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Window filming (I think)

I want windows that the neighbours cannot see into on a sunny day with the curtains open. I believe the solution is to put a film on them? No idea what it might cost so the expected cost is a guesstimate. Easy to access windows. Window 1 is sliding doors. Approx 76 inches wide and approx 71 inches tall (overall) Window 2 is also approx 76 inches wide and approx 45 inches tall.