[robertoandred]

And then Apple reviews the account and sees that what was flagged was not CSAM. And again, the hashes aren’t of arbitrary subject matter, they’re of specific images. Using that to police subject matter would be ludicrous.

[drampelt]

How would Apple know what the content was that was flagged if all they are provided with is a list of hashes? I completely agree it's ludicrous, but there are plenty of countries that want that exact functionality.

[gordon_gee123]

If they have the hash/derivative they dont need to look on device or even decrypt, theyll know that data with this hash is on device, and presumably 100s of other matching hashes from the same device

[robertoandred]

The matched image’s decrypted security voucher includes a “visual derivative.” I’m sure in other words they can do some level of human comparison to verify that it is or is not a valid match.