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I'm only concerned when the paper book is not published anymore and it's availability falls to nothing because the eBook isn't available either. There are many important books that fall into this category. I'm reading a couple next year for my reading challenge. They aren't old enough to fall into public domain, but weren't published in large quantities and aren't published anymore from what I can tell. That is the knowledge that will disappear because we don't protect our knowledge like we protect companies.
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