Perciflex

Hi guys, I would like to ask how is possible to legally sell Una/Dolphin permanent licenses? Im thinking about sell some of my permanent never expiring licenses which are valid for both - Una and Dolphin but found its quite complicated. Looks that I cant sell licenses itself, I can sell only whole Una account with all licenses in it as I found that info on old forum. Does somebody have more info about that? I asked Una staff but did not get any response in that matter so hopefully somebody in community can gimme a hand and explain it. Thanks