Owner

The only security principal who has an inherent right to allow or deny permission to access an object. An object's owner can give another security principal permission to take ownership. By default, the built-in Administrators group on a computer is assigned a user right that allows this group to take ownership of all objects on the computer.

The one user (apart from the superuser) who has absolute control over a "file". A file may also have a "group" of users who may exercise joint ownership if the real owner permits it. See "permission bits".