Some services are theoretically safe. For instance, Apple's iMessage is designed in such a way that even Apple can't obtain the keys and crack codes. That sets up a potential conflict, however: what happens if Chinese courts order these services to fork over keys that they can't possibly deliver? While the odds of that happening aren't high (especially as the companies bring a lot of money to the country), they're high enough that they could make some tech giants uncomfortable. No matter what, there are some firms that now have to sacrifice your privacy if they want to continue operating in the world's most populous nation.

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