Fair use is a tricky issue. Remember, when claiming fair use exemption for copyrighted materials:

      Only use a small piece of the item and only what is absolutely necessary.

      Only use it for personal and class-related purposes.

      don't make a copy for someone else or make your copy of the material available in any openly accessible fashion.

      Don't use it if you are in any way adversely affecting the commercial potential of the work.

      Make sure that you take your excerpt of the work from a legally-obtained version of the work.

      If you're not sure if the use is legal, get permission or don't use it!