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by jedimastert 2011 days ago
Either the first party (i.e. the client) runs the data on their own turf or they hand the data to someone else (you or whatever third-party you use) and trust that the other end is going to treat your data right.

I'm sure there's some sort of homomorphic encryption[0] magic scheme that might let you process the data on other servers or something, but I could not even begin to tell you how. Really, it's just trust.