Re: Summary
"The USA wants strong controls over what they export and no controls over what we export"
It gets stranger and stranger though.
Stuff which has been taken into the USA may be prohibited from being carried back out, or in the case of data files, read by the very people who created them - on top of which, if a copy of your data makes it into the USA, even though you've never been there and your copy of the data still being yours on your desktop, can still result in you being charged with a US federal crime for giving a copy to your chinese colleague who likewise has never been anywhere near the USA and the entire data path not having been near the USA.
It's very much a case of "what's mine is mine, what's yours is mine too and I'll happily come and take it off you if I want it, no matter where you are" - in a lot of cases that means you should be doubly careful to ensure that your data doesn't _cross_ USA territories, let alone ever reside in them.