This file is indexed.

/usr/share/cups/templates/subscription-canceled.tmpl is in cups-server-common 1.7.2-0ubuntu1.

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

The actual contents of the file can be viewed below.

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<DIV CLASS="indent">

<P>Subscription #{notify_subscription_id} has been canceled.</P>

</DIV>