A trade mark is a graphically represented sign by which goods or services from one enterprise may be distinguished from those of others. Once registered, a trade mark confers on the owner a right to protect the mark and prevent its use without permission.

Trade mark infringement is the unauthorised use of a mark registered to another person. It should be distinguished from passing off, which involves the marketing of goods or services in such a way as to suggest that they come from, and enjoy the reputation of, another enterprise.