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I have a similar thing on my laptop screen - useful for work stuff on airplanes... Mine is a bit of semi-thick plastic made by 3M, it has vertical strips in the plastic - so that you can only see the screen straight on. The viewing angle is fairly narrow, if you watch from a bit off head on the screen is darker, and fron the side it's all black, so it does work as promised. I did test that my iPhone does pick up the finger touches through it, so I'm assuming the ones for iPads are a similar construction.
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