So-called “private apps” on Android have permissions exceeding those of normal “system apps”, and they have to be signed with the “platform key”, which is only possible having access to the manufacturer’s “private key” (https://en.wikipedia.org/wiki/Public-key_cryptography).
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В двух аэропортах на юге России ввели ограничения на полеты14:55
Alternates checking/inference modes; scales to dependent types