A very interesting program - however- in my opion its only a matter of time before hollywood gets pissy and pulls the download...!
"DVDSynth is an open platform for developing various "virtual devices," particularly virtual CD/DVD-ROM drives and virtual discs to put in them. One of the most interesting things it can do is apply filters to physical devices in the system. Filters can change the contents of a CD or DVD in arbitrary ways on the fly."