4 Factors of Fair Use
1. Purpose & Character of Use
2. Nature of Copyrighted Work
3. Amount Used
4. Effect of Potential Market or Value
Fair Use Index (U.S. Copyright Office)
Code of Best Practices in Fair Use for Online Video
Code of Best Practices of Fair Use for the Visual Arts
Documentary Filmmakers' Statement of Best Practices in Fair Use
The Public Domain in Graphic Novels
Both graphic novels are available as free downloads from the Center for the Study of the Public Domain at Duke University.