I'm trying to backup my DVD collection onto my Linux box. Usually dvdbackup or ddrescue work just fine. With some DVDs, however, dvdbackup and ddrescue fail, likely due to copy protections.
I tried ddrescue with "-b 2048 -n /dev/sr0 movie.iso rescue.log", with "-d" and with "-r3" instead of "-n" – they all fail with these DVDs.
Did I use ddrescue correctly? What other programs are there? How do you rip your DVDs when they are protected like this?
— Clarification —
The DVDs are commercial movies and I want to "rip" the DVDs to my hard disk. Tools like dvdbackup, dvd::rip or ddrescue don't seem to work. I have a whole bunch of failing DVDs (many of them new) so it's not just a bad disc.