The Problem With Standard Keys
Standard commercial keys (Schlage Everest, Kwikset, basic Yale, etc.) have a fundamental security weakness: anyone with the key can walk into Home Depot, Lowe's, or a hardware store kiosk and have copies made for a few dollars. The "DO NOT DUPLICATE" stamp is a polite request, not a legal restriction or technical barrier. Most kiosks copy them anyway.
For most homeowners this isn't a big deal. For businesses, it's a real problem. Every former employee, contractor, cleaning person, or temporary worker who ever held a key to your property could have made copies. You have no way to know how many copies of your business keys exist or where they are.
What Restricted Key Systems Actually Do
A restricted key system uses patent-protected key blanks that aren't sold to the general public. The patent gives the manufacturer legal control over who can stock, cut, and distribute the blanks. Result:
- Hardware stores cannot duplicate them — they simply don't have the blanks, and can't legally obtain them
- Only authorized dealers can cut them — meaning Auburn Lock & Car Keys (as an authorized dealer) and similar authorized locksmiths in other regions
- Duplication requires written authorization — You (the registered system owner) must authorize each duplicate, in writing, with your signature card on file
- Patent protection lasts decades — Most current restricted systems have patents through 2030, 2035, or later
In practice: even if an employee steals a key, takes it to a hardware store, and asks for ten copies — they cannot get one made. The hardware store doesn't have the blank. Other regional locksmiths who happen to be authorized dealers for the same brand will refuse without your authorization. The key in their hand is effectively a one-of-one item that becomes useless when you change the lock.
Restricted Key System Brands
- Medeco Maxum / M3 / Cliq — The American standard for commercial restricted keys. Patent protection plus high-security mechanical design (sidebar finger pins, drill-resistant inserts).
- Mul-T-Lock MT5+ / Hercular / Interactive+ — Patented through 2035+. Telescoping pin design that's exceptionally pick-resistant in addition to the key control.
- Schlage Primus — Schlage's restricted keyway program. More affordable than Medeco / Mul-T-Lock while still providing real key control.
- Abloy Protec2 — Finnish high-security with rotating disc detainer mechanism, used in government and high-security commercial worldwide.
- BiLock, EVVA MCS, ASSA Twin Maximum — Specialty European restricted systems for very high-security applications.
How Authorization Works
When we install a restricted key system, you become the registered system owner. We file your name, business information, and signature card with the manufacturer. From that point forward:
- Only you (or designated authorized representatives) can authorize new keys
- Authorization is verified by matching signature against the registered card
- Some systems require additional ID verification
- You receive a "key authorization card" or similar document — keep this safe
- If you sell the business, system ownership transfers via documented signature change
Restricted Keys + Master Key System = Real Commercial Security
The strongest commercial setup combines a restricted keyway with a master key system. You get:
- Owner master key that opens everything (controlled, can't be duplicated)
- Department sub-master keys (controlled, role-specific)
- Individual employee change keys (controlled, door-specific)
- No risk of unauthorized duplication at any level
- Documented key inventory tracked over time
This is the gold standard for commercial security. See our master key systems page for the master keying side. Call (253) 796-8550 for a restricted key system consultation.
