That's the tough part, and the technological infeasibility is probably why the DMCA has no such provision. Even for Video, only YouTube has come up with a syste

That's the tough part, and the technological infeasibility is probably why the DMCA has no such provision. Even for Video, only YouTube has come up with a system that is "mostly right" for "most content" they have to deal with, that being Content ID, and it takes a lot of horsepower and a lot of money to run (and it requires that every rights holder must upload their content to the service for scanning; quite a feat).