***What is a Restricted Key System?**** A-Access Lock & Key company is a professional Charlotte locksmith agency serving the Charlotte, NC area. A restricted key system is a locking system whose keys are all linked to the master key. No one can duplicate the master key without the owner’s consent. It means there are no extra keys anywhere in the world for this restricted key system. Offices, apartment complexes, hospitals, and commercial premises can use restricted key systems for maximum security. ~ Teddy Poulos, Chief Locksmith, A-Access Lock & Key. Choose A-Access Lock & Key. We are the key to your security. #Charlotte #Locksmith #AAccessLock&Key