http://developer.android.com/guide/topics/manifest/permission-element.html
"signatureOrSystem" A permission that the system grants only to applications that are in the Android system image or that are signed with the same certificates as those in the system image. I guess the above statement is a bit misleading. "that are signed with the same certificates as those in the system image. " Indeed, they must be signed by the same certificate, but not necessary by one from the system image. Basically, this is the equivalent of the protection level "signature". However, the above statement assumes that "signatureOrSystem" protected permissions are only declared by applications located in the system image. guillaume
