Actually, if it were covered, the DMCA would make creating a bump key a crime in of itself. For instance, there was a time that simply linking to a DVD CSS desc

Actually, if it were covered, the DMCA would make creating a bump key a crime in of itself. For instance, there was a time that simply linking to a DVD CSS descrambler could get you in legal trouble. But considering the wide spread availability of such things, they don't bother anymore.