The phrase "unauthorized persons" refers to individuals who do not have permission or official authorization to be in a certain place or access certain information. They are people who are not allowed to be there or do something. Full definition
Coordinated with police or fire departments in cases of emergency, such as fire or presence of unauthorized persons. (resumemycareer.com)
If your corporation can not protect its data from access by unauthorized people, the result may be disastrous for the company itself together with all sellers and stakeholders associated with the firm. (emergingenterprisecenter.com)
Electronic key cards make it harder for unauthorized people to enter hotel rooms, but it's done little to protect travelers from inside jobs. (travelinsurancereview.net)