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 which links against the GPL2 jack/control.h, which
                  makes it GPL2