Patent ID: 8261096

Claim:
A non-transitory information recording medium comprising: (a) a plurality of different, individual content management units, including encryptable data, the content management units including a first content management unit including first encryptable data which includes: (i) at least one content file, the content file including at least one of a data file reproducible by an information processing apparatus and a program file executable by the information processing apparatus; and (ii) at least one of a content reproduction section specification file, a content reproduction processing program file, an application index file, and an application execution file; (b) a plurality of different, individual unit keys including a first unit key, each one of said plurality of unit keys associated with at least one of the content management units, the first encryptable data of the first content management being encrypted using the first unit key; and (c) a plurality of instructions which when executed by the information processing apparatus, cause the information processing apparatus, for one of the plurality of content management units, to: (i) determine whether the encryptable data of said content management unit includes the first encryptable data of the first content management unit; and (ii) if the encryptable data of the content management unit includes the first encryptable data of the first content management unit: (A) using the first unit key, decrypt the first encrypted data of the first content management unit; and (B) after decrypting the first encrypted data of the first content management unit, cause at least one of: (1) the data file of the first content management unit to be reproduced; and (2) the program file of the first content management unit to be executed.