Section 48--Registered users--(1) Subject to the provisions of section 49,a person other than the registered proprietor of a trade mark may be registered as the registered user thereof in respect of any or all of the goods in respect of which the trademark is registered otherwise than as a defensive trade mark; but the Central Government may,by rules made in this behalf,provide that no application for registration as such shall be enertained unless the agreement between the parties complies with the conditions laid down in the rules for preventing trafficking in trade marks