*EDL! ... where I worked for marginally over 14 years - from March 3, 1975 until April 18, 1989 - as Records Officer for Social Services at Perth Prison, *these initials were an abbreviation for 'Earliest Date of Liberation' ...

... ... unless, of course, an inmate was serving a full "Life Sentence" ... in which case, his eventual release date would,
for the most part, be indeterminate.