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Alt+PrintScreen. You can delete anything and everything you want. but if I printscreen your image, and save it seperatly, then its moot.
That said, a simpler solution is to host your own website with the images or flickr or photobucket or any other similar thing, and just have them up when you want and remove them when you dont. That way, they can visit the site/page, and only see the images while you have them hoseted/visible.
Either way, if I want to copy and save your image seperatly, there is probably very little you can do to stop it. And a self-destructing 'image/file' is far more complicated and less fool-proof than the other options IMHO.
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