Clubs don't need regular liquor licences as they are "redistributing the members' assets". i.e. the drink was bought with membership money so it belongs to the members. And for that reason they can't serve a non-member. BUT, they can serve a member who in turn can give his personal beer to someone who is a non-member. Hence as a non-member you're supposed to sign the register on entry, giving the member's name you are with.
For this to be legal it has to be a registered club.