"Least restrictive means"? One way that SOPA could die in court

[Commentary] How might the Stop Online Piracy Act (SOPA) hold up to a court challenge?

That means reviewing earlier efforts to regulate content on the Internet, among them the thankfully extinct Child Online Protection Act (COPA). Like SOPA, with its vague prescriptions against sites "dedicated to theft of US property" or that confirm "a high probability" of copyright infringement, the courts took a look at COPA and saw an overbroad legal mess that needed to be stopped, and fast. Here's how that decade-long legal debacle went, and why it is relevant to this controversy.