Ann said “reasonable limit”. I would like to know what that reasonable limit is. I feel that colleges or K to 12 have assumed it is 10%, whereas we feel it's the nature of the copying.
If you copy one page of my story, that's fine. But if you copy a whole poem on one page, you're copying someone's work and distributing it and you are using it in place of a textbook. It's the nature of the copying; it's not the reasonable limit, or whatever they feel because of that educational exemption.