Gw mau tau Do Not Duplicate Key dari Sosi. Jelasin dalam bahasa sunda

A Do Not Duplicate key is one which has been stamped do not duplicate by a locksmith or manufacturer as a passive deterrent to prevent a retail key cutting service from duplicating a key without authorization or without contacting the locksmith or manufacturer who originally cut the key. More importantly, this is a control system for whoever is the owner of the key, such as a maintenance person or security guard, to identify keys that should not be freely distributed or used without authorization. Though it is intended to prevent unauthorized key duplication, copying restricted keys remains a common security problem.  There is no direct legal implication in the US for soméone that copies a key that is stamped do not duplicate (unless it is a government owned key), but there are patent restrictions on some key designs (see "restricted keys").

United States Code 18 USC Sec. 1704  déals with United States Post Office keys, and 18 USC Sec. 1386  déals with United States Department of Defense keys.