[andrewas]

But be aware that this depends on the browser following the HTTP standards regarding the no-cache rules. It wouldnt be a massive programming task to make a 'browser' that simply pulls a given page and saves all images to disc.

And if its smaller than the screen, theres nothing to stop someone using the print screen function to capture it. (Although that saves a .bmp, re-encoding it to a .jpg would lose significant quality).

In the end, if you put something on the net and someone wants to steal it, its stolen.

One tactic that might work is putting a smaller/marked version on public display, and making the full thing members-only. At least that way the onyl thing thats easily stolen is a limited version. Of course, charging for membership might not be acceptable and if membership is free theres little benefit.