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Public Domain Basics
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Quick Reference: Guide to Copyright Term & Public Domain in the USFrom Cornell University Libraries, a cheat sheet to consult when you need to know if a work is in the public domain.
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Welcome to the Public DomainEasy-to-follow overview of how works become Public Domain (includes discussion of government works, clipart, and expired copyright).
Some Collections of Public Domain Works
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Project GutenbergMost eBooks in this collection are in the public domain in the US.
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LibriVoxFree public domain audiobooks recorded and made public by volunteers.
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Free to Use & Reuse (Library of Congress)Images in the public domain, provided by The Library of Congress.
Public Domain Mark
This is the Creative Commons Public Domain Mark.
If you see this on a work, it means someone has identified that work as Public Domain (e.g. because copyright has expired, it is a government work, etc.)
To Dedicate Your Own Work to the Public Domain
If you wish to share your work for use without restrictions, the appropriate CC license is CC0 Zero "no rights reserved".