This file is indexed.

/etc/dbus-1/system.d/com.canonical.Unity.Screen.conf is in unity-system-compositor 0.0.2+14.04.20140411-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<!DOCTYPE busconfig PUBLIC
 "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>

	<policy user="root">
		<allow own="com.canonical.Unity.Screen"/>
		<allow send_destination="com.canonical.Unity.Screen"
		       send_interface="com.canonical.Unity.Screen"/>
	</policy>

	<policy context="default">
		<allow send_destination="com.canonical.Unity.Screen"
		       send_interface="org.freedesktop.DBus.Introspectable"/>
	</policy>

</busconfig>