2012-10-11 00:04:08 +00:00
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mpv is a fork of mplayer2, which is a fork of MPlayer.
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2017-10-13 13:37:55 +00:00
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mpv as a whole is licensed under the GNU General Public License GPL version 2
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or later (called GPLv2+ in this document, see LICENSE.GPL for full license
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2024-10-20 06:17:47 +00:00
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text) by default. The mpv program is licensed the GNU Lesser General Public
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License LGPL version 2 or later (LGPLv2.1+ in this document, see LICENSE.LGPL
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for full license text) if built without using any GPL only files.
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The -Dgpl=false configure switch is provided as a convenience for excluding
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the GPL only files listed below from the build process.
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However, do note that the build system is provided "as is" and using the
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-Dgpl=false configure switch does not in itself create a LGPLv2.1+ license
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grant.
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Additionally, some non-program parts, such as the documentation and some config
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files listed below, are still built and licensed under their respective licenses
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even when -Dgpl=false is used. Please consult GPLv2+ and LGPLv2.1+ license texts
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for further details on how to distribute these files.
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2017-10-13 13:37:55 +00:00
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Most source files are LGPLv2.1+ or GPLv2+, but some files are available under
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more liberal licenses, such as BSD, MIT, ISC, and possibly others. Look at the
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copyright header of each source file, and grep the sources for "Copyright" if
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you need to know details. C source files without Copyright notice are usually
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licensed as LGPLv2.1+. Also see the list of files with specific licenses below
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(not all files can have a standard license header).
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2015-07-24 21:53:31 +00:00
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2017-10-10 14:21:01 +00:00
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All new contributions must be LGPLv2.1+ licensed. Using a more liberal license
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compatible to LGPLv2.1+ is also ok.
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2018-01-31 02:50:22 +00:00
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Changes done to GPL code must come with the implicit/explicit agreement that the
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2017-10-13 13:37:55 +00:00
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project can relicense the changes to LGPLv2.1+ at a later point without asking
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the contributor. This is a safeguard for making potential relicensing of
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remaining GPL code to LGPLv2.1+ easier.
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2003-12-09 08:35:55 +00:00
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2019-09-21 11:58:09 +00:00
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See DOCS/contribute.md for binding rules wrt. licensing for contributions.
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2013-10-12 23:18:50 +00:00
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For information about authors and contributors, consult the git log, which
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contains the complete SVN and CVS history as well.
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2010-01-04 13:01:44 +00:00
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2024-10-20 06:17:47 +00:00
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mpv can be built as LGPLv2.1+ without using any GPL only files. To add a
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2023-08-10 00:46:49 +00:00
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LGPL mode to mpv, MPlayer code had to be relicensed from GPLv2+ to LGPLv2.1+ by
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asking the MPlayer authors for permission. Since permission could not be
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obtained from everyone, LGPL mode disables the following features, some of them
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quite central:
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2017-09-21 11:50:18 +00:00
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- Linux X11 video output
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- BSD audio output via OSS
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2017-11-29 18:50:04 +00:00
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- NVIDIA/Linux hardware decoding (vdpau, although nvdec usually works)
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2024-10-20 06:25:20 +00:00
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- minor features: jack, DVD, CDDA, DVB, CACA, legacy direct3d VO
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player: change 3 remaining GPL-only code pieces to LGPL
There has been no new developments or agreements, but I was uncertain
about the copyright status of them. Thus this part of code was marked as
being potentially GPL, and was not built in LGPL mode. Now I've taken a
close look again, and decided that these can be relicensed using the
existing relicensing agreements.
OSD level 3 was introduced in commit 8d190244, with the author being
unreachable. As I decided in commit 6ddd95fd, OSD level 3 itself can
be kept, but the "osd" command had to go, and the "rendering" of OSD
level 3 (the HAVE_GPL code in osd.c) was uncertain. But the code for
this was rewritten: instead of duplicating the time/percent formatting
code, it was changed to use common code, and some weird extra logic was
removed. The code inside of the "if" is exactly the same as the code
that formats the OSD status line (covered by LGPL relicensing).
The current commands for adding/removing sub/audio tracks more or less
originated from commit 2f376d1b39, with the author being unreachable.
But the original code was very different, mostly due to MPlayer's
incredibly messy handling of subtitles in general. Nothing of this
remains in the current code. Even the command declarations were
rewritten. The commands (as seen from the user side) are rather similar
in naming and semantics, but we don't consider this copyrightable. So it
doesn't look like anything copyrightable is left.
The add/cycle commands were more or less based on step_property,
introduced in commit 7a71da01d6, with the patch author disagreeing with
the LGPL relicensing. But all code original to the patch has been
replaced in later mpv changes, and the original code was mostly copied
from MP_CMD_SET_PROPERTY anyway. The underlying property interface was
completely changed, the error handling was redone, and all of this is
very similar to the changes that were done on SET_PROPERTY. The command
declarations are completely different in the first place, because the
semantic change from step to add/cycle. The commit also seems to have
been co-authored by reimar to some degree. He also had the idea to
change the original patch from making the command modify a specific
property to making it generic.
(The error message line, especially with its %g formatting, might
contain some level of originality, so change that just to be sure.
This commit Copies and adapts the error message for SET_PROPERTY.)
Although I'm a bit on the fence with all the above things, it really
doesn't look like there's anything substantial that would cause issues.
I thus claim that there is no problem with changing the license to LGPL
for the above things. It's probably still slightly below the standard
that was usually applied in the code relicensing in mpv, but probably
still far above to the usual in open source relicensing (and above
commercial standards as well, if you look what certain tech giants do).
2017-11-24 13:04:53 +00:00
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Some of these will be fixed in the future. The intended use for LGPL mode is
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2017-11-29 16:29:41 +00:00
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with libmpv, and currently it's not recommended to build mpv CLI in LGPL mode
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2017-09-21 11:50:18 +00:00
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at all.
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2023-08-10 00:46:49 +00:00
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The following files are still GPL only (-Dgpl=false disables them):
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2017-05-05 06:38:30 +00:00
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audio/out: change license of some core files to LGPL
All contributors of the current code have agreed. ao.c requires a
"driver" entry for each audio output - we assume that if someone who
didn't agree to LGPL added a line, it's fine for ao.c to be LGPL
anyway. If the affected audio output is not disabled at compilation
time, the resulting binary will be GPL anyway, and ootherwise the
code is not included.
The audio output code itself was inspired or partially copied from
libao in 7a2eec4b59f4 (thus why MPlayer's audio code is named libao2).
Just to be sure we got permission from Aaron Holtzman, Jack Moffitt, and
Stan Seibert, who according to libao's SVN history and README are the
initial author. (Something similar was done for libvo, although the
commit relicensing it forgot to mention it.)
242aa6ebd40: anders mostly disagreed with the LGPL relicensing, but we
got permission for this particular commit.
0ef8e555735: nick could not be reached, but the include statement was
removed again anyway.
879e05a7c17: iive agreed to LGPL v3+ only, but this line of code was
removed anyway, so ao_null.c can be LGPL v2.1+.
9dd8f241ac2: patch author could not be reached, but the corresponding
code (old slave mode interface) was completely removed later.
2017-05-20 09:35:25 +00:00
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audio/out/ao_jack.c will stay GPL
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2017-05-05 06:38:30 +00:00
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audio/out/ao_oss.c will stay GPL
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stream/dvb* must stay GPL
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stream/stream_cdda.c unknown
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stream/stream_dvb.* must stay GPL
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stream/stream_dvdnav.c unknown
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video/out/vo_caca.c unknown
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video/out/vo_direct3d.c unknown
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video/out/vo_vaapi.c probably impossible (some company's code)
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video/out/vo_vdpau.c probably impossible (nVidia's code)
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video/out/vo_x11.c probably impossible
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video/out/vo_xv.c probably impossible
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video/out/x11_common.* probably impossible
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video/vdpau.c hard (GPL-only parts must be ifdefed)
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video/vdpau.h unknown
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video/vdpau_mixer.* actual code must be rewritten
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2017-10-10 14:21:01 +00:00
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DOCS/man/ GPLv2+
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etc/mplayer-input.conf unknown license, probably GPLv2+
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2024-10-20 06:25:20 +00:00
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etc/mpv.desktop unknown license, probably GPLv2+
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2017-11-29 16:29:41 +00:00
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etc/restore-old-bindings.conf unknown license, probably GPLv2+
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2017-09-21 11:50:18 +00:00
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2019-09-20 09:38:16 +00:00
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None of the cases listed above affect the final binary if it's built as
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2017-10-10 14:21:01 +00:00
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LGPL. Linked libraries still can affect the final license (for example if
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FFmpeg was built as GPL).
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