U.S. Copyright Office - Welcome to the U.S. Copyright Office. We in the Copyright Office are proud to be part of a long tradition of promoting progress of the arts and protection for the works of authors.

Library of Congress - A Library of Congress catalog card number is a unique identification number that the Library of Congress assigns to the catalog record created for each book in its cataloged collections. Librarians use it to locate a specific Library of Congress catalog record in the national databases and to order catalog cards from the Library of Congress or from commercial suppliers. The Library of Congress assigns this number while the book is being cataloged. Under certain circumstances, however, a card number can be assigned before the book is published through the Preassigned Card Number Program.

Click & Copyright - We've worked hard to create the most comprehensive, yet easy-to-use U.S. Copyright registration system that you'll find anywhere. Protecting your intellectual property has never been easier, faster, or more affordable. The difference is in our unique personal touch approach - people serving people. At Click&Copyright we fully manage your registration application from start to finish. There's no guessing with Click&Copyright. We start with guiding you through to the appropriate form selection (and completion) and don't stop until we've delivered your application and work to the U.S. Copyright Office via Federal Express. If you want, we'll even send you a copy of the mail receipt!