| 摘要 |
An arrangement capable for preventing secret information, such as private data and contents that are copyrighted or whose utilizations are limited, in a local network from being leaked or distributed outside the local network. A plurality of identification information of a communication destination device are acquired at different data processing levels. For example, identification information acquired by a data processing in a physical layer or data link layer level in an OSI reference model and identification information acquired by a data processing in a layer level higher than a network layer level are received and compared. As at least one of such identification information, data produced by an encryption processing based on secret information shared with a communication source device or data produced by hash values shared with the communication source device is received. In this way, the plurality of identification information are compared, and it is determined, based on the comparison result, whether the communication destination device is a device connected to the same local network.
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