The FBI document, called a national security letter, told Kahle he could be prosecuted if he discussed the subject with anyone but his lawyers, and allowed him to speak with his attorneys only in person. Kahle said his Internet Archive, which has 500,000 card-holders, doesn't even keep the records the FBI was seeking.

He was allowed to speak publicly Wednesday under a rare settlement in which the FBI agreed to withdraw its letter and lift the gag order. That should show other librarians, and members of the public who receive any of the nearly 50,000 national security letters the government issues each year, that "you can push back on these," Kahle said.

National security letters are subpoenas issued by federal agencies to require businesses and other institutions to produce records of their customers. The agencies do not need court approval for the letters.

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