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| author | Diego Biurrun <diego@biurrun.de> | 2012-07-21 21:17:30 +0000 |
|---|---|---|
| committer | Diego Biurrun <diego@biurrun.de> | 2012-08-12 13:28:58 +0200 |
| commit | f30ff542000490d6044df0403dd8f0aee78b0106 (patch) | |
| tree | 9a42a2e3092b469de7105e7c06e6c00fbe4058d5 /LICENSE | |
| parent | bdefe22b8e8c5c1cbcb20595b8eedc052aa8e6e9 (diff) | |
| download | ffmpeg-f30ff542000490d6044df0403dd8f0aee78b0106.tar.gz | |
doc: Clarify licensing issues arising from external libraries
Diffstat (limited to 'LICENSE')
| -rw-r--r-- | LICENSE | 37 |
1 files changed, 24 insertions, 13 deletions
@@ -1,5 +1,5 @@ Libav: ------- +====== 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 @@ -38,18 +38,29 @@ 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: -------------------- +external libraries +================== -Some external libraries, e.g. libx264, are under GPL and can be used in -conjunction with Libav. They require --enable-gpl to be passed to configure -as well. +Libav can be combined with a number of external libraries, which sometimes +affect the licensing of binaries resulting from the combination. -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. +compatible libraries +-------------------- -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. +The libcdio, libx264, libxavs and libxvid libraries are under GPL. When +combining them with Libav, Libav needs to be licensed as GPL as well by +passing --enable-gpl to configure. + +The OpenCORE and VisualOn 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 these libraries with Libav, the +license version needs to be upgraded by passing --enable-version3 to configure. + +incompatible libraries +---------------------- + +The Fraunhofer AAC library, FAAC and OpenSSL are under licenses incompatible +with all (L)GPL versions. Thus, unfortunately, since both licenses cannot be +satisfied simultaneously, binaries resulting from the combination of Libav +with these libraries are nonfree und unredistributable. If you wish to enable +any of these libraries nonetheless, pass --enable-nonfree to configure. |