Difference between preinstalled and privileged protection level

Question

API 23 has renamed permission protection level system into privileged. It has also introduced a preinstalled protection level.

Does privileged implies preinstalled? In other words, if an application has access to privileged permissions (i.e. it is a system application), does it have access to preinstalled permissions as well, even if those permissions are not listed as privileged (only preinstalled)?

Answer 1

It's possible for apps to be pre-installed but not have elevated system permissions (e.g. Calculator). This is why the distinction is present between these two flags and why system protection level has been deprecated for privileged.