Patent ID: 7290130

Claim:
A second information processing device for providing a copy of original information to the user and for communicating with a first information processing device, which connects to a local area network by way of an access control device for controlling connections with said local area network and Internet, said second information processing device connecting to said Internet and comprising: a memory section for storing in advance a second copy of original information held in said first information processing device, a communications unit to acquire a first check information relating to a first copy of original information from another second information processing device connecting to said Internet having said first copy of original information corresponding to said second copy of original information possessed by said memory section, a control unit to make a second check information relating to said second copy of original information possessed by said memory section, comparing said second check information with said acquired first check information, requesting the first information processing device to transmit the original information when the second check information and the first check information are not the same.