Can you get the exact text back out with a prompt or not? Having or not having a book isn't fuzzy.
Having or not having a book is absolutely fuzzy. If you have a translation, do you have the book? Even if, like the Odyssey, there are hundreds of wildly varying translations? What about an abridged copy? What about the Sparknotes version? If you have a copy of Pride And Prejudice And Zombies, do you have a copy of Pride And Prejudice? Certainly more so than if you have neither.
Funnily the argument made just a few months ago by many rights holders who wanted their pound of flesh was that, if prompted a certain way, exact text could be retrieved.