The copyright statute codifies the following four factors in weighing whether or not the use of a copyrighted work is a fair use:
There are four common ways that works arrive in the public domain:
Copyright has expired for all works published in the United States before 1923. In other words, if the work was published in the U.S. before January 1, 1923, you are free to use it in the U.S. without permission.
Creative Commons helps creators legally share their knowledge and creativity to build a more equitable, accessible, and innovative world. See infographic below.