Fair Use:A legal doctrine that allows limited use of copyrighted material without requiring permission from the copyright holder, such as for purposes of criticism, comment, news reporting, teaching, scholarship, or research.
Public Domain:Works that are not protected by copyright and can be used freely by the public, either because the copyright has expired or the work was not eligible for copyright protection.
Digital Millennium Copyright Act (DMCA): A law that criminalizes the circumvention of digital rights management (DRM) technologies and provides safe harbors for online service providers against copyright infringement liability.