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ResidentialHigh-security cylinders with restricted keys: copies only with your card, and real resistance to picking, bumping and drilling.

Keys can't be copied at a kiosk or hardware store, so you control exactly how many exist.
Ground-floor apartments, homes that were broken into, offices with valuables, landlords tired of untracked copies.
Often only the cylinder changes; your existing lock body stays.
For street-level doors and anyone who's been burgled, yes.
Yes, with the ID card that comes with the system.