Ripplin, those are licensed legal "digest" versions sold by Ken Films back in the day. (Starlog had similar ads.) They pop up on Ebay all the time as do many other films.
Long before there was home video, that's how people collected movies. UK companies like Derann still sell movies on Super 8 to this day! They even have ROTJ in all it's 1983 splendor. :)