Patent ID: 8095790

Claim:
An information processing apparatus comprising: a recording medium interface; a data processor; and a memory device which stores instructions, which when executed by the data processor, cause the data processor to operate with the recording medium interface to: (a) obtain first encrypted data from an information recording medium, said first encrypted data being stored in one of a plurality of content management units associated with key acquisition information; (b) generate a cryptographic key based on: (i) said key acquisition information; and (ii) information which can only be obtained in response to an execution of a designated licensed program; (c) decrypt said obtained first encrypted data to form a first subsequent data, said obtained first encrypted data being decrypted based on said generated cryptographic key; (d) thereafter, obtain or generate, using said formed first subsequent data, a second subsequent data, said second subsequent data being: (i) non-encrypted data; (ii) obtained or generated without decrypting said second subsequent data; and (iii) different from any other data stored or generated in association with said information processing apparatus or said information recording medium; (e) encrypt said second subsequent data to form a second encrypted data, said second subsequent data being encrypted based on said generated cryptographic key, and wherein said first encrypted data, said second encrypted data, said first subsequent data and said second subsequent data are each different from each and every key used in association with said first encrypted data, said second encrypted data, said first subsequent data and said second subsequent data for encryption or decryption; and (f) record the second encrypted data in a data management file; and (g) set the data management file in a directory for each of a plurality of user.