Under the Associations Incorporation Act 1985 , an incorporated association must have a common seal (that is, a rubber stamp with the full name of the association on it) which can be ordered from a stamp maker or stationer. The common seal serves as the signature of the association. It is only needed for documents that must be under seal if executed by an individual, such as land transfers or lease. The rules of associations generally provide that the common seal is to be used only by resolution of the committee and in the presence of at least two officers as witnesses.