If a nerd like me can remove the protective film and stick it on top of my laptop monitor, anyone can. And it blocks the webcam 100%. I recently went through a Zoom lesson and during a 10 minute break in the middle, instead of turning my video off (which would have resulted in a black background and my name in white letters in my window), I closed the webcam lid and indeed I did watched my window go from daylight and my picture to total darkness.
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