How Apple's Advanced Data Protection Works, and How to Enable It on Your iPhone
Briefly

Without ADP enabled, this data is still encrypted, which adds a strong layer of protection from third parties or bad actors. But Apple can still access this data and turn it over to the cops.
If an Apple employee decides to go rogue, ADP will ensure your data is still safe. It also means Apple can't get your files back if you lose access to them.
Read at WIRED
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