CD vs paper book analogy is deeply flawed, because one is digital and the other is analog. It's not just the amount of effort, but in fact impossibility to scan the content into an equivalent digital form, which distinguishes A/D conversion from D/D. You can't really scan a book with all the figures, sidelines, etc.
Furthermore, the original printed book nowadays is produced from digital masters. It's much more natural for the publisher to produce an ebook from the same masters as the paper book he prints.
I posit that if the notion of the right to contents comes to pass, the right to have a digital original of any analog or digital instance will naturally follow, with the necessary fees and even profits. Perhaps, you can buy one instance at market price, and be eligible for digital upgrade at a discount.
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