Sarah,
I actually have put a legal statement on the back of proofs using labels which is not all that time-intensive because I can print out the labels during my down time.

Unfortunately, there is no easy solution. And I fear it's going to get worse. Folks with camera phones think they're photographers. Many people have no appreciation for what professionals bring to the process of creating decent images whether it's of dogs or of the Grand Canyon.

If people don't value what you do, they won't pay for it. And if they think it's OK to simply take images off of websites -- or music, movies, TV shows, etc. -- then they'll steal anything without having any qualms.

Sorry if I sound cynical. But when things are easy to do, people do it. Especially if it means getting something for nothing.

Meanwhile, all we can do is continue to try to produce a superior product and go find people who value it.

Jim