A digital cable network architecture includes hosts that include a receiver with a hash function generator that calculates hash values based on a hash function and data from memory blocks in the receiver. A policy file store contains policy files having a service provider section, a consumer section,...http://www.google.com.hk/patents/US6993132?utm_source=gb-gplus-share專利 US6993132 - System and method for reducing fraud in a digital cable network
