There is no relationship between the PCN Program and Copyright registration. The principal intention of copyright records is to document the intellectual or creative ownership of a work. The principal intention of the PCN Program is to assign Library of Congress Control Numbers (LCCNs) in advance of publication to those titles that the Library may add to its collections. When printed in the book, the LCCN facilitates access to the bibliographic record for that book and thereby expedites book processing by libraries and book dealers who obtain copies of the book.
Separate deposits are required to fulfill either mandatory deposit (Section 407) or copyright registration (Section 408) of US Copyright Law.
The mailing address of the Copyright Office is:
Library of Congress
101 Independence Avenue, S.E.
Washington, D.C. 20559
Phone: (202) 707-3000