A secure electronic data module containing a monolithic semiconductor chip of the type having a memory that is protected by a combination of hardware and software mechanisms such that unauthorized access to the data stored in the memory is prevented. The monolithic semiconductor chip comprises a plurality...http://www.google.es/patents/US5998858?utm_source=gb-gplus-sharePatente US5998858 - Microcircuit with memory that is protected by both hardware and software
Microcircuit with memory that is protected by both hardware and software
