Maziar jan,
dont think you got the info right. when you, as the site owner, and owner of ISP server, want to register for ISP Server space and Domain name in the beginning, they ASK you for your FULL info, including first and last name, address, payment info,etc..and frankly since then anytime u search for ISP site tracking,etc ISP's owner names will fully appear bc servers are registered under their name.
so dont assume, they got this info from our "About us" page in ISP or something!lol there r far more accurate way of checking a site's real owners..
and thats exactly how all these yrs, they've managed to arrest Weblog site owners in Iran. cuz almost all of them(assuming they'd be safe, had fake names in their weblogs), but IR could easily find their IP Address,and server registration name to identify them and arrest them immediately in Iran.