But arin.net doesn't give any personal information, it gives information about the owner of the IP (your ISP) not the user of it. Like your address for example tells you were you live not who's living in it. Would the RIAA call the ISP and ask them for information about the user and will it be legal to give out such information so easily because if that's the case, someone can easily social engineer an ISP worker to give them the users address.
Wow... I gave you more credit then that Raion... That stuff has been going on for ages... ...

**edit**

Oh I understand what your asking... Your asking if it's ok for third parties to force ISP's to give personal information about cutomers, and if it's legal for ISP's to do this...

Still, this has been going on for a while...