Lockable tape cassette control system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 13, 1991
Grant Date -
N/A
app pub date -
Jul 30, 1990
filing date -
Jul 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully