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Now Playing: 3-25-13 Marketplace Tech: Illegal Internet Research and 3D Gun Licenses

Now that he has a federal license, the law school student who wants to use 3D printing to manufacture firearms remains wary the government could still shut him down. Cody Wilson goes to the University of Texas and is head of an enterprise called Defense Distributed. Even with the license, he's working on more permits and issues such as protection from liability. And, how a hacker 'researched' the stability of the whole Internet by creating a giant network of insecure online devices.