The layers may be encrypted using a separate key for {TAIL ~ each layer}, and {HEAD ~ rights} to a key granted by permission 
The layers may be encrypted using a separate key for { TAIL ~ each layer } , and { HEAD ~ rights } to a key granted by permission
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH