When you’re handed a key stamped with “Do Not Duplicate,” it often creates a sense of reassurance. The wording sounds official and gives the impression that no one else can make a copy without permission. For homeowners, landlords, and business owners, that message can feel like an added layer of security.
In reality, the situation is more complicated. A “Do Not Duplicate” stamp does not always prevent a key from being copied, and understanding the difference between a warning label and true access control is important if you want better security for your property.