X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=LICENSE;h=97923b138094c8aede7716097a75473832a25ffb;hb=14f063d294a18a31928d2167a66b1087910e14c8;hp=7cb34d7597a187d0e34d61dba5cf90de3e76db8d;hpb=3ba153f8da1f7c4f0191fa9e8344cd699eb5b65f;p=ffmpeg

diff --git a/LICENSE b/LICENSE
index 7cb34d7597a..97923b13809 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,33 +1,49 @@
-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.
+Libav:
+------
 
-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
+Most files in Libav are under the GNU Lesser General Public License version 2.1
+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
+Libav.
+
+Some optional parts of Libav are licensed under the GNU General Public License
+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+.
+configure to activate them. In this case, Libav's license changes to GPL v2+.
 
-Specifically, the GPL parts of FFmpeg are
+Specifically, the GPL parts of Libav are
 
-- libpostproc
-- 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
 
+There are a handful of files under other licensing terms, namely:
+
+* The files libavcodec/jfdctfst.c, libavcodec/jfdctint_template.c and
+  libavcodec/jrevdct.c are taken from libjpeg, see the top of the files for
+  licensing details. Specifically note that you must credit the IJG in the
+  documentation accompanying your program if you only distribute executables.
+  You must also indicate any changes including additions and deletions to
+  those three files in the documentation.
+
+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
+conjunction with Libav. 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 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 Libav, the license
+version needs to be upgraded by passing --enable-version3 to configure.
 
-* 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 nonfree external library libfaac can be hooked up in Libav. You need to
+pass --enable-nonfree to configure to enable it. Employ this option with care
+as Libav then becomes nonfree and unredistributable.