
Check out this article about T-Mobile apparently owning the color magenta so that no other telecommunications companies can use it.
"Don’t worry trademarks only apply to the industry sector that they are registered under and since DT applied for their trademark in the tele-communications sector you just can’t use the color magenta around anything to do with phones, digital media… oh and just about anything on the internet."
And also check out this site (in German I think?) about "freeing" Magenta.
