[HugoDaniel]

Yup, so Apple knows about your data.

And according to that slide they are a "provider" for NSA.

End-to-end encryption at least maybe guarantees that it is not your ISP that is selling you out to NSA (making it harder for Apple to explain why they are on that list).

[zimpenfish]

How does Apple know about your data unless they have B's key?

[HugoDaniel]

Who generates the keys for B ?