CNET News Video: Sizing your digital footprint
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CNET News Video: Sizing your digital footprint1:37 /
In September 2011, a new CBS drama called "Person of Interest" debuts. It explores the idea of using high-tech data to solve crimes. In reality, we all leave digital evidence, or clues, whether we know it or not. CNET's Kara Tsuboi reports.
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