- Do not duplicate has no legal force and creates only hesitation.
- Real control comes from a restricted supply chain plus an active patent on the profile.
- Ask when the patent expires before promising a customer long term control.
- Without an issue log and a signature list, a restricted system decays into an ordinary one.
Do not duplicate is not key control
Stamping do not duplicate on a key has no legal force in most jurisdictions and no practical force anywhere. The blank is still freely available, the machine still cuts it, and plenty of counters will copy it without a second glance.
It does a small amount of good by creating hesitation, and that is the whole of what it does. Selling it to a customer as security is misleading them.
Say the truth. If a customer needs keys that cannot be copied, they need a restricted keyway, and that is a different product at a different price.
Restricted and patented keyways
A restricted keyway uses a blade profile that is only sold to authorized dealers, usually under a contract that says where and to whom keys may be cut. A patented keyway goes further, because the profile itself is covered by an active patent and manufacturing an unauthorized blank is an infringement.
That is the real mechanism. Not a marking on a key but a supply chain that a hardware store cannot join and a patent that makes unauthorized copies unlawful to produce.
Patents expire, and when they do the blanks become generally available. Ask what the patent expiry is before recommending a system to a customer who expects twenty years of control.
Running a key control program
The hardware is only half of it. The other half is administration. An authorized signature list says who may request a key. A key issue log says who holds which key and when it was signed for. A return procedure says what happens when somebody leaves.
Without the paperwork a restricted system decays into an ordinary one within two years, because keys accumulate in drawers and nobody knows how many exist.
Sell the program, not just the cylinders. Annual audits, a documented key list, a defined turnaround for new keys, and a rekeying allowance when control is lost. That is a service contract, it is recurring revenue, and it delivers something the customer cannot get from a box of locks.
Common Questions
What is key control?
Knowing who holds a key and being able to stop a copy being made. It is a patented keyway plus a signed record, and without both halves it is just a hope.
We lost a master key. What now?
Assume it is gone for good and rekey the group it opened. A master key in an unknown pocket opens every door under it and no amount of paperwork changes that.
Is a key cabinet worth it for a small site?
Yes, because staff change. The cabinet is cheap and the sign out sheet is what lets you answer the question of who had the key when something went missing.
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