Some manufactures use restrictions to reduce unauthorized key duplication.
Knowing that your house or car key can be duplicated easily can be frightening. Therefore, key manufactures have put in certain key duplication restrictions that helps reduce illegal key duplication.
One way they do this is by having restricted keys blanks. Having a restricted key blank enables a manufacturer to create a controlled amount of sales and distribution.
Protected by a patent, restricted keys bans other manufacturers from engaging in unlawful key blank production.
When seeking the services of a professional locksmith, one will be required to provide an ID if the key has a restricted key blank. This helps ensure the highest level of security.
Some manufactures have gone ahead and put special in-laid features in restricted keys such as small computer chips, magnets, different types of metal, or even prevented duplication all together.
Another mechanism manufacturers use to avoid key duplication is creating “Do Not Duplicate” (DND) keys. The key is stamped “do not duplicate” on its surface.
This helps discourage unlawful key cutting and acts more like a key control system. A professional locksmith will not duplicate such a key without getting in contact with the manufacturer who originally made the key.
Though this mechanism is supposed to discourage key duplication, the unauthorized copying of DND keys by individuals is still a security problem.
Having keys with movable mechanisms or electronic components on the key blank offers the best security and are difficult or impossible to duplicate.