I have had some of my 2d work stolen and SOLD on ebay (my NHL wallapers). Even so, I cant see pasting crap all over my images as to ruin them. On my 2d work now, I do put my logo mark hidden as best I can somewhere in the pic. Kind of like the PLayboy bunny on the covers. This is the risk we all take. But to go over board.. well, thats his call.