Information processing apparatus, information storage apparatus, information processing system, and information processing method and program

An information processing apparatus comprising:

• a data processing unit which executes processing for providing encrypted content to a user device,
• wherein the data processing unit executes processing for determining whether or not the content can be provided by applying an encrypted content signature file set corresponding to encrypted content,
• wherein the encrypted content signature file is a file which stores thereon
• information on issue date of the encrypted content signature file and
• an encrypted content signature issuer certificate with a public key of an encrypted content signature issuer as an apparatus which generates the encrypted content signature file,
• wherein in the processing for determining whether or not the content can be provided, the data processing unit
• compares expiration date of the encrypted content signature issuer certificate recorded in the encrypted content signature issuer certificate with the information on issue date of the encrypted content signature file,
• executes the processing for determining whether or not the content can be provided with reference to a revocation list which records therein information on invalidation of the encrypted content signature issuer certificate when it is confirmed that the expiration date of the encrypted content signature issuer certificate is not before the issue date of the encrypted content signature file, and
• performs the processing for determining whether or not the content can be provided with reference to information on the expiration date of the encrypted content signature issuer certificate when it is confirmed that the expiration date of the encrypted content signature issuer certificate is before the issue date of the encrypted content signature file.

An information processing system comprising:

• a user device which executes processing for reproducing content;
• a content provider which executes processing for providing the content to the user device;
• and
• an encrypted content signature issuer which executes processing for providing an encrypted content signature file to the content provider,
• wherein the content provider sends content hash list collections including hash values based on configuration data of the content and a content encryption key or a hash value of the encryption key to the encrypted content signature issuer,
• wherein the encrypted content signature issuer generates signature data for data as a target of the signature, namely data including the content hash list collections, the hash value of the content encryption key, and information on date on which the encrypted content signature file is generated, generates an encrypted content signature file including the generated signature data and the content hash list collections, and sends the encrypted content signature file to the content provider,
• wherein the content provider executes processing for determining whether or not the content can be provided by applying the information on date on which the encrypted content signature file is generated, and
• wherein the user device executes processing for determining whether or not the content can be reproduced by applying the information on date on which the encrypted content signature file is generated.

An information storage apparatus comprising:

• a storage unit which stores encrypted content and an encryption key to be applied to decoding of the encrypted content,
• wherein the storage unit includes a protected area, which stores thereon a converted encryption key as conversion data of the encryption key, for which an access restriction is set, and a general purpose area which stores thereon the encrypted content,
• wherein the general purpose area stores thereon an encrypted content signature file set corresponding to the encrypted content,
• wherein the encrypted content signature file is a file which stores thereon
• information on issue date of the encrypted content signature file and
• an encrypted content signature issuer certificate with a public key of an encrypted content signature issuer as an apparatus which generates the encrypted content signature file, and
• wherein a reproduction apparatus which executes processing for reading and reproducing the encrypted content from the storage unit is made to determine whether or not the content can be reproduced by applying the information on issue date of the encrypted content signature file.

An information processing method implemented in an information processing apparatus,

• wherein the information processing apparatus includes a data processing unit which executes processing for decoding and reproducing encrypted content,
• wherein the data processing unit executes processing for determining whether or not the content can be reproduced by applying an encrypted content signature file set corresponding to the content to be reproduced,
• wherein the encrypted content signature file is a file which stores thereon
• information on issue date of the encrypted content signature file and
• an encrypted content signature issuer certificate with a public key of an encrypted content signature issuer as an apparatus which generates the encrypted content signature file,
• wherein in the processing for determining whether or not the content can be reproduced, the data processing unit
• compares expiration date of the encrypted content signature issuer certificate recorded in the encrypted content signature issuer certificate with the information on issue date of the encrypted content signature file,
• does not perform processing for decoding and reproducing the encrypted content when the expiration date of the encrypted content signature issuer certificate is before the issue date of the encrypted content signature file, and
• performs the processing for decoding and reproducing the encrypted content only when it is confirmed that the expiration date of the encrypted content signature issuer certificate is not before the issue date of the encrypted content signature file.

An information processing method implemented in an information processing apparatus,

• wherein the information processing apparatus includes a data processing unit which executes processing for providing encrypted content to a user device,
• wherein the data processing unit executes processing for determining whether or not the content can be provided by applying an encrypted content signature file set so as to correspond to the encrypted content,
• wherein the encrypted content signature file is a file which stores thereon
• information on issue date of the encrypted content signature file and
• an encrypted content signature issuer certificate with a public key of an encrypted content signature issuer as an apparatus which generates the encrypted content signature file,
• wherein in the processing for determining whether or not the content can be provided, the data processing unit
• compares expiration date of the encrypted content signature issuer certificate recorded in the encrypted content signature issuer certificate with the information on issue date of the encrypted content signature file,
• executes the processing for determining whether or not the content can be provided with reference to a revocation list which records therein information on invalidation of the encrypted content signature issuer certificate when it is confirmed that the expiration date of the encrypted content signature issuer certificate is not before the issue date of the encrypted content signature file, and
• performs the processing for determining whether or not the content can be provided with reference to information on the expiration date of the encrypted content signature issuer certificate when it is confirmed that the expiration date of the encrypted content signature issuer certificate is before the issue date of the encrypted content signature file.

A program which causes an information processing apparatus to execute information processing,

• wherein the information processing apparatus includes a data processing unit which executes processing for decoding and reproducing encrypted content,
• wherein the program causes the data processing unit to execute processing for determining whether or not the content can be reproduced by applying an encrypted content signature file set corresponding to the content to be reproduced,
• wherein the encrypted content signature file is a file which stores thereon
• information on issue date of the encrypted content signature file and
• an encrypted content signature issuer certificate with a public key of an encrypted content signature issuer as an apparatus which generates the encrypted content signature file,
• wherein in the processing for determining whether or not the content can be reproduced, the program causes the data processing unit to
• execute processing for comparing expiration date of the encrypted content signature issuer certificate recorded in the encrypted content signature issuer certificate with the information on issue date of the encrypted content signature file,
• not perform processing for decoding and reproducing the encrypted content when the expiration date of the encrypted content signature issuer certificate is before the issue date of the encrypted content signature file, and
• perform the processing for decoding and reproducing the encrypted content only when it is confirmed that the expiration date of the encrypted content signature issuer certificate is not before the issue date of the encrypted content signature file.

A program which causes an information processing apparatus to execute information processing,

• wherein the information processing apparatus includes a data processing unit which executes processing for providing encrypted content to a user device,
• wherein the program causes the data processing unit to execute processing for determining whether or not the content can be provided by applying an encrypted content signature file set so as to correspond to the encrypted content,
• wherein the encrypted content signature file is a file which stores thereon
• information on issue date of the encrypted content signature file and
• an encrypted content signature issuer certificate with a public key of an encrypted content signature issuer as an apparatus which generates the encrypted content signature file,
• wherein in the processing for determining whether or not the content can be provided, the program causes the data processing unit to
• compare expiration date of the encrypted content signature issuer certificate recorded in the encrypted content signature issuer certificate with the information on issue date of the encrypted content signature file,
• execute the processing for determining whether or not the content can be provided with reference to a revocation list which records therein information on invalidation of the encrypted content signature issuer certificate when it is confirmed that the expiration date of the encrypted content signature issuer certificate is not before the issue date of the encrypted content signature file, and
• perform the processing for determining whether or not the content can be provided with reference to information on the expiration date of the encrypted content signature issuer certificate when it is confirmed that the expiration date of the encrypted content signature issuer certificate is before the issue date of the encrypted content signature file.