| 摘要 |
In the event that an electronic apparatus having a security function is forcibly put into an inoperable state because electric power is shut off once by an operation equivalent to theft, the inoperable state can be canceled by using a code notified by the dealer by telephone, without carrying the electronic apparatus into its dealer. After electric power is supplied again, the vehicle-mounted compact disc (abbreviated as CD) reproduction apparatus is used to play back a CD, and its TOC information is used as a judgment identification code C 1 . When the code C 1 is identical to the authorized identification code A 21 , the electronic apparatus is made operable. In order to cancel the inoperable state after the number of inconsistencies becomes 10 or more, the individual code A 22 of an EEPROM 21 is indicated and notified to the dealer. The dealer carries out calculation by using the individual code A 22 , and a result B 2 of the calculation is notified to the user. The user inputs the calculation result B 2 . Individual code calculating means carries out the same calculation as the above-mentioned calculation and obtains the calculation result B 3 . When the calculation result B 2 coincides with the calculation result B 3 , the inoperable state can be canceled.
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