Why is copyright such a tricky topic? Fair use for for educational purposes should be a save ground with clearly stated limits but it is not. The law is very imprecise on this and educational institutions have to be very careful because prestigious university and college libraries have had copyright infringement issues. For example, the amount of material that the students are allowed to copy is not specifically limited and there are many possibilities in between the extremes of copying an entire textbook from their school library (not fair use) and photocopying only a chapter (fair use).