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Now Playing: 5-17-13 Marketplace Tech: Searching for Source Anonymity Online

Aaron Swartz left behind a considerable online legacy before his suicide earlier this year at age 26. But a posthumously-released collaboration with the New Yorker might be among his most profound innovations and it might just be the first step towards guaranteeing true online anonymity. Plus, why U.S. officials froze an exchange for the online Bitcoin currency, and what happens next.