The professor may have an infringement problem unless he got the author's permission. Handling problems at the intersection of copyright law and the Internet probably requires a few precautions. One, of course, is to stick to rules of use. Another is caution and care in using other peoples' materials. If a use isn't fair, then it probably pays to contact the author for permission to copy and distribute the work.
Many Web sites allow visitors to contact owners via e-mail.
When permission isn't available, that's a good sign that the author does not want material copied and distributed. Copyright confusion continues on the Web. Very gradually, however, it's clearing up. Martin Paskind is an Albuquerque lawyer. His practice emphasizes legal services to small businesses.