Patent ID: 6081794
Filing Date: 2000-06-27
Classification: G06F,G11B,H04L,H04N

Abstract:
A data copyright management method wherein:a primary user receives a copyrighted primary date which is encrypted by a first use permit key from a database;said primary user requests a key control center to distribute said first use permit key;said key control center distributes said first use permit key to said primary user;said primary user decrypts said encrypted copyrighted primary data to plaintext by using said first use permit key and performs primary utilization of the data;said primary user requests said key control center to distribute a second permit key;said key control center distributes said second use permit key to said primary user;said primary user edits said copyrighted primary data using said received second use permit key;said copyrighted primary data under editing is encrypted by using said second use permit key to be stored.