A trade mark is a sign used in business to distinguish the goods or services of a particular trader or service provider from those of another. A trade mark can be a word, phrase, letter, number, sound, smell, shape, logo, picture, aspect of packaging or a combination of these.
A registered trade mark gives you the legal right to use, license or sell it within Australia for the goods and services for which it is registered. Any assignment must be formally recorded on the Trade Mark Register.
There should always be a written licence if you allow any other person to use your registered mark. A failure to have a formal licence agreement with appropriate quality and financial control over the activities of the licensee could lead to the loss of registration.