20. (1) Any person who intends to use, in relation to any article or process or in the title of any patent, or in any trade mark or design, the Standard Mark shall apply to the Institution, in such form as may be prescribed, for grant of a licence for such use. (2) The Institution may grant a licence if, after such enquiry as it deems necessary, it is satisfied that-(a) the article or process in respect of which the Standard Mark is to be used conforms to the related Bangladesh Standard; and(b) there is arrangement for routine inspection and testing to ensure that the article or process concerned conforms to the related Bangladesh Standard. (3) A licence shall be granted in such form and on payment of such fee as may be prescribed, and may be subject to such conditions as may be specified therein by the Institution. (4) A licence granted under this section shall remain valid for a period of three years: Provided that the Institution may revoke the licence at any time, if it is satisfied that the licensee has violated any condition specified in the licence: Provided further that no licence shall be revoked unless the licensee is given a reasonable opportunity of being heard.