Information processing apparatus, information processing method and program

An information processing method, comprising:

• in an information processing apparatus:
• reproducing a plurality of encrypted content stored in a medium, wherein the medium comprises:
• a general purpose area configured to store the plurality of encrypted content and utilization controlling information corresponding to the plurality of encrypted content;
• and
• a protected area that comprises a plurality of blocks to which access limitation is set, wherein a block of the plurality of blocks is configured to store an encryption key for decryption of the plurality of encrypted content;
• acquiring a first utilization controlling information corresponding to a first content of the plurality of encrypted content from the general purpose area;
• determining, based on recorded data of the acquired first utilization controlling information, whether validity period information indicative of a content utilization permission period for the first content is to be acquired from the first utilization controlling information or from the block that is configured to store the encryption key,
• wherein the recorded data of the first utilization controlling information comprises a decision bit, and wherein a value of the decision bit is based on which validity of the validity period information recorded in the block configured to store the encryption key is determined;
• acquiring the validity period information from the first utilization controlling information or from the block based on the value of the decision bit,
• wherein the validity period information is acquired from the first utilization controlling information based on a determination that the validity period information for the first content is set singly with respect to content other than the first content of the plurality of encrypted content;
• and
• based on a comparison between the acquired validity period information and current date information:
• determining whether to provide access to the encryption key stored in the protected area;
• and
• reproduce the first content based on the encryption key.

A non-transitory computer-readable medium having stored thereon computer-readable instructions for causing a computer to execute operations, the operations comprising:

• reproducing a plurality of encrypted content stored in a medium, wherein the medium comprises:
• a general purpose area configured to store the plurality encrypted content and utilization controlling information corresponding to the plurality of encrypted content;
• and
• a protected area that comprises a plurality of blocks to which access limitation is set, wherein a block of the plurality of blocks is configured to store an encryption key for decryption of the plurality of encrypted content;
• acquiring a first utilization controlling information corresponding to a first content of the plurality of encrypted content from the general purpose area;
• determining, based on recorded data of the acquired first utilization controlling information, whether validity period information indicative of a content utilization permission period for the first content is to be acquired from the first utilization controlling information or from the block that is configured to store the encryption key,
• wherein the recorded data of the first utilization controlling information comprises a decision bit, and wherein a value of the decision bit is based on which validity of the validity period information recorded in the block configured to store the encryption key is determined;
• acquiring the validity period information from the first utilization controlling information or from the block based on the value of the decision,
• wherein the validity period information is acquired from the first utilization controlling information, based on a determination that the validity period information for the first content is set singly with respect to content other than the first content of the plurality of encrypted content;
• and
• based on a comparison between the acquired validity period information and current date information:
• determining whether to provide access to the encryption key stored in the protected area;
• and
• reproduce the first content based on the encryption key.