One simple counter-example: down here in Brazil, the clause in Apple's OSX license "only run this in Apple hardware" is null and void (*). what you call the "clarification" is, effectively, here, one extra clause to the license.
(*) our Software Law grants us the right of modifying legally-acquired software in any way we need, if it is with the objective of making it run in our hardware and/or operating system, for our private use. (Law 9609/98, art. 6, IV)