op12 writes "CNET has an article describing how AT&T accidentally leaked sensitive information involving the NSA lawsuit. From the article: 'AT&T's attorneys this week filed a 25-page legal brief striped with thick black lines that were intended to obscure portions of three pages and render them unreadable. But the obscured text nevertheless can be copied and pasted inside some PDF readers, including Preview under Apple's OS X and the xpdf utility used with X11. The deleted portions of the legal brief seek to offer benign reasons why AT&T would allegedly have a secret room at its downtown San Francisco switching center that would be designed to monitor Internet and telephone traffic. The Electronic Frontier Foundation, which filed the class action lawsuit in January, alleges that room is used by an unlawful National Security Agency surveillance program.""