The definition of Lore-4, "memorized by heart", is something that no one could achieve for works of such scale, and in any event, useful knowledge is something much more than simply storing the story in one's mind through memorization. It seems to me that this should involve such things as in-depth studies and comprehensive knowledge that goes beyond what might be obtained even from many readings. Even if someone had memorized the stories by heart, it does not mean that he knows anything about it. I know a man who has memorized large sections of the Bible but could tell you nothing whatsoever about the meaning of them in any sense whatsoever. In my case, I have not memorized anything as my mind is not really geared for that, but I have studied both the books and the movies in great detail.