X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=LICENSE;h=8dc2c8953dab3ae5fc4333353e89d696f50d1747;hb=d171a651dba7a738d3189234adb5a8c457fb3678;hp=61a080778d21d5b93637b0cd0bce65eed1ac3214;hpb=aae9c405c750f87798030a3be3ef4b41d9c27cb7;p=ffmpeg

diff --git a/LICENSE b/LICENSE
index 61a080778d2..8dc2c8953da 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,37 +1,50 @@
+FFmpeg:
+-------
+
 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
+or later (LGPL v2.1+). Read the file COPYING.LGPLv2.1 for details. Some other
+files have MIT/X11/BSD-style licenses. 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
+version 2 or later (GPL v2+). See the file COPYING.GPLv2 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
+- some x86 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 beomes 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.
+Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then
+the configure parameter --enable-version3 will activate this licensing option
+for 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 in
+conjunction with FFmpeg. They require --enable-gpl to be passed to configure
+as well.
+
+The OpenCORE external libraries are under the Apache License 2.0. That license
+is incompatible with the LGPL v2.1 and the GPL v2, but not with version 3 of
+those licenses. So to combine the OpenCORE libraries with FFmpeg, the license
+version needs to be upgraded by passing --enable-version3 to configure.
+
+The nonfree external libraries libamrnb, libamrwb and libfaac 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.
+Note that libfaac claims to be LGPL, but is not.