Can I restrict where user's data can go?

The basic problem is that once an app can read data there is no technical way to prevent them from doing whatever they want with that data. We can and should write laws against data theft. We can and should develop a web of trust whereby apps that steal data are shunned. We can, with Solid make a robust system where only apps and people we choose can read our data and even that permission can be limited or removed.

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