If that hash stuff actually works (identifies CSAM with high probability), then that puts Apple in the position of knowingly possessing CSAM. The "One Bad Apple" article a couple days ago mentions that their staff was sometimes exposed to CSAM but that it was unknowing, because the prior probability of an image they looked at being CSAM was quite low. If the probability was high (like > 50%?), it wounded like they would have been obligated to send it to NCEMC without looking at it.

https://www.hackerfactor.com/blog/index.php?/archives/929-On...