Section 21 makes provision for two types of regulation. The first will prohibit or restrict licensees from engaging in promotional activities that are likely or intended to encourage people to consume alcohol to an excessive extent, such as promotions inviting customers to drink all they can for a flat amount of money. The second will specify particulars to be affixed to any container in which intoxicating liquor is sold for the purpose of establishing a link to assist the Garda in investigations, but not necessarily an evidential link for criminal purposes where off-licences are concerned.