From The New York Times:

Now, with a high-powered legal team behind it, Mr. Wilson’s company,Defense Distributed, a self-described “anti-monopolist digital publisher,” has filed suit against the State Department claiming that its efforts to stop him from publishing his instructions, which are no more than computer code, amount to a prior restraint on free speech. The 25-page suit, filed on Wednesday in Federal District Court in Austin, Tex., is an innovative and apparently unprecedented effort to use the First Amendment in support of the Second.

From Wired:

Wilson’s gun manufacturing advocacy group Defense Distributed, along with the gun rights group the Second Amendment Foundation, on Wednesday filed a lawsuit against the State Department and several of its officials, including Secretary of State John Kerry. In their complaint, they claim that a State Department agency called the Directorate of Defense Trade Controls (DDTC) violated their first amendment right to free speech by telling Defense Distributed that it couldn’t publish a 3-D printable file for its one-shot plastic pistol known as the Liberator, along with a collection of other printable gun parts, on its website.