Copyright Helps

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General Copyright Information
Copyright For The Rest Of Us: A Guide For People Who Aren’t Lawyers by Marsha Keyser. An open source guide to copyright designed with laypeople in mind.
Public Domain information
Copyright Term and Public Domain in the United States from Cornell's Copyright Information Center
Public Domain: Search for copyright information
From the U.S. Copyright Office (records after 1978)
From the Internet Archive: records of copyright ownership from the United States Copyright Office for the period from July 1891 through December 1977.
From Stanford's Copyright Renewal Database: "compiles all US Class A (book) renewal registrations for works published between 1923 and 1963. These renewals were received by the US Copyright Office between 1950 and 1993."
From University of Pennsylvania's Online Books Page "Information about The Catalog of Copyright Entries"
From Google's scans of The Catalog of Copyright Entries
Fair Use Helps
Fair Use Evaluator developed by ALA’s Office for Information Technology.
Fair Use of Copyrighted Materials from Copyright Crash Course, University of Texas Libraries
Fair Use Checklist from Columbia University Libraries
TEACH Act Helps
The TEACH Act from Copyright Crash Course, University of Texas Libraries
Instructor-Specific Help
Exceptions for Instructors in U.S. Copyright Law developed by the ALA Office of Information Technology