{HEAD ~ Rate shaping}, for example during transcoding, may be performed by {TAIL ~ intermediate network entities} without decrypting the layers 
{ HEAD ~ Rate shaping } , for example during transcoding , may be performed by { TAIL ~ intermediate network entities } without decrypting the layers
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH