An information processing apparatus, wherein the information processing apparatus is configured to receive encrypted content, encrypted with a title key being an encryption key for a specific title, the title key and a encrypted content signature file corresponding to the encrypted content, wherein the information processing apparatus comprises: a data processing unit which executes processing for decoding and reproducing the encrypted content, wherein the data processing unit executes processing for determining whether or not the content can be reproduced by applying the encrypted content signature file 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 being 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, wherein 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, the data processing unit further refers to a revocation list which records therein information on invalidation of the encrypted content signature issuer certificate and performs the processing for decoding and reproducing the encrypted content under a condition that it is confirmed that an identifier of the encrypted content signature issuer certificate is not registered in the revocation list. a data processing unit which executes processing for decoding and reproducing the encrypted content, wherein the data processing unit executes processing for determining whether or not the content can be reproduced by applying the encrypted content signature file 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 being an apparatus which generates the encrypted content signature file, 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 being 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, 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, refers to a revocation list which records therein information on invalidation of the encrypted content signature issuer certificate and performs the processing for decoding and reproducing the encrypted content under a condition that it is confirmed that an identifier of the encrypted content signature issuer certificate is not registered in the revocation list.