Subject to the requirement that such measures are not applied in a manner which would constitute a means of arbitrary or unjustifiable discrimination between countries where the same conditions prevail or a disguised restriction on international trade, nothing in this Agreement shall be construed to prevent any Party from imposing or enforcing measures: necessary to protect public morals, order or safety, human, animal or plant life or health or intellectual property; or relating to the products or services of handicapped persons, of philanthropic institutions or of prison labour.