Abstract: The specification describes a security system for protecting vending machines from vandalism and theft of the goods or money contained therein. The security system includes a cage and a door rotatably attached to one side of the cage. The cage is securely fixed to the floor on and/or wall against which the vending machine is placed. The door is lockable by a unique locking system and has a seam protection structure formed in the frame of the door for protecting vulnerable seams existent on the front of the vending machine. The security system is adjustable and formed from rugged steel bars.