| 摘要 |
PROBLEM TO BE SOLVED: To prevent unauthorized operation of a maintenance terminal attached to a KARAOKE (orchestration without lyrics) system. SOLUTION: A maintenance terminal 30 executes a credit examining means, reads a terminal ID and an activation log from a performance terminal 20, and transmits them to a host device 10 by communication. The host device 10 analyzes the terminal ID and the activation log, judges authority, and transmits the result to the maintenance terminal 30 by communication. The maintenance terminal 30 receives information indicating that the performance terminal 20 is authorized or unauthorized, and the execution of a maintenance service such as a data copy means and a permission substitute means is validated or invalidated. In another constitution, the host device 10 transmits a propriety list to which continuous use permission is applied decided for each performance terminal 20 to the maintenance terminal 30 in a proper chance of communication. The maintenance terminal 30 confirms the propriety list to which the continuous use permission is applied for the terminal ID read from the performance terminal 20, and the execution of the maintenance service is validated or invalidated according to the appropriateness or inappropriateness of the result. |
