Computer system for protecting a file and a method for protecting a file
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 9, 2001
Grant Date -
N/A
app pub date -
Mar 23, 1998
filing date -
Jul 31, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A computer system is provided having a protection mechanism for protecting the contents of a file. The protection mechanism has at least one Viewer program, at least one challenge associated with the Viewer program and the file, and at least one response with private keying material that it can access. The challenge has no access to the private keying material. The response can prove that it has access to the private keying material by interacting with the challenge using an asymmetric cryptographic scheme. The challenge can instruct the Viewer program to avoid using some or all of the file's content unless the proof is successful.
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