KRS 237.110 (17)The owner, business or commercial lessee, or manager of a private business enterprise, day-care center as defined in KRS 199.894 or certified or licensed family child-care home as defined in KRS 199.8982, or a health-care facility licensed under KRS Chapter 216B, except facilities renting or leasing housing, may prohibit persons holding concealed deadly weapon licenses from carrying concealed deadly weapons on the premises and may prohibit employees, not authorized by the employer, holding concealed deadly weapons licenses from carrying concealed deadly weapons on the property of the employer. If the building or the premises are open to the public, the employer or business enterprise shall post signs on or about the premises if carrying concealed weapons is prohibited.
Possession of weapons, or ammunition, or both in a vehicle on the premises shall not be a criminal offense so long as the weapons, or ammunition, or both are not removed from the vehicle or brandished while the vehicle is on the premises. A private but not a public employer may prohibit employees or other persons holding a concealed deadly weapons license from carrying concealed deadly weapons, or ammunition, or both in vehicles owned by the employer, but may not prohibit employees or other persons holding a concealed deadly weapons license from carrying concealed deadly weapons, or ammunition, or both in vehicles owned by the employee, except that the Justice and Public Safety Cabinet may prohibit an employee from carrying any weapons, or ammunition, or both other than the weapons, or ammunition, or both issued or authorized to be used by the employee of the cabinet, in a vehicle while transporting persons under the employee's supervision or jurisdiction. Carrying of a concealed weapon, or ammunition, or both in a location specified in this subsection by a license holder shall not be a criminal act but may subject the person to denial from the premises or removal from the premises, and, if an employee of an employer, disciplinary measures by the employer.
This was written into the concealed carry law when it was passed just to clarify that private businesses didn't have to allow licensees to CC on their property. At that time there were some legislators that thought that the intent of the supporters of the CC bill was to force private property owners to accept CC on their private property and they insisted on this being in the bill in exchange for their votes to pass it. Notice that this statute does not specify what the sign must say. Almost any wording is OK.