we didn't backdoor the encryption. instead, we specced how clients could securely pass attachment keys to an AV server, if they need to. but in practice none of

we didn't backdoor the encryption. instead, we specced how clients could securely pass attachment keys to an AV server, if they need to. but in practice none of them (other than the french app) do. the whole point was to spell out that we haven't backdoored the encryption, and instead been transparent about how content filtering could be done in the most responsible manner, if it's really needed.