If you were to log in, you'd be able to get more information on your fellow community member.
If you have real problems with people stealing your images, you could do a simple registration system. Offer a couple demo pictures with a watermark across the middle of it. If people want to view/download further images, they have to register (with confirm. email). A couple places I visit for stock photography do this. It gives you email addresses of who is downloading your photos, and I for one don't mind registering to download photos if I can see by the demos that they are good pics.