The title of the book is not explained anywhere (outside the game itself), in the game it is translated as the Book of Lore". Throughout the game Merlin mentions additional material and facts said to originate out of the book (some of which that does not appear in the actual manual). Liber ex Doctrina it is Latin and has a double meaning, depending on whether one interprets the word liber as "book" or as "free". In the first case, the title means "Book from knowledge", but in the second case, the title means "Free from doctrine". It is not clear whether the authors did this on purpose.