Clarify license

fixes #1174

LICENSE

@@ -1,3 +1,11 @@
 All PipeWire source files are licensed under the MIT License.
 (see file COPYING for details)
 
+With the exception of:
+
+  libspa-alsa.so in spa/plugins/alsa, which contains LGPL code from
+                  Pulseaudio and is thus licensed as LGPL.
+
+  libjackserver.so with links against the GPL2 jack/control.h, which
+                  makes it GPL2
+

README.md

@@ -188,8 +188,9 @@ The Wiki can be found [here](https://gitlab.freedesktop.org/pipewire/pipewire/-/
 
 ## Contributing
 
-PipeWire is Free Software and is developed in the open. It is licensed under
-the [MIT license](COPYING).
+PipeWire is Free Software and is developed in the open. It is mostly
+licensed under the [MIT license](COPYING). Check [LICENSE](LICENSE) for
+more details about the exceptions.
 
 Contributors are encouraged to submit merge requests or file bugs on
 [gitlab](https://gitlab.freedesktop.org/pipewire).

meson.build

@@ -1,6 +1,6 @@
 project('pipewire', ['c' ],
   version : '0.3.27',
-  license : 'MIT',
+  license : [ 'MIT', 'LGPL-2.1-or-later', 'GPL-2.0-only' ],
   meson_version : '>= 0.49.0',
   default_options : [ 'warning_level=3',
                       'c_std=gnu99',