What is Nondiscretionary access control?

A means of limiting admittance to objects created mainly on organizational or governmental actions.

Also known as "mandatory access control", a computer security system for access control.

the use machine in place of human being.
like various type of electronic access cards.

This is often called "Mandatory Access Control".
In computer security it is seen as the access control by which the operating system defines access to an operation on an object or target.
Most modern operating systems are MAC enabled.
Next to that this term (method) is used in MLS (Multi Level Secure) systems as a means of restricting access to objects based on the sensitivity (as represented by a label) of the information contained in the objects and the formal authorization (i.e., clearance) of subjects to access information of such sensitivity.
Currently the US Pentagon in planning to implement their data security in this way.

Administrator tightly controls access to all resources for everybody on a network