This file is indexed.

/etc/dbus-1/system.d/com.ubuntu.USBCreator.conf is in usb-creator-common 0.2.56.

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>

  <!-- Only root can own the service -->
  <policy user="root">
    <allow own="com.ubuntu.USBCreator"/>
  </policy>

  <!-- Allow anyone to invoke methods (further constrained by
       PolicyKit privileges -->
  <policy context="default">
    <allow send_destination="com.ubuntu.USBCreator" 
           send_interface="com.ubuntu.USBCreator"/>
    <allow send_destination="com.ubuntu.USBCreator" 
           send_interface="org.freedesktop.DBus.Introspectable"/>
    <allow send_destination="com.ubuntu.USBCreator" 
           send_interface="org.freedesktop.DBus.Properties"/>
  </policy>

</busconfig>