@ simple
For some reason so does C2D rely on 3rd party softwares for making backups of even non-protected movie discs through the 'Copy Video DVD' Option.
Have u tested to make a copy of the movie disc through the 'Copy Music/Data/Games' Option
I've tested to make a ISO image of a non protected movie dvd and then mounted it in DT and the movie played up just fine in PowerDVD.