Electronic systems, such as automobile radios, portable and other computing devices, and global positioning system receivers, often require that a correct security code be inputted from a small memory card that is removably inserted into a card slot of the system before the system is rendered operable...http://www.google.co.uk/patents/US7350714?utm_source=gb-gplus-sharePatent US7350714 - Use of small electronic circuit cards with different interfaces in an electronic system
