Information processing apparatus, information processing method and program

An information processing apparatus comprising:

• a data processing circuitry configured to record a content into a medium;
• said medium having
• a general purpose area in which encrypted contents and utilization controlling information corresponding to the encrypted contents are stored, and
• a protected area configured from a plurality of blocks to which access limitation is set and which include a title key storage block in which an encryption key for decrypting the encrypted contents and validity period information indicative of content utilization permission periods applied to application contents of the encryption key are stored and a status storage block in which date information upon content first-time reproduction is stored as content-corresponding status information, each of the title key storage block and the status storage block of the protected area having access limitation set separately per each of a plurality of content servers associated with the information processing apparatus;
• said data processing circuitry configured to
• record an encrypted content and utilization controlling information corresponding to the encrypted content into the general purpose area,
• record an encryption key for decrypting the encrypted content recorded in the general purpose area into the title key storage block,
• set a content-corresponding status information recording area for recording the date information upon first-time reproduction of the encrypted content recorded in the general purpose area as the content-corresponding status information to the status storage block, the block in which the encryption key is stored is a block access to which is permitted based on an access privilege decision by the medium, and upon a data recording process into the block, the data processing circuitry transmits a certificate of the information processing apparatus to the medium and carries out a data recording process into the block taking it as a condition that it is confirmed by the access privilege decision process by the medium that the information processing apparatus has a privilege of a data recording process.

An information processing method executed by an information processing apparatus which executes a content reproduction process and has a data processing circuitry configured to reproduce contents stored in a medium, the information processing method comprising:

• storing, by the data processing circuitry, encrypted contents and utilization controlling information corresponding to the encrypted contents into a general purpose area of the medium;
• setting access limitations of a title key storage block and a status storage block separately per each of a plurality of content servers associated with the information processing apparatus, both the title key storage block and the status storage block being parts of a protected area of the medium;
• storing an encryption key for decrypting the encrypted contents and validity period information indicative of content utilization permission periods applied to application contents of the encryption key into the title key storage block of the protected area;
• storing date information upon content first-time reproduction as content-corresponding status information into the status storage block of the protected area;
• acquiring from the title key storage block, upon a content reproduction process, the validity period information indicative of the content utilization permission period determined in response to the date information upon the content first-time reproduction from the title key storage block;
• and
• deciding permission or inhibition of content reproduction based on comparison between the acquired validity period information and current date information, the validity period information recorded in the title key storage block is set taking the date information upon the content first-time reproduction recorded in the status storage block as a reference date, the title key storage block is a block access to which is permitted based on an access privilege decision by the medium, and the validity period information recorded in the title key storage block is information which is written and updated by a server which has privilege of a data writing process into the title key storage block.

An information processing method executed by an information processing apparatus which carries out a content recording process into a medium, the information processing method comprising:

• recording, by a processor, an encrypted content and utilization controlling information corresponding to the encrypted content into a general purpose area of the medium;
• setting access limitations of a title key storage block and a status storage block separately per each of a plurality of content servers associated with the information processing apparatus, both the title key storage block and the status storage block being parts of a protected area of the medium;
• recording an encryption key for decrypting the encrypted content and validity period information indicative of content utilization permission periods applied to application contents of the encryption key into the title key storage block of the protected area;
• and
• setting a content-corresponding status information recording area for recording date information upon a first-time reproduction of the encrypted content recorded in the general purpose area as content-corresponding status information into the status storage block of the protected area, the block in which the encryption key is stored is a block access to which is permitted based on an access privilege decision by the medium, and upon a data recording process into the block, the data processing circuitry transmits a certificate of the information processing apparatus to the medium and carries out a data recording process into the block taking it as a condition that it is confirmed by the access privilege decision process by the medium that the information processing apparatus has a privilege of a data recording process.

A non-transitory computer readable medium storing computer readable program thereon that, when executed by an information processing apparatus which executes a content reproduction process and has a data processing circuitry configured to reproduce contents stored in a medium, causes the information processing apparatus to execute:

• a process for storing, by the data processing circuitry, encrypted contents and utilization controlling information corresponding to the encrypted contents into a general purpose area of the medium;
• a process for setting access limitations of a title key storage block and a status storage block separately per each of a plurality of content servers associated with the information processing apparatus, both the title key storage block and the status storage block being parts of a protected area of the medium;
• a process for storing an encryption key for decrypting the encrypted contents and validity period information indicative of content utilization permission periods applied to application contents of the encryption key into the title key storage block of the protected area;
• a process for storing date information upon content first-time reproduction as content-corresponding status information into the status storage block of the protected area;
• a process for acquiring from the title key storage block, upon a content reproduction process, the validity period information indicative of the content utilization permission period determined in response to the date information upon the content first-time reproduction from the title key storage block;
• and
• a process for deciding permission or inhibition of content reproduction based on comparison between the acquired validity period information and current date information, the validity period information recorded in the title key storage block is set taking the date information upon the content first-time reproduction recorded in the status storage block as a reference date, the title key storage block is a block access to which is permitted based on an access privilege decision by the medium, and the validity period information recorded in the title key storage block is information which is written and updated by a server which has privilege of a data writing process into the title key storage block.

A non-transitory computer readable medium storing computer readable program thereon that, when executed by an information processing apparatus which carries out a content recording process into a medium, causes the information processing apparatus to execute:

• a process for recording, by a processor, an encrypted content and utilization controlling information corresponding to the encrypted content into a general purpose area of the medium;
• a process for setting access limitations of a title key storage block and a status storage block separately per each of a plurality of content servers associated with the information processing apparatus, both the title key storage block and the status storage block being parts of a protected area of the medium;
• a process for recording an encryption key for decrypting the encrypted content and validity period information indicative of content utilization permission periods applied to application contents of the encryption key into the title key storage block of the protected area;
• and
• a process for setting a content-corresponding status information recording area for recording date information upon a first-time reproduction of the encrypted content recorded in the general purpose area as content-corresponding status information into the status storage block of the protected area, the block in which the encryption key is stored is a block access to which is permitted based on an access privilege decision by the medium, and upon a data recording process into the block, the data processing circuitry transmits a certificate of the information processing apparatus to the medium and carries out a data recording process into the block taking it as a condition that it is confirmed by the access privilege decision process by the medium that the information processing apparatus has a privilege of a data recording process.