I seem to recall that "ownership" of the earth, by a country, starts at the centre of the earth, and ends at a Clarke orbit - hence certain countries on the equator supplementing their meagre GDPs by charging rent for GEO slots.
Where that's enshrined, or how correct I am, I've no idea.
And please don't apologise for posting about X-prize entries, I can't see that they belong anywhere else until Danny decides to start a "spaceflight" forum - which sadly I suspect isn't imminent.
G