How do I remove this lock?

[Carl Duke]

Has anyone on this forum seen a lock system like this one?  I am closing on this home in two weeks and this deadbolt is broken (it is locked now and the interior knob does not turn the deadbolt.)  I am trying to determine if anyone knows how to remove this lock.  My fear is that it is a proprietary lock to this door and I would be required to replace the entire door as opposed to simply switching out the lock.  

Any help anyone could provide on how to remove this type of lock would be EXTREMELY appreciated!  

Thanks, 

Carl