I'm actually in support of this approach so long as the RIAA and MPAA have some proof that the person actually completed their download. The ISP should not be turning over this info (sans court order I might add) just because a business wants them to. What's to stop me from requesting subscriber information from AT&T when I receive a blog comment that I don't like? Now the RIAA and MPAA has to give the subscriber 5 strikes before they can go after them. A little extra investigation never hurt anyone and sometimes when you take your time you can actually find out what is going on.