Will blank out any request to an image on your site unless accessed through a site in the allowed hosts section. You can replace the "-" in the rewrite rule with a "bad" image which will redirect any unauthorized request to load.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.