I have never worried about my art, mostly because I didn't think anyone would steal it. However, in direct violation of most of my stock providers it is showing up outside of dA.
So in the grand tradition of closing the barn door (not to mention throwing the deadbolts, slamming the really heavy bar, and lowering the portcullis) after the horses have taken off for greener pastures. I have watermarked, lowered the resolution to 72 and the size to 600 wide on all my manipulations.
Hopefully this will discourage anyone from claiming it as their own... probably not but the best I can do at the moment.
Just to confuse, the watermark is my full name in Quenya.
has permission to showcase my artwork.