Explain the 'Principles of Restrictions' under Foreign Trade Policy and Procedure.

Directorate General of Foreign Trade (DGFT) may, through a Notification, impose restrictions on export and import under Foreign Trade Policy and Procedure, necessary for: - on export of foodstuffs or other essential products for preventing or relieving critical shortages; on imports and exports necessary for the application of standards or regulations for the classification, grading or marketing of commodities in international trade; on imports of fisheries product, imported in any form, for enforcement of governmental measures to restrict production of the domestic product or for certain other purposes; on import to safeguard country's external financial position and to ensure a level of reserves; on imports to promote establishment of a particular industry; for preventing sudden increases in imports from causing serious injury to domestic producers or to relieve producers who have suffered such injury; for protection of public morals or to maintain public order; for protection of human, animal or plant life or health; relating to the importations or exportations of gold or silver; necessary to secure compliance with laws and regulations including those relating to the protection of patents, trademarks and copyrights, and the prevention of deceptive practices; relating to the products of prison labour; for the protection of national treasures of artistic, historic or archaeological value; for the conservation of exhaustible natural resources; for ensuring essential quantities for the domestic processing industry; essential to the acquisition or distribution of products in general or local short supply.