I really don’t understand how Amazon could plan a TV series set in the 2nd Age without buying more book rights aside from the Hobbit and LotR. The show is only

I really don’t understand how Amazon could plan a TV series set in the 2nd Age without buying more book rights aside from the Hobbit and LotR. The show is only based on LotR’s appendix. Now we know why their LotR consultant left early