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I don't understand this either.
What I can understand, is something such as the following. I've seen smaller bookstores however, that sell non-copyrighted books for $0, and they only have one copy in their store: their own version. Normally it's of good quality. They're probably trying to make a good impression on customers that end up in the store and "buy" a free eBook. They hope that customers will come back to purchase copyrighted/current/popular books.
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