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Have you tried privacy shields?
Considering getting one of these for iPad. They're like screen protectors -- a sheet of vinyl or whatever that clings to your screen -- but they're meant to shield what's on your screen from nearby eyeballs. I dunno how well they work, but it would be nice to have privacy when writing something aboard a plane, for instance. They seem to go for 50 bucks a pop, so I'd like to know how well they work and whether one brand is better than another, before I buy one.
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