Attached Link: http://www.cl.cam.ac.uk/~fapp2/steganography/

Oh yeah, as for Adobe, you gan get serial number generators, the algorithms are well know, simply click the button for a clean one. I still reckon you'd be dumb to do it, for reasons outlined in other posts. Most of us will have no idea where to begin with photoshop, and who's to say it's not embedding the Serial # into your picture, along with anything else they feel like reading. Do you know what your jpegs are saying about you? :) later jb