10/03/2013 07:29 am ET Updated Dec 03, 2013

Lavabit Founder Attempted To Thwart FBI, New Documents Show


DALLAS — One day last May, Ladar Levison returned home to find an F.B.I. agent’s business card on his Dallas doorstep. So began a four-month tangle with law enforcement officials that would end with Mr. Levison’s shutting the business he had spent a decade building and becoming an unlikely hero of privacy advocates in their escalating battle with the government over Internet security.

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