No licensee, his agent or employee, shall allow in or upon his licensed premises, any improper conduct, disorder, illegality, disturbances, lewdness, immoral activities, or language, songs, entertainment, literature, pictures, raffle tickets or advertising material of indecent, profane or obscene nature, or cause to have printed or distributed any lewd, immoral, indecent, or obscene literature, pictures or advertising material of indecent, profane or obscene nature, except that premises properly licensed may permit raffle tickets.
18- 553 C.M.R. ch. 101, § 13