I decided to look up if "chillhop" was trademarked out of curiosity. A quick search on the US trademark database and yep, "chillhop music" is trademarked. I guess technically you can't categorize your music as "chillhop music" without permission? Insane.

http://tmsearch.uspto.gov/bin/showfield?f=doc&state=4803:z2u5uu.2.1