law: 17. Power to prohibit forward contracts in certain cases.-
  (1) The Central Government may, by notification in the Official Gazette, declare that no person shall, save with the permission of the Central Government, enter into any forward contract for the sale or purchase of any goods or class of goods specified in the notification and to which the provisions of section 15 have not been made applicable, except to the extent and in the manner, if any, as may be specified in the notification.
  (2) All forward contracts in contravention of the provisions of sub-section (1) entered into after the date of publication of the notification thereunder shall be illegal.
  (3) Where a notification has been issued under sub-section (1), the provisions of Section 16 shall, in the absence of anything to the contrary in the notification, apply to all forward contracts for the sale or purchase of any goods specified in the notification 1[entered into on or before the date of the notification] and remaining to be performed after the said date as they apply to all forward contracts for the sale: or purchase of any goods specified in the notification under section 15.