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Primarily for librarians but of interest to educators. While the forum is no longer active, the site includes useful tools like the Public Domain Slider, Section 108 Spinner, and Exceptions for Educators eTool.
Indiana University/Purdue University at Indianapolis; Kenneth Crews’ guide to copyright for educators. Especially useful are the Copyright Quickguide and the Fair-Use Checklist.
An excellent source of authoritative information all in one place. Includes text of all relevant laws, information about pending legislation, how to register items for copyright, and much more.