Patent ID: 7076668
Filing Date: 2006-07-11
Classification: G06F,G11B,H04L

Abstract:
1. A data usage controlling apparatus that (1) reads a type 1 key from a storage unit and (2) decrypts the encrypted condition information using the type 2 key, and (3) controls usage of the read main data based on the condition information, the data usage controlling apparatus comprising: first updating means for updating the condition information in accordance with usage of the read main data; generating means for generating a new type 2 key in accordance with the usage of the read main data; first encrypting means for encrypting the updated condition information using the new type 2 key and replacing the encrypted condition information on the recording medium with the encrypted updated condition information; second updating means for updating the type 1 key in the storage unit in accordance with the usage of the read main data; and second encrypting means for encrypting the new type 2 key using the updated type 1 key and replacing the encrypted type 2 key on the recording medium with the encrypted new type 2 key.