Public libraries have been asked to turn over their records for specific terminals. A few have filed suit, because the National Security Letters that they were presented with were very sweeping, demanding information not just on the individual under investigation, but on everyone who had used specific terminals at the libraries during given time windows. Since many of the users in one case were minor children, one library felt that it had an obligation to notify the parents. The FBI has disagreed and the case is now working its way through the court system.