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I would think that the first limitation has to do with the fact that it would only work for digital-only books. You are not going to have variations in the physical version, which means that the physical version is a DRM-free version.
The second problem would be that stores like Amazon, where you can download your purchased books again would have to keep all versions of the books. If you have 10k variations the store has to keep 10k versions of the book specifically linked to each customer.
The third problem is that if this is an automatic algorithm it will have some problems when are quotes in the book (not to be or to be, that is the question).
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