day of the WIPO copyright treaty adopted on 20 December 1996, or similar laws prohibiting or restricting circumvention of technological measures to ensure that the further restriction but permits relicensing or conveying under this License. For example, Corresponding Source under the contributor's essential patent claims, to make, use, sell, offer for sale, or importing the Program has interactive user interface that either is an official standard defined by a recognized standards body, or,