Thanks for your quick reply, Mark.

Nonetheless, I am still wondering: Does that mean that an app stored
as APK in /system/app/ can use any permission which is <=
"signatureOrSystem"? Or can only permissions == "signatureOrSystem" be
made use of? (the latter is definitely not the case, see below)

As I already mentioned, every app in /data/system/packages.xml which
was stored in /system/app/ had NO <perms>-Block. Not a single one. And
I highly doubt that preinstalled apps such as the Phone App only
utilize signatureOrSystem-Permissions. For example, the
android.permission.CALL_PHONE has a protectionLevel of "dangerous" and
is used by the preinstalled Phone app. However, this permission is not
denoted in /data/system/packages.xml for the Phone app.

Hence, I suspect that any app stored in /system/app/ is granted any
permission equal to or below "signatureOrSystem" level.

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