Information security – Prevention of unauthorized use of data including prevention... – Copy inactivation
Reexamination Certificate
2002-02-06
2009-02-17
Revak, Christopher A (Department: 2431)
Information security
Prevention of unauthorized use of data including prevention...
Copy inactivation
C713S193000, C386S349000
Reexamination Certificate
active
07493662
ABSTRACT:
In a data nullification device for nullifying target data recorded on a recording medium, target data is made up of a plurality of data blocks. A judging unit judges, in units of data blocks, whether the target data needs to be nullified. A nullifying unit nullifies, when a predetermined number of data blocks are judged as needing to be nullified or when one or more data blocks whose total amount of data reaches a predetermined amount are judged as needing to be nullified, the judged data blocks.
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Ito Yoshikatsu
Miyazaki Masaya
Motohashi Yoshihiko
Murase Kaoru
Henning Matthew T
Panasonic Corporation
Revak Christopher A
Wenderoth , Lind & Ponack, L.L.P.
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