Patent ID: 8880878

Claim:
A content distribution storage system in which a plurality of node devices are connected via a network and are capable of transmitting and receiving a content to and from one another, the system comprising: a first transmission unit configured to transmit a special content to a first node device of the plurality of node devices, the special content comprising certificate revocation list information indicating a list of at least an invalid electronic certificate; a second transmission unit configured to transmit identification information for identifying the special content to a second node device of the plurality of node devices; and a third node device that is one of the plurality of node devices, the third node device comprising: a certificate obtaining unit configured to obtain an electronic certificate from a particular node device, the particular node device being one of the plurality of node devices, the electronic certificate being used to authenticate the particular node device; an identification information obtaining unit configured, based on the electronic certificate obtained by the certificate obtaining unit, to obtain the identification information of the special content comprising the certificate revocation list information corresponding to the electronic certificate obtained by the certificate obtaining unit, the identification information obtaining unit obtaining the identification information from one of the second node device and a node device to which the identification information is transferred from the second node device; and a special content obtaining unit configured to obtain the special content comprising the certificate revocation list information from one of the first node device and a node device which stores the special content associated with the identification information obtained by the identification information obtaining unit.