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