Copyright is a form of protection provided by the Congress of the United States to the authors of "original works of authorship," including literary, dramatic, musical, artistic, and certain other intellectual works. This protection is available to both published and unpublished works.
What Is Fair Use?
Fair Use for Educational Purposes
What Can You Do?
A public domain work is a creative work that is not protected by copyright and which may be freely used by everyone. The reasons that the work is not protected include:
(1) the term of copyright for the work has expired
(2) the author failed to satisfy statutory formalities to perfect the copyright, or
(3) the work is a work of the U.S. Government.