Fair Use allows copying without getting permission from the copyright holder under certain limited circumstances. However “fair use” is open to interpretation. Below are four factors in determining “fair use” as outlined in the United States Code (USC). The closer you come to meeting these criteria, the more likely it is that you are within the “fair use” limits.
“Notwithstanding the provisions of sections 106 and 106A, the fair use of a copyrighted work, including such use by reproduction in copies or phonorecords or by any other means specified by that section, for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright. In determining whether the use made of a work in any particular case is a fair use the factors to be considered shall include: