An exemplary digital rights management engine and related methods divides multimedia content into service level layers, encrypts at least some of the layers, and offers {HEAD ~ access} to {TAIL ~ the encrypted layers} by permission 
to
An exemplary digital rights management engine and related methods divides multimedia content into service level layers , encrypts at least some of the layers , and offers { HEAD ~ access } to { TAIL ~ the encrypted layers } by permission
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH