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There are some devices like that, but there's actually an easier approach. If you really want to keep your screen from being seen then you can make your screen a privacy screen. When someone tries to look at this from odd angles, they can't see anything but dark grey. The screen filters are easy to find at many online retailers(search privacy screen filter)....


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Yes. There are 'screen-protectors', or anti-glare protectors. A kind of foil you put on your screen so you can only see your screen in a specific angle (your angle). The other person would have hard times viewing your screen. NSA-employers are forced to use this. Also, on most Unix(-like) systems when you put in your password in the terminal, no asterix-...



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