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Permanently Encoded Magnetic Cards for Security Systems, Access Control, Inventory Control, Revenue Control, Identification, and Data Entry to Electronic Processing Equipment; Security Systems for Access Control Comprising Encoded Magnetic Cards, Card Reader Terminal, Electronics Board for Responding to Signal from Card Reader and Signaling an Access Relay, and an Access Relay Responsive to Signal from Electronics Board; Security System for Access Control, Identification, Revenue Control and Data Acquisition for Management, Personnel and Materials Control Comprising Encoded Magnetic Cards, Card Reader Terminals, Access Relays, a Printer and a Programmer and a Central Programmable Microprocessor Unit for Responding to a Signal from a Card Reader and for Signaling to the Printer, Programmer and an Access Relay; and a Security System, for Access Control, Identification, Revenue Control and Data Acquisition from Management, Personnel and Materials Control Comprising Encoded Magnetic Cards, Card Reader Terminals, Access Relays and a Computer Interface Electronics Unit for Responding to Signal from a Card Reader, for Communicating Information to a Central Computer and for Signaling to an Access Relay