This sounds like a transposition[0] and translation error. The word "effective" has two meanings: - Is strong enough to keep you from copying the thing - Has

This sounds like a transposition[0] and translation error. The word "effective" has two meanings: - Is strong enough to keep you from copying the thing - Has the effect of keeping you from copying the thing Congress intended the latter meaning and US courts adopted that. The first meaning would be self-defeating: once someone figured out how to break a copy protection system, it would no longer be effective, so you'd only be able to prosecute the first person to break the system. If effective meant "is strong enough" I don't think DVD CSS would count because they specifically used export-grade encryption. The rule (part of ITAR, AFAIK) was that 40-bits was the max entropy you could have, specifically so the NSA could break foreign-operated encryption systems. But this is kind of silly - computers are getting faster all the time, so it seems odd that a measure considered copy protection yesterday would stop being copy protection today just because we can crack passwords faster. [0] Transposition is the concept of copying EU regulations into member state law. I'm using the term slightly broader than EU law. While WTO rules don't have a direct transposition requirement, USTR conditioned lots of trade deals on transposing DMCA 1201 into local law.