sorry if this is in the wrong place! Okay so i have no clue how to do this but its just an idea. Lets say P1 makes a paid plugin called "lol123cool" but leaves the download free. When P2 downloads the plugin and puts it in his server it doesn't work. P2 double clicks on the plugin and a login message comes up saying enter username and password. But to make a username and password you have to pay a X amount of money. And if the account was ever logged from a different IP than the one it was registered it would be unusable. A link would be sent to the email it was registered in on how to unlock the account. Lets say P2 made an account by paying a X amount of money. He then logs in and boom! the plugin starts to work. Once again I have NO CLUE ON HOW THE HELL THIS WOULD BE MADE! but if it is possible or something this is a good idea, prob.