How can I apply some kind of privacy film or tint to block out someone from looking in my front door?

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We have an oval door and someone keeps coming by our house and is trying to look in our home. I have security cameras catching them doing this. I am not sure what they want, but it's really making my family freak out. I have two little kids that always run to the front door and look out the side windows and see who's at the door. I have some kind of was paper film on the side, but it's not enough.
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