Good book thanks. I keep refering to it.
Concerning the licence attached ,Its always seemed to me like saying "I will give you this gun and amunition on condition you don't shoot me with it."
Trying to enforce it in another country would be expensive and mostly futile I would suspect unless there were reciprocal legal agreements between Governments- treaty's etc.
After all ,once you give something away you lose all rights over it . Ignoring what laws may or may not have been passed for copyright ,if you don't give something entirely then you don't give it at all in my book.