I read a couple of articles covering the licencing of Tolkien's material.
You have to remember that only LOTR and the Hobbit were published during JRR's lifetime. All the other books were edited by his son Christopher and published after his death.
As I understand it, JRR licensed LOTR and the Hobbit before his death and the licenses have bounced around the movie industry resulting in the animated version in the 1970s and ultimately the upcoming trilogy.
Since JRR's death control of all Middle Earth material other than LOTR and the Hobbit reverted to his estate and JRR's kids. JRR's kids have to-date refused to have anything to do with the LOTR movies, they refused to assist Peter Jackson in reviewing his script and have all refused to attend any premieres. As I understand it, Christopher Tolkien who is the current "keeper" of the Tolkien legacy refuses to consider any further licensing agreements over Middle Earth material so we're stuck with whatever JRR licensed as his kids are obviously not going to agree to any more.
Arise, arise, Riders of Theoden!
Fell deed awake: fire and slaughter!
Spear shall be shaken, shields be splintered,
a sword-day, a red-day, ere the sun rises!
Ride now, ride now! Ride to Gondor!
Theoden King: The Return of the King