PDA Defense offers Time-sensitive bit-wiping "bomb": PDA Defense prevents unauthorized access to data if the PDA is lost or stolen by allowing the user to bit-wipe the data automatically if a device is not HotSynced within a specified time frame. Esentially, it deletes the data at that point, so no one else can get access to it. Extreme perhaps, but ensures no one else will see it.
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Michael Steinberg
Editor
BizTrip
http://www.biztrip.com