发明名称 |
Controlling access to stored information |
摘要 |
<p>Access to stored information by a user is controlled by comparing an actual geographic position and/or an actual date/time with a geographic region and/or a date/time interval within which access to the stored information is authorized. The actual geographic position where the stored information is located, and the actual date/time can be determined, for example, based on signals received at a receiver supplying reliable position and time information, such as a GPS receiver. Access to the stored information is authorized if the actual geographic position and/or date/time falls within the authorized geographic region and/or date/time interval. The position and date/time information supplied by the receiver may be cryptographically signed and encrypted. <IMAGE></p> |
申请公布号 |
EP0997808(A2) |
申请公布日期 |
2000.05.03 |
申请号 |
EP19990308483 |
申请日期 |
1999.10.27 |
申请人 |
DATUM, INC. |
发明人 |
HASTINGS, THOMAS MARK;MCNEIL, MICHAEL E.;GLASSEY, TODD S.;WILLETT, GERALD L. |
分类号 |
G09C1/00;G01S19/14;G06F1/00;G06F12/00;G06F12/14;G06F21/00;G06F21/20;G06F21/24;H04L9/00;H04L9/14;(IPC1-7):G06F1/00 |
主分类号 |
G09C1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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