A functionality of an accessible device such as a set-top box, computer, mobile device, media device, is unlocked or otherwise made available to a user by a security system dependent on an external paired device, such as a mobile device, a key fob or radio frequency identification (RFID) device paired to the accessible device being in a particular wireless communication range of the accessible device. When an authorized user carries the external paired device, this provides the authorized user of the accessible device the ability to conveniently restrict the use of the accessible device and access to various functionalities of the accessible device, such as access to particular television programming or streaming media at times when the authorized user is not in close proximity or in the same general area of the accessible device.