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I like your comparison to Google. But, you've opened the door to Google Book Search (which, I'll expect you meant to do). Correct me if I'm wrong, but, didn't book publishers argue that GBS was impeding their ability to develop and profit off of the same technology on behalf of the works for which they hold copyright? Which is exactly what HPL's book would do, especially since the author knows quite well that JKR plans to write her own encyclopedia. I think that might have been behind the Seinfeld books' case, too. Of course it goes against all logic that someone who was fan enough to buy this book wouldn't buy the official version, but, you can't prove that wouldn't happen ever.