Attached Link: http://www.lib.berkeley.edu/~lcushing/pdfs/ImagePro.pdf

I don't think there is an easy way to prevent a graphic from being stolen is not to post it. I have a one line Javascript that will re-enable right-click on pages that have it disabled. There are utilities that will chop an image up and assemble them to look like a single image but that can be circumvented as well. The only (seemingly) workable solution I've seen is a product like the Mirage I mentioned earlier which uses a complicated encryption scheme. Even technology like digital watermarking would probably not be applicable when the image is going to be sliced up for tubes. The thrust of DRM security seems to be understandably aimed at protecting music and video data. You can reduce the resolution of an image to make it less attractive, display it as greyscale or place an obtrusive watermark on it but none of those is really desirable if your purpose is to show of the image in the first place. I've read that you can place a transparent HTML layer over a page which is somewhat akin to using the PSD layer but that to can be gotten around. Perhaps there's some other technique, but I haven't seen it. Beyond that, screen capture, searching the cache or some other method can be used to retrieve the image. The best that you can probably do for free is to try to make it inconvenient enough to discourage the casual image thief. reference: Protection of Digital Images on the Web

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken