Patent ID: 7853532

Claim:
A data communication system, comprising: a communication terminal; and a server connected with the communication terminal via a network, the server comprising a server communication unit that issues updating license information to the communication terminal, the updating license information including condition information for at least one usage function to use content, the communication terminal comprising a client module that obtains license information, and a processing device that uses the content under condition information defined in the license information, wherein, when the client module is updated by an updating module to add the at least one usage function and the condition information defined in the license information does not include the condition information for the at least one usage function, the server communication unit issues the updating license information including the condition information for the at least one usage function, and the client module reads a version indicator of the license information, obtains the updating license information, based on the version indicator of the license information, and uses the content under both the condition information defined in the updating license information for the at least one usage function and the condition information defined in the license information.