maintaining the package identifier in a protected manner such that the package identifier is accessible to an operating system of {TAIL ~ the device} but not accessible to other applications of {HEAD ~ the device} 
maintaining the package identifier in a protected manner such that the package identifier is accessible to an operating system of { TAIL ~ the device } but not accessible to other applications of { HEAD ~ the device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD