Works not under copyright protection enters the Public Domain and can be used and adapted freely without permission, because no one can own materials in the public domain. Common reasons why works enter the public domain include:
Current law protects all original works under copyright, whether registered or not, for the life of the author plus 70 years. But, there are exceptions. The following is a general guide to determine if a work is in the public domain:
For a detailed resource on Public Domain, see Stanford University Library's page at https://fairuse.stanford.edu/overview/public-domain/welcome/.
Copyright Duration Chart for Term and Public Domain provides a schedule for when a work enters the Public Domain.
Use the Public Domain Slider below to determine if a work is in the Public Domain.