He sold film rights to the Lord of the Rings and the Hobbit books and the appendices are included in the LOTR books. He never sold any rights to any appendices as justification for a television series covering the second age. These were sold by the Tolkien estate 5 years ago. So his intent was not to give the rights for an adaptation of the 2nd age based on the appendices because at that time, the Silmarillion, Unfinished Tales and his notes had not been published. Those are the main books covering the 2nd and prior ages, so if he didn't publish them, then obviously he didn't intend for people to read them let alone have movies or TV shows made about them. So the only thing he sold the rights for were the books as a whole to be made into films and it is those books that were his primary published work on Middle Earth before he died.