| 摘要 |
<p>PURPOSE:To limit a geographical and a spatial positional range in which a specific data is used by allowing a communication node to discriminate the acceptability of data transit. CONSTITUTION:A server 302 supplies a data to a communication node 303 and a client 301. In this case, a transit enable radio node ID is read from an ID management table with respect to the supplied data and the ID is added to the data to be fed to generate the data to be sent. When the communication node 303 detects a communication data from the server 302 at a communication unit 425, at first the communication data is received. Then an ID of its own radio node is read from a storage device 423 and when the same node as that of its own radio node is in existence in transit enable radio nodes ID in the communication data to be received, the transit permission of the communication data is sent. Then a radio communication unit 424 sends a communication data to the client 301. Thus, the position range is limited and leakage of secrecy relating to the data to an external device is avoided.</p> |
