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You can in the United States. In Switzerland and some other European countries you can not and you need to post signage anywhere you have cameras on your private property.

I am currently installing cameras and it's difficult because I can't mount it on the house facing out.

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Depending on where you are located you might want to check if your cameras offer a "black out" function. The camera essentially censors all public space with black bars.

That said, as far as I remember legality of this approach was "undecided" in a few places

I purchased one with the feature, dumb part is, it's a PTZ camera and the blackout part moves with the PTZ...

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