/usr/lib/rygel-2.0/plugins/gst-launch.plugin is in rygel-gst-launch 0.20.3-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Version =
Module = gst-launch
Name = GstLaunch
License = LGPL
Description = Share GStreamer gst-launch compatible pipelines
Copyright = Copyright © Rygel maintainers
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