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The "Copyright Genie", the Fair Use Evaluator, the Public Domain slider, the Section 108 spinner, and the Exceptions for Instructors eTool are all nifty tools provided by this project of the American Library Association.
Helps you find out if a work is covered by U.S. copyright, calculate its terms of protection, and collects and publishes the results (as a PDF) to save for your records or further vet with a copyright specialist.
The U.S. Copyright Code provides for the educational use of copyrighted material without the permission of the copyright holder under certain conditions. This tool helps you determine if your intended use meets the requirements.