Board Thread:General Discussion/@comment-24743080-20140731221823/@comment-4839682-20140802193053

I believe C.S. Lewis' estate owns the rights. I'm mot well versed in modern copyright laws, but the rights expire a certain number of years after the last time they were renewed (or the creator dies). I don't know if there's a limit on renewing rights.

The books were written when Walt Disney was still alive, and he focused on mostly fairy tales and folk tales. Disney doesn't make a movie out of everything, and they're not even able to do everything even if they wanted to, there's copyrights and what not sometimes. (Part of why Walt started with public domain stories, excepting Peter Pan - you don't have to pay to use those!)