A standard key can be copied at any hardware store or big-box retail counter for a few dollars, no questions asked. For a property manager, that’s the entire problem with standard locks: once a key is issued, there’s no way to know how many copies exist. A restricted keyway system exists to close that gap.
What a Restricted Keyway Is
A restricted keyway is a key blank design that isn’t sold to the public. The physical shape of the blank is unique and patent-protected, and it’s only available through dealers who are specifically authorized by the manufacturer to order and cut it. A hardware store, a home improvement retailer, or a general locksmith without that authorization simply cannot get the blank — the manufacturer won’t sell it to them.
That single fact is what makes the system work. If a tenant, employee, or contractor takes their key to get a copy made somewhere unauthorized, the counter clerk can’t fill the order. There’s no blank to cut. The only way to get a legitimate duplicate is through the authorized dealer who controls that keyway.
Patent Protection
The uniqueness of a restricted keyway blank is protected by patent, which is what legally prevents other manufacturers from producing a compatible blank and selling it openly. Patents on key blank designs run for a set term and eventually expire, at which point the design can potentially become available more broadly. Property managers evaluating a restricted keyway system should ask their dealer about the current patent status of the specific keyway being proposed.
Key Blank Control
Beyond the patent itself, restricted keyway systems build in a tracking layer that standard keys don’t have. The manufacturer tracks every blank that ships, each blank is serialized, and the authorized dealer signs for every order placed. That creates an audit trail from the factory to the building: a specific number of blanks were shipped, to a specific dealer, for a specific customer. It’s the difference between “we think we know how many keys exist” and “we can prove how many keys exist.”
The Two Systems Pro Locksmith Supplies
Pro Locksmith LLC is an authorized dealer for both Medeco and Mul-T-Lock — two separate high-security, restricted keyway systems. Both are available only through authorized dealers, which is the point: most locksmiths, including many who advertise “high-security” locks, cannot order or cut restricted blanks for either system because they haven’t been authorized by the manufacturer to do so.
Medeco is a high-security restricted keyway system built around patent-protected key blanks that are cut and issued only through authorized dealers.
Mul-T-Lock is a separate high-security restricted keyway system, also built around patent-protected blanks available only through authorized dealers.
Both systems provide the same core protections: a patent-protected key blank shape, manufacturer-level serialized tracking, and dealer-only cutting. Neither is a “better” or “worse” version of the other — they’re two distinct engineering approaches to the same problem, and the right choice for a given building depends on the property’s existing hardware, the architecture of its master key system, and its specific security requirements. A property already running one system’s cylinders is usually best served by staying within that system; a property starting from scratch has a genuine choice between two well-established options.
Key Control Documentation
A restricted keyway system comes with paperwork that a standard lock never generates. New systems typically include a letter of authorization establishing who’s permitted to order keys for that system. From there, the authorized dealer maintains ongoing records of every key cut and issued. Building management can request a key log at any time showing exactly who holds a key to a given door — something that’s simply not possible with a lock that anyone can duplicate at a retail counter.
When a Building Should Upgrade
A few situations point clearly toward upgrading to a restricted keyway:
- The building currently uses standard Schlage or Kwikset key blanks. These are widely available and can be copied at any hardware store, which means the building has no real way to control how many keys exist.
- Keys have gone unaccounted for. If a key has been lost, not returned, or its whereabouts are unclear, every lock on that keyway is effectively compromised until it’s rekeyed.
- After tenant turnover. A departing tenant’s keys should stop working. A restricted system with proper key control makes it possible to know exactly which keys need to be collected or invalidated.
- After staff changes. Same logic as tenant turnover, applied to employees who had access to secure areas.
- After a security incident. Any break-in, theft, or unauthorized entry is a signal that the current key control — or lack of it — has already failed once.
Why This Matters for Property Managers Specifically
If a standard key gets copied without authorization and that copy is later used in a crime, a property manager who did nothing to control key duplication can be exposed to a negligence claim — the argument being that reasonable security measures weren’t in place. A restricted keyway system directly addresses that exposure. With serialized tracking and a documented key log, a property manager can show exactly how many keys exist and who holds each one. That’s a materially different position to be in than “we don’t know how many keys are out there.”
What Happens Without Key Control
Most buildings that end up switching to a restricted keyway aren’t planning ahead — they’re reacting to a problem that already happened. A common pattern: a property has run on standard Kwikset or Schlage cylinders for years, tenants have come and gone, and at some point management realizes nobody actually knows how many keys are in circulation. Maintenance staff have copies. A departed tenant may or may not have turned theirs in. A contractor was given a key for a single job three years ago and was never asked for it back.
At that point, the building has two options. Rekey everything on the same standard system and hope the same drift doesn’t happen again, or move to a restricted system where every future key is tracked from the day it’s cut. The second option costs more at the point of installation. It’s also the only one of the two that actually solves the underlying problem, because the standard system will drift out of control again for the exact same reason it did the first time — anyone with a key can get a copy made anywhere.
Master Key Systems and Restricted Keyways
Many commercial and multi-tenant properties run a master key system — a hierarchy where a master key opens every door, sub-masters open groups of doors, and individual change keys open only their assigned door. This kind of system is only as secure as its weakest key. If a single change key on a standard keyway gets copied without authorization, the holder of that copy still can’t get into other units, but the building has still lost track of a legitimate key. On a restricted keyway, that same change key can’t be duplicated by anyone outside the authorized dealer relationship, which means the master key hierarchy stays intact and verifiable at every level, not just at the top.
Building out or reworking a master key system is also where the choice between Medeco and Mul-T-Lock tends to get decided. Both manufacturers support multi-level master key architectures. The deciding factor is usually what’s already installed, since matching new cylinders to an existing system’s architecture is more practical than mixing two restricted platforms in the same building.
What to Ask a Dealer Before Upgrading
A property manager evaluating a restricted keyway upgrade should expect straight answers to a few questions: Who else is authorized to order keys for this system besides the current dealer? What documentation will we receive showing who holds which key? What happens if our authorized dealer relationship ends — can another authorized dealer for the same manufacturer service the system, or are we locked to one vendor? A legitimate authorized dealer should be able to answer all three without hesitation, because the manufacturer’s own dealer agreement addresses each one.
Sources: Medeco product catalog; Mul-T-Lock product catalog.
Pro Locksmith: Authorized Dealer for Both Systems
Pro Locksmith LLC is an authorized dealer for Medeco and Mul-T-Lock, serving commercial properties throughout Broward County and Miami-Dade, including Fort Lauderdale, Hollywood, Pembroke Pines, Davie, Pompano Beach, Coral Springs, and Miami. The company is licensed and insured, pricing is flat-rate and quoted up front, and a certificate of insurance is provided for commercial property managers.
To discuss which restricted keyway system fits your building, call Pro Locksmith LLC at (954) 406-8266.