The data processing system is realizable by executing a step of ciphering contents keys used for decoding ciphered contents data by applying mutually different ciphering keys before storing ciphered contents keys in memory as header data of the corresponding contents data. One of the ciphered contents...http://www.google.com.hk/patents/US7131010?utm_source=gb-gplus-share專利 US7131010 - Data processing system, data processing method, data processing apparatus, and program providing medium
