Aside from the "do not duplicate" warnings on restricted keys, lock makers also try to prevent their duplication by using contorted keyways—the space inside a lock that a key's inserted into ...

Three 3D-printed Schlage Primus keys. When lock maker Schlage imprinted the words "do not duplicate" across the top of the keys for their high-security Primus locks, they meant to create another ...

Five years ago his girlfriend could not find her key and was locked out of her apartment in New York at 2:00 A.M. She had no choice but to call a locksmith who charged her a lot of money to get in.