/usr/share/dbus-1/services/org.gnome.evolution.dataserver.Sources.service is in evolution-data-server-common 3.10.4-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=org.gnome.evolution.dataserver.Sources2
Exec=/usr/lib/evolution/evolution-source-registry
|