/usr/share/dbus-1/services/org.gnome.Rygel1.service is in rygel 0.28.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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[D-BUS Service] Name=org.gnome.Rygel1 Exec=/usr/bin/rygel