| 摘要 |
A record carrier (1) has a secure first data storage means (2) storing a plurality of different identification numbers (12, 13, 14) in a sequence and a further data storage means (3) storing a further number. The identification numbers comprise successive integers, and the further number comprises the least significant digit of one of the said integers. The secure data storage means preferably comprises permanently structured magnetic tape. The further number is derivable in a predetermined way from only one of the identification numbers, thus identifying uniquely which one of the identification numbers is characteristic of the record carrier.
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