ThioJoe
I Love YTtalk
I can't post links but the modified link below is to a great article which talks about what you can do if someone takes your content and removes your watermark (which they did). From what I understand, he's automatically able to get at least $2500 in damages.
photoattorney (dot) com/2007/07/watermarks-can-be-music-to-your-ears.html
photoattorney (dot) com/2007/07/watermarks-can-be-music-to-your-ears.html