Content filter version one: A massive, network-wide dragnet. Not really feeling that Big Bro deal, even though RIAA chief Cary Sherman says it "doesn't give rise...to any privacy concerns because it can operate automatically and anonymously"? It's cool, there's a better approach: A locally installed filter on your computer.
As a bonus, a local filter would defeat encrypted torrents, since you've gotta decrypt 'em, at which point the filter would kick in. Sherman is a smart cookie though, and knows people aren't just gonna sign up to have their machine lojacked:
"Why would somebody put that on their machine? They wouldn't likely want to do that, they'd do that when it benefits them such as for viruses and so on and so forth...it could be enforced at the modem or put in by the ISP."