Temporal proximity to verify physical proximity
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United States of America Patent
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Mar 31, 2015
Grant Date -
Apr 25, 2013
app pub date -
Dec 5, 2012
filing date -
Jun 28, 2001
priority date (Note) -
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Abstract
A security system assesses the response time to requests for information to determine whether the responding system is in physical proximity to the requesting system. Generally, physical proximity corresponds to temporal proximity. If the response time indicates a substantial or abnormal lag between request and response, the system assumes that the lag is caused by the request and response having to travel a substantial or abnormal physical distance, or caused by the request being processed to generate a response, rather than being answered by an existing response in the physical possession of a user. If a substantial or abnormal lag is detected, for example due to the fact that the information was downloaded from the Internet, the system is configured to limit subsequent access to protected material by the current user, and/or to notify security personnel of the abnormal response lag.
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