According to Reuters, Gary Friedrich has filed a lawsuit claiming he owns the copyright to Ghost Rider:

Gary Friedrich and his company filed the 61-page complaint April 4 in federal court in Illinois claiming 21 violations based on the production and marketing of Sony's recent "Ghost Rider," starring Nicolas Cage and Eva Mendes. Friedrich claims the copyrights used in the film and in related products reverted from Marvel to him in 2001.

The defendants include Sony's Columbia TriStar Motion Picture Group, producers Relativity Media, Crystal Sky Pictures and Michael De Luca Prods. as well as Hasbro Inc. and Take-Two Interactive.

Friedrich alleges copyright infringement, and accuses Marvel of waste for failing "to properly utilize and capitalize" on the Ghost Rider character. Marvel's attempts to do so, Friedrich claims, have only damaged the value of his work by failing to properly promote and protect the characters and by accepting inadequate royalties from co-defendants. Friedrich also claims that toymaker Hasbro and videogame firm Take-Two have improperly created merchandise based on the characters.