Not really. They're claiming that it isn't the _user_ that's scribbling on the HTML page, which is why their HTML (their customers' HTML specifically) is differ

Not really. They're claiming that it isn't the _user_ that's scribbling on the HTML page, which is why their HTML (their customers' HTML specifically) is different from books. Perhaps it would have limited libraries from re-lending books that a patron scribbled on. But not automatically, it would require a second court case.