Public domain
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A work is in the public domain if nobody holds a copyright on it. Works that are in the public domain can be freely copied.
Two examples of material in the public domain are United States government works and writings for which their copyright has expired. Generally anything published before 1923 cannot have copyright protection and is in the public domain.[1]
References
External links
- How Can I Tell Whether a Book Can Go Online? Guidance from the University of Pennsylvania Online Books project.