This may sound like heresy here, but can you buy the paper version? The thought of a textbook that expires has me lost for words. I have kept *all* my uni textbooks - and I even look at them once in a while! I'll even admit that one of them I have read more of since finishing uni than while I was doing the class...
IIRC, only one class I took had a textbook written by the professor giving the class. He was so horrified at the price that the publisher wanted to charge that he arranged for all of us to get cheap photocopied versions of the entire book, for free. His view was that he wrote the book because there wasn't anything suitable for his course, not to make money.
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