INFORMATION INPUT/OUTPUT SYSTEM, KEY CONTROLLER AND USER DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a system for preventing unauthorized copy of contents by exactly judging whether or not equipment is the one the drive of which is invalidated by a host.

SOLUTION: An information input/output system inputs/outputs information between the outside and a user device consisting of a reader/writer 400 and an encryption device 500. A recorder 200 safely outputs invalidation information regarding equipment the use of which is invalidated, the reader/writer 400 inputs/outputs the information between the outside and the encryption device 500, the encryption device 500 safely receives the invalidation information from the recorder via the reader/writer 400, judges whether or not the reader/writer 400 is the invalidated equipment based on the received invalidation information and when the reader/writer 400 is judged as the invalidated equipment, suppresses input/output of the information with the outside via the reader/writer 400.

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