Fair use is a legal doctrine that promotes freedom of expression by permitting the unlicensed use of copyright-protected works in certain circumstances.
Section 107 of the Copyright Act provides the statutory framework for determining whether something is a fair use and identifies certain types of uses—such as criticism, comment, news reporting, teaching, scholarship, and research—as examples of activities that may qualify as fair use.
Source: U. S. Copyright Office.
Always use the principles of Fair Use and other exemptions first to determine if a use is within copyright law. You can always seek permission on your own.
The four factors to be considered in determining fair use are:
Source: U.S. Copyright Office
Single copies may be made by or for teachers for scholarly research and class preparation. These guidelines include:
Multiple copies may be made for classroom use, not to exceed one copy per pupil, and must: