PUBLIC DOMAIN
DEFINITION
Public domain refers to works no longer protected by copyright, either because their term of protection has expired, they were never eligible for protection, or the creator dedicated them to public use. Anyone can copy, adapt, or distribute a public domain work without permission or payment.
WHAT IT MEANS IN PRACTICE
Copyright term, and therefore when a work enters the public domain, is not identical across borders. The US and most EU countries protect works for the life of the author plus 70 years, but the starting calculation, renewal quirks, and treatment of older works differ enough that a work can be public domain in one country and still protected in another.
US copyright has an added complication: works published before 1978 were subject to renewal requirements and fixed terms under older law, so determining public domain status for a mid-century American work sometimes requires checking historical renewal records rather than just doing a life-plus-70 calculation.
Public domain status applies to the specific work, not automatically to derivative versions of it. A modern translation, restoration, or edited edition of a public domain novel can itself carry a fresh copyright in the new creative contributions, even though the underlying original text is free to use.
Government works are handled inconsistently too: most US federal government works enter the public domain immediately upon creation, while EU member states generally do not extend the same blanket treatment to their own government output.
AN EXAMPLE
A publisher wants to release a new print edition of a novel first published in 1925. In the US that novel entered the public domain, but the publisher discovers that a well-known English translation of it was made in 1990 and is still under copyright, so using that specific translation still requires a license even though the original text does not.
WATCH OUT
People assume 'old' automatically means public domain, but exact expiry dates vary by country and by the specific edition or translation in question.
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