FWIW digital watermarking is one solution, but it can be circumvented by anyone with Photoshop if they know what they're doing (fortunately, most people don't know the trick). It makes the task harder but does not annoy visitors. Where I work we actively warn visitors that the images in our digital archive are both copyrighted and watermarked. This leaves behind people who intentionally rip off images without concern for the consequences. I have noticed recently that RealPlayer One and the DVD playback software on my machine at work do not permit screengrabs, leaving behind a black rectangle in their place. The DVD does this because the image is being served directly to the video signal by the DVD hardware and therefore isn't cached in the computer's memory or hard drive. How RealPlayer does it is beyond me (and I haven't tested it with OS X yet). Since creating a RealPlayer slideshow of JPEGs on your system is about as hard as writing HTML, it could be an option. You'd also need to have an Apache directive on your server to disallow serving files from the images directory if the request doesn't come from the server. I don't know enough about IIS servers to know what the equivalent restriction is (if it exists). There is a script I've seen which works for both Netscape and IE, is double-encrypted to prevent casual source code readers from getting anything useful, and would require scripting to be turned on in order to view the images. Saving the page would not save the images. It still doesn't do anything to protect the cache, and won't circumvent Opera or a screengrab. Until all OSes are rewritten from the ground up to have digital security measures that assume a file should not be downloaded, cached, or saved to disk unless properly authorized, we're stuck with this problem. DMCA proponents and the RIAA would love to see such a restrictive computing environment, but they don't have the blessing of the world outside US jurisdiction, and our track record on convincing the rest of the world to blindly follow American interests has been less than stellar recently.