Hand a locksmith a key stamped 'DO NOT DUPLICATE' and watch what happens: sometimes we cut it without blinking, sometimes we ask for authorization, sometimes we refuse entirely. Here's why — and what it means for your security.
'Do not duplicate' is a request, not a lock
The stamp on a standard key is exactly that: a stamped request. Most hardware stores honor it as policy, but the key itself is cuttable on any machine. It deters casual copying and nothing more. If your security depends on that stamp, it depends on hope.
Restricted keyways are the real thing
A restricted keyway is a patented, controlled key blank distributed only to authorized locksmiths. The blanks physically don't exist at hardware stores or online. Duplication requires the authorization on file — your signature, your ID — and we log every key cut. This is genuine key control, and it's the standard for buildings, offices, and serious residential security.
What this means for you
Moving into a place with restricted keys? Good news — key control is already strong. Just get authorized copies through the issuing locksmith and keep the registration current. Managing a building? Restricted keyways plus a master key system is the professional standard. And if you're buying 'high security' locks, verify the keyway is actually restricted — the paperwork should be in your name.