Commit d80a3cf5 authored by Colin Guthrie's avatar Colin Guthrie

Update LICENSE.

Some of the license wording was less than clear. Try to clarify the
different GPL 'downgrade' scenarios but also be generic to ensure that
those packagers where GPL is a problem check thoroughly before they ship.

Inspired by comments from Brian Cameron @ Oracle via fdo#41822
parent 12fe7569
All PulseAudio source files are licensed under the GNU Lesser General Public
License. (see file LGPL for details)
However, the server side links to the GPL-only library 'libsamplerate' which
practically downgrades the license of the server part to GPL (see file GPL for
details), exercising section 3 of the LGPL.
Hence you should treat the client library ('libpulse') of PulseAudio as being
LGPL licensed and the server part ('libpulsecore') as being GPL licensed. Since
the PulseAudio daemon and the modules link to 'libpulsecore' they are of course
also GPL licensed.
However, the server side has optional GPL dependencies. These include the
libsamplerate (for core libraries) and bluez (for the bluetooth proximity helper
program) libraries, although others may also be included in the future. If
PulseAudio is compiled with these optional components, this effectively
downgrades the license of the server part to GPL (see file GPL for details),
exercising section 3 of the LGPL. In such circumstances, you should treat the
client library (libpulse) of PulseAudio as being LGPL licensed and the server
part (libpulsecore) as being GPL licensed. Since the PulseAudio daemon, tests,
various utilities/helpers and the modules link to libpulsecore and/or the
afore mentioned optional GPL dependencies they are of course also GPL licensed
also in this scenario.
Andre Adrian's echo cancellation implementation is licensed under a less
restrictive license - see src/modules/echo-cancel/adrian-license.txt for
details.
-- Lennart Poettering, April 20th, 2006.
Some other files pulled into PA source (i.e. reference implementations that are
considered too small and stable to be considered as an external library) use the
more permissive MIT license. This include the device reservation DBus protocol
and realtime kit implementations.
Additionally, a more permissive Sun license is used for code that performs
u-law, A-law and linear PCM conversions.
While we attempt to provide a summary here, it is the ultimate responsibility of
the packager to ensure the components they use in their build of PulseAudio
meets their license requirements.
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