Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Packet header designating cryptographically protected data
Reexamination Certificate
2002-05-14
2009-12-08
Revak, Christopher A (Department: 2431)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Packet header designating cryptographically protected data
C726S032000, C713S176000
Reexamination Certificate
active
07631184
ABSTRACT:
Improved approaches for securing files that are derived from secured files are disclosed. In general, a secured file can only be accessed by authenticated users with appropriate access rights or privileges. Each secured file is provided with a header portion and a data portion, where the header portion contains, or points to, security information. The security information is used to determine whether access to associated data portions of secured files is permitted. These improved approaches can thus impose security on files that are derived from secured files. In one embodiment, files that are deemed derived from a secured file include files that are copies of the secured file. In another embodiment, files that are deemed derived from a secured file include files having content substantially similar to the content of the secured file.
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Revak Christopher A
Sterne Kessler Goldstein & Fox PLLC
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