Putting on a watermark or sig has already been said but if you do it than put it on in a way that makes it impposible to remove by cropping without destroying other noticeable details of the map. If someone sees a map than they can tell has been cropped they're going to ask about the rest of the map which can put the taker in an awkward situation. Of course people can remove the watermark in photoshop but if they have that kind of talent than they should really be making maps, not stealing them. Also, I've done a map at full resolution, or even full size in most cases and alwasy keep the psd file.

Not wanting to hijack the conversation but if you see a map and have questions about it, is it okay to post a sample of it here for inquiry if you reference where you got it?

-D-