- US Copyright Office The Library of Congress
- Canadian Copyrights Database(CIPO)December 28, 2007trong>
- Copyright Clearance Center
- Access Copyright (formerly Cancopy)
- International Intellectual Property Alliance (Copyright)
- Canadian Intellectual Property Office (Copyrights)
- U.S. Copyright Office Home Page
- The Copyright-Licensing Agency (The UK's reproduction rights organization)
- The Copyright Society of the USA

