Yes – waht @SuperMouse and @BarnacleBill have said is true. Librarian are bound by a professional code not to reveal what patrons have been searching for on computers or what books they have checked out. There were protests about the provisions in the Patriot Act that allowed FBI agents to search library records. Often circulation records are destroyed once the book has been brought back for this very reason.
@wundayatta It does not mean that you cannot discuss research topics with others; of course not. It just means that you are not supposed to reveal individual’s private records to authorities. However, there was a time when a student was making bomb threats and had left a dubious site open on a computer. A student reported it to me, I told the director and the police removed the computer to try to identify that student.