Method and apparatus are disclosed for controlling access to information borne by information records installed in information recorders, which information recorders constitute a part of at least one digital computer system. The digital computer system is an unmodified general purpose digital computer,...http://www.google.fr/patents/US4907268?utm_source=gb-gplus-shareBrevet US4907268 - Methods and apparatus for controlling access to information processed a multi-user-accessible digital computer
Methods and apparatus for controlling access to information processed a ...
