As usual, elgringo14 is very right!
Its typically American music and movie (by that I mean, Hollywood movie) companies that are the ones pursuing people. However, they're pretty limited in the scope of what they can do. Your much more likely to receive a C & D letter from your ISP than you are to get in any deep trouble.
Again, that's the case for the very powerful mainstream music and movie companies. Adult film companies, on the other hand, have received next to no support in stemming any kind of piracy (yet they still manage to prosper somehow). To this day, adult material is probably the safest material to torrent or share. I can't even imagine the amount of pain in the rear paperwork that a simple adult film company would have to do to try and investigate piracy in another country (not to mention all the money it would take). Talk about a headache!
Like elgringo14 said, as long as you don't walk up to the copyright holder, computer in hand, and say "check it out, I got all your stuff free!" there's a pretty slim chance of getting into trouble.