Information processing apparatus and method, information recording medium, and computer program

An information processing method for an information processing apparatus, comprising:

• calculating a hash value of a certificate stored in a first information recording medium and verifying the calculated hash value against a hash value stored in a content certificate corresponding to first content stored in the first information recording medium;
• and
• if the calculated hash value and the hash value stored in the content certificate coincide with each other, obtaining the first content stored in the first information recording medium and second content which is stored in a second information recording medium and which is usable together with the first content, and performing content playback processing by using the first content and the second content,
• wherein, when performing the content playback processing, identification information recorded in the first information recording medium is obtained from the first information recording medium, and content that is usable in association with the identification information is obtained as the second content from the second information recording medium so that the content playback processing is performed by using the first content and the second content,
• wherein the information processing apparatus constructs a virtual file system when performing the playback processing by using the first content and the second content, and the identification information is recorded, as a single file, in a directory in the first information recording medium which is not included when constructing the virtual file system, and the identification information is obtained from the first recording medium.

A computer readable storage medium having stored thereon computer program code, which, when executed, causes an information processing apparatus to perform content playback control processing comprising:

• calculating a hash value of a certificate stored in a first information recording medium and verifying the calculated hash value against a hash value stored in a content certificate corresponding to first content stored in the first information recording medium;
• and
• on the condition tat the calculated hash value and the hash value stored in the content certificate coincide wit each other, obtaining the first content stored in the first information recording medium and second content which is stored in a second information recording medium and which is usable together with the first content, and performing content playback processing by using the first content and the second content,
• wherein, when performing the content playback processing, identification information recorded in the first information recording medium or in the first content is obtained from the first information recording medium, and content that is usable in association with the identification information is obtained as the second content from the second information recording medium so that the content playback processing is performed by using the first content and the second content,
• wherein the information processing apparatus constructs a virtual file system when performing the playback processing by using the first content and the second content, and the identification information is recorded, as a single file, in a directory in the first information recording medium which is not included when constructing the virtual file system, and the identification information is obtained from the first recording medium.