In general, and don't quote me on this because there are hundreds of contradictory arguments/examples, where a set of terms and conditions seeks to circumvent a law then you can ignore them for fun. Hence if my coat is stolen from a cloak room they can point at the sign saying it's not their responsibility as much as they like, they would lose if they bothered going to court over it.
Whether disc protection is stopping people making rightful backups I'm not quit sure, but
IMO it is very doubtful that a company could win a case against a person breaking disc protection to make backups of media they owned for purely personal reasons