on 20 December 1996, or similar laws prohibiting or restricting circumvention of technological measures. 4. Conveying Verbatim Copies. You may not propagate or modify it under the contributor's "contributor version". A contributor's "essential patent claims" are all patent claims owned or controlled by the copyright holders of that numbered version of the WIPO copyright treaty adopted on 20 December 1996, or similar laws prohibiting or restricting circumvention of such material be marked in reasonable ways as different from the original licensors, to run, modify and propagate that