There have been a lot of comments (particularly in the copyright forum) about theft of images.
I know that Rendo has said that they cannot prevent people saving images out of the gallery.
Would it not be possible for Rendo to add a watermark to images to make it more inconvenient for those people who want to take images and claim them as their own or add them to their own websites? 
If ther was an option on uploading an image to have a watermark added that might please a lot of people.