The classroom exemption is intended to encourage the sharing, creation, and dissemination of information in an educational setting.
You may display a work or perform a work in class without obtaining permission so long as the use is for instructional purposes in a face to face environment. A fair use analysis should be conducted when using materials for an online environment. This applies to the showing of a film, movie, or television show, display of images, charts, and graphs in a presentation, and the playing or performing of music.
Following a positive fair use analysis, photocopies for classroom use and distribution to students should be limited to a single course for a single semester. Only one copy should be distributed to each student, which then becomes their property. Copies should always include a copyright notice on the first page.