EFF Fights National Security Letter Demands on Behalf of Telecom, Internet CompanySan Francisco – The Electronic Frontier Foundation (EFF) filed two briefs on Friday challenging secret government demands for information known as National Security Letters (NSLs) with the Ninth Circuit Court of Appeals. The briefs-one filed on behalf of a telecom company and another for an Internet company-remain under seal because the government continues to insist that even identifying the companies involved might endanger national security.