United States Copyright Office
Definition - What does United States Copyright Office mean?
The United States Copyright Office holds all of the copyrights issued within the US. It is an official government body and is a wing of the Library of Congress. Copyright title searchers use this office and their database to review copyrighted services when they want to register a chain of title.
Justipedia explains United States Copyright Office
The copyright act is at the core of the copyright office. It has been a part of US government since 1790. The function of the office has not changed in this time except that registering a copyright is now down via computer. In order to get a copyright one must pay required fees. These fees need to be paid annually in order to keep the copyright.