4.(1) A licence under this Act for any of the purposes specified in section 3 may be granted by the Government, and shall not be refused unless it appears to the Government that such refusal is necessary for the purpose of securing the observance of the obligations imposed by the Treaty; and, where a licence is granted subject to conditions, the conditions shall be such only as the Government may think necessary for the purpose aforesaid. (2) An application for a licence under this section shall be in such form and shall be accompanied by such designs and particulars as the Government may, by general or special order, require. (3) Any person who, in pursuance of a license granted under sub-section (1) ¹[* * *] is engaged in building any vessel of war or in altering, arming or equipping any ship so as to adapt her for use as a vessel of war, or is about to dispatch or deliver, or allow to be dispatched or delivered, from any place within Bangladesh any ship which has been so built, altered, armed or equipped, either entirely or partly, within Bangladesh, shall, upon written demand, furnish to the Government such designs and particulars as may be required by the Government for the purpose of securing the observance of the obligations imposed by the Treaty.