Lockable tape cassette control system

Details Lockable tape cassette control system Lockable tape cassette control system

1990-07-30

1991-08-13

Wallace, Linda J.

Cryptography

Cryptanalysis

380 5, 380 22, 380 23, 380 52, 360132, G11B 2328, H04K 100

Patent

active

050402102

ABSTRACT:
A tape cassette which locks up to prevent more than one play through of the information carrying portion of the cassette has a label with an encrypted unlocking combination for the cassette along with a memory address for a key code needed to decrypt the combination. A locked up cassette may be inserted in an unlock terminal which reads the information on the label and looks in memory at the address on the label for a key code. The returned key code is used to decrypt the unlocking combination read from the label and the unlocking combination is applied to unlock the cassette. A host may intermittently communicate with the unlock terminal in order to update the memory of the unlock terminal.

REFERENCES:
patent: 4528588 (1985-07-01), Lofberg
patent: 4632335 (1986-12-01), Dickson et al.
patent: 4802212 (1989-01-01), Freeman et al.
patent: 4874143 (1989-10-01), Armstrong et al.
patent: 4930158 (1990-05-01), Vogel
patent: 4947318 (1990-08-01), Mineo

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