A trusted time infrastructure system provides time stamps for electronic documents from a local source. The system comprises a trusted master clock, a trusted local clock, and a network operations center. The trusted master clock and network operations center are located within secure environments controlled...http://www.google.es/patents/US20020056042?utm_source=gb-gplus-sharePatente US20020056042 - System and methods for generating trusted and authenticatable time stamps for electronic documents
System and methods for generating trusted and authenticatable time stamps ...
