Portable data medium with integrated memories is used for various purposes, for example for storing personal medical data or for storing amounts of money. The danger exists that if the data medium is lost or stolen, data or, respectively, amounts of money, are irretrievably lost to the legitimate user....http://www.google.co.uk/patents/US5902981?utm_source=gb-gplus-sharePatent US5902981 - Method and system for securing and restoring data of a portable chip-card if lost or stolen
