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