This utility is a script to help with a security vulnerability recently reported in Mac OS X. It automatically applies several preference settings designed to prevent your system from executing potentially damaging AppleScript commands sent through your web browser (or any application using standard URL parsing conventions.)
This utility does not "Patch" your operating system. It sets preferences for the "Help Center" application as well as for Safari that you can set yourself if you prefer. It also installs a preference pane from Rubicode - "RCDefaultApp" - that will allow you to disable the automatic handling of the "Disk" and "Disks" url types to further secure your system.