The Librarian does not give a dragon skill book. Never has.
Very interesting. Has this been changed by the Patch 2? Because during my past playthroughs, I have always received 2 books from him: Orbis Arcesso and a Dragon Skill Book.
How do you explain the following conversation?
Dragon Knight: Might this be the book you were looking for?
The Librarian: Yes! There it is! How can I reward you my good friend?
Dragon Knight: I should like to have a look at the second part.
The Librarian: But of course! Here you go. And take this book as well. It will prove very useful should you one day become a Dragon Knight.