I like the way that David over at phplinkdirectory has his purchase/licensing script set up, however, i believe that was a custom job. Does anyone know of either a joomla add on that can do that OR a php script that people can login and pay for a licensed copy of a script and track which script they purchased? Pirates will be pirates, i understand that, however, i'm doing my due diligence now to try to make this launch as smooth as possible.
Script is an article selling script. Membership and commission based. Think "article directory" but you can sell/buy articles.
if you want a free method, encode it with ioncube and lock it to a domain/ip/server or if you want a great one, like user signup/billing and automated licencing then i would reccomend phpAudit