No person shall throw, cast, distribute or deposit any handbill upon any private premises, if there is placed on said premises in a conspicuous position near the entrance thereof, a sign bearing the words “No Trespassing,” “No Peddlers or Agents,” “No Advertisement” or any similar notice, indicating in any manner that the occupants of the premises do not desire to have any such handbills left upon the premises. The provisions of this Section shall not apply to the distribution of mail by the Unites States, or to newspapers, as defined herein in Section 9.55.010.C.