Īssociated Locksmiths of America (ALOA), an internationally recognized as the North American association for locksmiths, considers such stamps to be ineffective at providing security. The State of California prohibits locksmiths from copying keys marked "Do Not Duplicate" or "Unlawful to Duplicate", provided the key originator's company name and telephone number are included on the key. Some blanks are made only in small volumes and are not widely available. Some key blank manufacturers strictly restrict the sale of their own blanks. In other territories, they are perfectly legal to duplicate. Once a patented or registered design has expired, it is no longer legally protected from unauthorised duplication, however the license agreement may continue to restrict the distributor, and some trade organisations have ethical standards that prevent members from duplicating such keys. In many territories, keys stamped with "Do not duplicate" or "It is unlawful to duplicate this key" are protected from unauthorised duplication by patent or registered design and the dealers (often locksmiths) being conditionally licensed to distribute the keys by the owner of the design (the manufacturer). The profile of the key bow, or the large, flat end, is often characteristic of an individual manufacturer. Blanks are typically stocked by locksmiths for duplicating keys. ![]() Key blanks can be stamped with a manufacturer name, end-user logo or with a phrase, the most commonly seen being 'Do not duplicate'. Do not duplicate, or 'DND' keys are stamped with the phrase 'Do Not Duplicate', and are intended as a suggestion to stop people from making copies of a specific key. The blank has a specific cross-sectional profile to match the keyway in a corresponding lock cylinder. Keyblanks pre-stamped with various imprints to discourage key duplication.Ī key blank (sometimes spelled keyblank) is a key that has not been cut to a specific bitting.
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