If you were to log in, you'd be able to get more information on your fellow community member.
I think Darryl Gray's idea of adding a copyright message to all images doesn't really work. Of course, adding a copyright message in big, bold letters will be difficult to remove and thus it will protect the image. However, it will also ruin the image. And small messages that do not hurt the image, will probably be easy to erase.
It might be interesting to know that SICP is available online, from MIT Press: