Given the box office figures, this shouldn't come as any surprise.
An inside source, who wishes to remain anonymous, tells ShockTillYouDrop.com author Richard Matheson has signed off on sequel rights for the smash hit I Am Legend. Matheson wrote the original 1954 novel upon which Francis Lawrence's film is based.
This does not necessarily mean a sequel is a "go." It simply gives Warner Bros. peace of mind should they find the right direction to take the story in and opt to move forward on a second chapter. If that does happen, it would be the first time the "Legend" material was sequelized.