Actually I've come to easily recognize the work of various cartographers just by viewing without seeing a signature. And their fans of mine that recognize my style as well. In one case someone pointed out a map which they thought was mine, due to similar style - I checked, it wasn't, but the thought exists that there are fans out there who know some of our styles and when they detect a map that might have been stolen, often it gets reported. So I'm not extremely worried, though I am always on the lookout.

GP