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Previously, standard Autocrypt rule was used to determine whether encryption is enabled: if at least one recipient does not prefer encryption, encryption is disabled. This rule has been problematic in large groups, because the larger is the group, the higher is the chance that one of the users does not prefer encryption. New rule requires a majority of users to prefer encryption. Note that it does not affect 1:1 chats, because it is required that *strictly* more than a half users in a chat prefer encryption.