Abstract: A system for distributing a license key for upgrading an access control system. A portable token that includes first and second identifiers, such as a visible serial number and a concealed control number that can be derived from the serial number. The access control system is identified by a third identifier, such as a MAC address. A license server generates a license key from the first, second and third identifiers that is operative to allow access to software features that are resident on the access control system without the need for an Internet connection.

Abstract: Provided is a central access control apparatus in which a CPU board, an intermediate board and a touch panel board are integrally formed. The CPU board includes a memory chip that stores identification information, and a CPU chip that determines whether user information from a user corresponds to the identification information and controls the opening/closing of a door. The intermediate board includes a relay, a capacitor and a resistor. The touch panel board includes a touch panel that displays the user information and receives input information. Thus, the central access control apparatus prevents an unauthorized person from accessing thereto, making it possible to prevent identification information from being undesirably modified and leaked.