"The new ML System is a patent-pending Key Control product. It is not high security and does not offer increased pick or drill resistance." This is the opening sentence from a September 2003 update of ...

Readers of The Secret will recognize Charles Haanel, author of 1916's The Master Key System (now conveniently in the public domain), as the source that Gladstone (The Twelve), Greninger, and ...

Losing a grandmaster key to a campus building involves expensive refitting of all locks affected and the replacement of master and submaster keys that can cost upward to a million dollars or more.