A row has blown up over millions of pounds made by The Lord of the Rings films.
The three movies were based on books by JRR Tolkien and they made the studio who filmed them £3 billion ($6billion).
The money was made from cinema tickets and DVD sales and the people who manage JRR Tolkien's estate say a percentage of the profits was promised to them.
The film company, New Line Cinema, said it didn't want to comment on the matter.
An estate is everything you own, including money and houses, and it is left to others when you die.
Tolkien died in 1973 and in this case the estate is a charity called The Tolkien Trust, which was set up by his sons.
The company that published The Lord of the Rings books is called HarperCollins and bosses there say they were also told they would also receive some of the films' profits.
The Trust and HarperCollins say they have not received any money and now they are taking Time Warner Inc's New Line Cinema to court to try and get them to pay up.
The row could stop Tolkien's novel The Hobbit being made into a film. The first part is due to be released in 2010.