Thanks for your point Rutra. I'm looking for opinions at the moment. I too only used a very minimal 12pt signature in the bottom right of the picture until last week. But all my images have always been invisibly watermarked, which I though was enough (but not against printing). I have had a few disturbing incidents lately, so I am trying this and that and see what happens. I certainly feel more comfortable at the moment, although the visible watermark does look better on some pictures than others. It's a compromise! Although I did take it off my latest one since I have now started to use the Digimarc logo on my gallery pages.

I suppose another good protection is the fact that posting them here, or elsewhere, does to time and date stamp them.