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Students have always shared book if they were to expensive (that is a copy of the book done in a copying machine is much less expensive).
We used a book in a logic course that had a key that was used to correct exercises via the net. The book was freely available as pdf but to pass the course you had to have a unique key and two persons could not use the key at the same time. That is one way to get people to buy a new book.
Maybe you could sell sets of books for one class to the teacher and then they could collect the money for using the book?
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