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Apache License | ||
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FFmpeg: | ||
------- | ||
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Most files in FFmpeg 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 | ||
FFmpeg. | ||
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Some optional parts of FFmpeg 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+. | ||
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Specifically, the GPL parts of FFmpeg are | ||
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- libpostproc | ||
- optional x86 optimizations in the files | ||
libavcodec/x86/idct_mmx.c | ||
- the X11 grabber in libavdevice/x11grab.c | ||
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There are a handful of files under other licensing terms, namely: | ||
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* 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. | ||
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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. | ||
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external libraries: | ||
------------------- | ||
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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. | ||
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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. | ||
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The nonfree external libraries libfaac and libaacplus can be hooked up in FFmpeg. | ||
You need to pass --enable-nonfree to configure to enable it. Employ this option | ||
with care as FFmpeg then becomes nonfree and unredistributable. |
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