[corentin88]

Imagine you start to look at houses in your neighborhood « to see if there is a door and what type of key it uses ».

That sounds pretty suspicious to me. At least you need the consent of the house’s owner.

[pbhjpbhj]

Do you need consent of the owner?

You might be doing a legitimate survey (as part of a locksmith business, say)?

[kchr]

Suspicious != Illegal.