Oh wow, they sued someone who used his last name as a domain name because they feel like their trademark should allow them to prohibit him from using his family name ... And obviously they registered their trademark after he started using his name.
Prince Rogers Nelson's given name was a registered trademark of Warner Music. It took that whole stunt with him changing his name to Love Symbol #2 to get them to relent.
i didn't know that prince was the same as prince rogers nelson (only vaguely remembered the name prince as a musician from dances at high school), so googled his name: