He has been credited for the authorship for some time now by the people that he wants to know, his circle of marxists etc. He doesn't need the money and he doesn't care what the masses think. He wants to be credited for "generosity" to Obama by those he admires like Obama's czars, Castro, Chavez, etc.
His saying, "Prove it and we can split the royalties" is his way of saying to Ann Leary that she is powerless and he is on top. "Guilty as hell, free as a bird."
Exactly right, IMO.
"Simply, because, you see the useful idiots; the leftists who are idealistically believing in the beauty of Soviet or Communist or Socialist or whatever system; when they get disillusioned, they become the worst enemies. That's why my KGB instructors specifically made the point, "never bother with leftists, forget about these political prostitutes - aim higher" this was my instruction."--Yuri Bezmenov, KGB Defector