From reading through the entire thread, it appears the question was orignally posted quite differently.
No, backing up your own (owned/purchased) software (including movies, audio, etc) is not illegal and actually practical. As I understand it, you may make a personal copy of rented movies (etc.) only during the rental period.
The young man and his father (Nordic country, I think) did face criminal charges for creating and distributing DeCSS - has that gone to trial yet?