/usr/lib/rhythmbox/plugins/mpris/mpris.plugin is in rhythmbox-plugins 2.96-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | [Plugin]
Module=mpris
IAge=2
Name=MPRIS D-Bus interface
Description=Provides an implementation of the MPRIS D-Bus interface specification
Authors=Jonathan Matthew
Copyright=Copyright © 2010 Jonathan Matthew
Website=http://www.rhythmbox.org/
[RB]
InitiallyEnabled=true
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