{HEAD ~ Implementations} may relate to {TAIL ~ various aspects} of modifying, or using, a coded bitstream, or to recovering watermarking information from data 
{ HEAD ~ Implementations } may relate to { TAIL ~ various aspects } of modifying , or using , a coded bitstream , or to recovering watermarking information from data
HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH