INFORMATION RECORDING DEVICE, INFORMATION RECORDING METHOD, INFORMATION REPRODUCTION DEVICE, INFORMATION REPRODUCTION METHOD, INFORMATION RECORDING PROGRAM, INFORMATION REPRODUCTION PROGRAM, INFORMATION RECORDING MEDIUM, AND RECORDING MEDIUM

摘要

There is provided an information recording medium capable of smooth execution of processing without requiring calculation at each encryption key application switching moment. A hard disc (1) contains AV stream information (3) containing encryption information obtained by performing encryption while modifying the encryption key at the boundary of CBC block which is different from the application GOP and a key modification flag (11) containing key modification information indicating whether a plurality of encryption keys are required for decrypting the I picture contained in the application GOP in the aforementioned encrypted information.