That thing is useless Gene and a waste of a website owners time. I had the location of one of the images on his server in 3 seconds.
http://www.bobstaake.com/copyno/lichtenstein.gif
The people that grab your stuff and repost it know how to do just what I did to get that. (It's often kids too!)
I stand by my thought that the best way these days to handle it is to let them be your "agents" and work for you. Blast your URL on your images/video and everytime they post it some place, they just advertised your website for you and you didn't pay them a dime for it.
The fiasco with Mike Hollingshead's images is a great example. Could you imagine the kind of traffic he would have instantly had if he originaly would have had his URL on those images that got viral emailed around?
They you just have to worry about going after the jerks that either removed the copyright, altered the material, or are profiting off of it in some way.
Think of it in reverse. How much money would you have to pay out (not including your own time) to get your website URL on just a few hundred websites around the net? How much was that image worth?