modifying the directory manager file by deleting a reference to the target file, wherein {HEAD ~ the reference} includes {TAIL ~ a target file encryption key}; and 
includes
modifying the directory manager file by deleting a reference to the target file , wherein { HEAD ~ the reference } includes { TAIL ~ a target file encryption key } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH