Quote:
Originally Posted by tompe
For example what is used now for many textbooks. You need a code to do mandatory exercises so you gave to buy the book to get the code.
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How is that in any way relevant to the vast majority of books publishing, which is fiction for recreational reading? Do you propose some system by which you can force someone to do "mandatory excercises" when they buy a trashy romance novel? If not, then maybe you could try to come up with something relevant to the real world.