Information processing device, information storage device, server, information processing system, information processing method, and program

An information processing device comprising:

• a data processing unit which is equipped with a medium storing an encrypted content encrypted using a title key and has a data processing unit that executes decryption processing of the encrypted content,
• wherein the data processing unit
• acquires, from the medium, a converted title key obtained by converting a title key which is an encryption key to be applied to the decryption of the encrypted content, and a user token obtained by converting binding secret information to be applied to calculate the title key from the converted title key,
• generates an authentication key on the basis of user identification information acquired by input processing through an input unit or read-out processing from a memory,
• calculates the binding secret information by computation processing between the user token and the authentication key,
• calculates the title key from the converted title key by applying the calculated binding secret information, and
• executes the decryption processing of the encrypted content by applying the calculated title key.

An information processing system comprising:

• an information storage device that stores an encrypted content, a converted title key obtained by converting a title key which is a decryption key of the encrypted content, and a user token obtained by converting binding secret information to be applied to calculate the title key from the converted title key;
• and
• an information processing device that executes reproduction processing of the encrypted content,
• wherein the information processing device
• acquires the converted title key and the user token from the information storage device,
• generates an authentication key on the basis of user identification information that is acquired by input processing through an input unit or read-out processing from a memory,
• calculates the binding secret information by computation processing between the user token and the authentication key,
• calculates the title key from the converted title key by applying the calculated binding secret information, and
• executes the decryption processing of the encrypted content by applying the calculated title key.

An information processing method which is executed in an information storage device, the information storage device comprising:

• a storage unit that stores an encrypted content, a converted title key obtained by converting a title key which is an encryption key to be applied to decryption of the encrypted content, and a user token obtained by converting binding secret information to be applied to calculate the title key from the converted title key;
• and
• a data processing unit that controls access of an external device to the storage unit,
• wherein the data processing unit allows an external device having an access right to the storage unit being confirmed therein to read out the user token.

An information processing method of decrypting and reproducing a content, stored in a medium, in an information processing device comprising:

• a data processing unit which is equipped with a medium storing an encrypted content encrypted using a title key and has a data processing unit that executes decryption processing of the encrypted content,
• wherein the data processing unit
• acquires, from the medium, a converted title key obtained by converting a title key which is an encryption key to be applied to the decryption of the encrypted content, and a user token obtained by converting binding secret information to be applied to calculate the title key from the converted title key,
• generates an authentication key on the basis of user identification information acquired by input processing through an input unit or read-out processing from a memory,
• calculates the binding secret information by computation processing between the user token and the authentication key,
• calculates the title key from the converted title key by applying the calculated binding secret information, and
• executes the decryption processing of the encrypted content by applying the calculated title key.

A program causing an information storage device to execute information processing, the information storage device comprising:

• a storage unit that stores an encrypted content, a converted title key obtained by converting a title key which is an encryption key to be applied to decryption of the encrypted content, and a user token obtained by converting binding secret information to be applied to calculate the title key from the converted title key;
• and
• a data processing unit that controls access of an external device to the storage unit,
• wherein the program causes the data processing unit to execute processing of allowing an external device having an access right to the storage unit being confirmed therein to read out the user token.

A program causing an information processing device to decrypt and reproduce a content stored in a medium, the information processing device comprising:

• a data processing unit which is equipped with a medium storing an encrypted content encrypted using a title key and has a data processing unit that executes decryption processing of the encrypted content,
• wherein the program causes the data processing unit to execute
• processing of acquiring, from the medium, a converted title key obtained by converting a title key which is an encryption key to be applied to the decryption of the encrypted content, and a user token obtained by converting binding secret information to be applied to calculate the title key from the converted title key,
• processing of generating an authentication key on the basis of user identification information acquired by input processing through an input unit or read-out processing from a memory,
• processing of calculating the binding secret information by computation processing between the user token and the authentication key,
• processing of calculating the title key from the converted title key by applying the calculated binding secret information, and
• decryption processing of the encrypted content by applying the calculated title key.