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