The 70-plus-page manual ended up in the Library of Congress, thanks to its author, an FBI official who made an unexplainable mistake. This FBI supervisory special agent, who once worked as a unit chief in the FBI‘s counterterrorism division, registered a copyright for the manual in 2010 and deposited a copy with the US Copyright Office, where members of the public can inspect it upon request. What‘s particularly strange about this episode is that government documents cannot be copyrighted.