Lost Chronicles of Zerzura uses a keycode but I could not find anything on the internet nor at the Viva Media site that states that once you activate it, it's yours (like Steam). You can put the keycode in on- or off-line, so I chose off-line. My husband has listed it on Amazon to sell used but he was thinking maybe he should take his listing off. Does anyone know if this game could be used by more than one owner? Thanks for any help.