice/x11grab.c |
| |
| Some external libraries, e.g. libx264, are under GPL and can be used in |
| conjunction with FFmpeg. They require --enable-gpl to be passed to configure |
| as well. |
| |
| The nonfree external libraries libamrnb and libamrwb can be hooked up in FFmpeg. |
| You need to pass --enable-nonfree to configure to enable them. Employ this |
| option with care as FFmpeg then becomes nonfree and unredistributable. |
| |
| There 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. |
| |
| * 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. |
