United States Copyright Office
Definition - What does United States Copyright Office mean?
The United States Copyright Office is an official government entity and is a wing of the Library of Congress. It holds all of the copyrights issued within the U.S., and is responsible for registering, keeping track of and generally managing these copyrights.
Justipedia explains United States Copyright Office
The function of the U.S. Copyright Office has not changed since its inception, except that registering a copyright is now done via a computer. In order to get a copyright, one must pay the required fees; these need to be paid annually to keep the copyright.
The U.S. Copyright Office has an online records catalog, which includes all copyright registrations from January 21, 1978, to the present day. Copyright title searchers use this database to look up copyright information and review copyrighted services when they want to register a chain of title.