Hello,

I have three questions related to signing some APK.

1) Is there any problem if an APK file has two or more valid
signatures?
    (I know jar-signer support multiple signatures in one apk file.)

2) Is there any problem if an APK file with 'android.uid.system' has
two or more valid signatures?

    Upgrading APK seemed to be working fine without any problems when
I tested it.

    Moreover, It worked well although only one signature within cert-
chain had been validated by PackageManager.
    And I confirmed the process ID assigned with 'system' properly in
linux-system-level.

    But is there any possibility that side-effect may occur?

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