Any transfer or modification of the rights attached to a trade mark must, in order to be enforceable against third parties, be entered in the National Trade Mark Register.
However, before it is entered, an act is enforceable against third parties who acquired rights after the date of that act but who were aware of it when those rights were acquired.
A licensee who is a party to a licence agreement that is not entered in the National or International Trade Mark Register is also entitled to intervene in infringement proceedings brought by the trade mark proprietor in order to obtain compensation for his own loss.