Non-removable closure/finish system

A container and closure package to provide secure threaded attachment of the closure to the container in a predetermined orientation and inhibits removal of the closure. A container neck finish has an external thread and an external annular ledge or flange therebelow having external locking recesses or notches. A closure includes an inner annular wall adapted for threaded engagement on the neck finish. A closure outer annular skirt wall inhibits tampering access to an intermediate annular locking lug wall disposed concentrically between the inner and outer skirt walls. Locking lugs protrude radially inwardly from the inner periphery of the intermediate annular wall and are disposed for snap receipt into the ledge locking notches as the closure is fully threaded onto the container neck finish.