You should find a lawyer that has contacts with the German consulate. Right now, this kind of theft is tough to deal with. In the future, I suspect there will be better international IP laws. Even so, its costly to enforce those laws across an international boundary. You might want to contact the DOJ about it. The real key to this kind of stuff is to protect your data. Put up firewalls, reduce the image size, add watermarks, etc. I use thumbs only at my site. Folks don't like it, but the ones that complain are the ones that want the work for free so they can use it.