If you were a nation wanting to enter the nuclear bomb-them-at-a-distance club, having the technical information about the tiles could really shorten your ICBM

If you were a nation wanting to enter the nuclear bomb-them-at-a-distance club, having the technical information about the tiles could really shorten your ICBM development time, and you'd have some measure of assurance they'd actually work (Columbia & Challenger not-withstanding)