Where a registered layout-design, or a semiconductor integrated circuit in which a registered layout-design is incorporated, or an article incorporating such a semiconductor integrated circuit is sold or has been contracted for sale, the seller shall be deemed to warrant that the registration, of such layout-design or the layout-design so incorporated is genuine within the meaning of this Act unless the contrary is expressed in writing signed by or on behalf of the seller and delivered at the time of the sale or contract to sell of such layout-design, or semiconductor integrated circuit or article, as the case may be, and accepted by the buyer.