User blog comment:Darkcloud1111/Official "The Sea of Monsters (movie)" Discussion/@comment-4518608-20130811170951/@comment-180964-20130814004247

I think you summoned up the whole issue of adapting book to film perfectly in the end it simply comes down to the books rights. Most writers it seems sell all of their book rights away allowing them to made into a film. Or it Percy Jackson's case films but for some other writers they don't sell all their book writes away and still have some control over what gets done with the process of making their book into film.