'Do Not Duplicate' Keys: What It Really Means
That 'Do Not Duplicate' stamp is more of a request than a rule — except when it is not. Here is the difference.
Plenty of keys carry a small 'Do Not Duplicate' (DND) stamp, and it leaves people unsure whether they can legally get a spare. The short answer: for most standard keys, it is a request, not a legal restriction. But there is an important exception worth understanding.
What 'Do Not Duplicate' really means
A DND stamp on an ordinary key has no legal force. It was originally meant to discourage casual copying, but it does not change who legally owns or controls the key. Many locksmiths will still copy a standard DND key for the rightful owner.
When a key is genuinely restricted
The real control comes from restricted or patented key systems. These use protected keyways and require proof of authorization before a copy is made. They are common in offices, apartment buildings, and high-security settings — and that protection is exactly the point.
- Standard DND key — usually copyable for the owner
- Restricted/patented key — requires authorization and a specific blank
- High-security key — may need the original system provider
A better question than 'can I copy it?'
If you are worried about who has copies of your key, duplication is not really the issue — key control is. In that case rekeying or a restricted key system gives you far more control than a stamp ever could. A locksmith can tell you which path fits once they see the key.
