Prohibiting the use of audiovisual recording devices in motion +picture theaters without the consent of the owner or lessee of the facility and of the+ licensor of the motion picture exhibited, penalties; exempting owners, lessees+ or licensors alerting law enforcement authorities of alleged violations +from liability in civil actions for subsequently detaining the alleged +violator, excepting the use of unreasonable detention methods; exempting +certain sales demonstrations from the prohibition; authorizing prosecution of +alleged violations under laws providing greater penalties (ra)