Technology to stop a digital camera from taking a picture

Is there any technology that would prevent or distort a digital picture. For example..say you have a digital camera and I have a valuable antique and I don't want any pictures circulated but it will be on display.
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  1. Here you go http://tvtropes.org/pmwiki/pmwiki.php/Main/Bouncer

    Put a sign next to that "No cameras allowed or else".

    You can use a filter so the item is only viewable at a certain angle, with slats maybe.
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