Copyright Dangers

Today's presentation on copyright protections was interesting, and something that every teacher should probably see at some point.  I know that I, at times, am teaching in "emergency mode", where I'm scrambling to have something prepared for the next day, even the next period.  It seems that these would be the times where I would be most in danger of mistakenly violating a copyright; knowing more about what is and isn't fair use will help to avoid this danger.  I was happy to hear that copyright suits against schools and teachers are rare, but finding ways to avoid trouble is better still.