Branding pluggins

Hi,

I once saw something – probably a plugin, but it could be a separate application, doesn’t matter – that was able to brand any plugin in such a way that people who activated it, in order to be able to use it, were obliged to register it with their name and email address.

Anybody who knows anything about IM will immediately realize that it was a brilliant idea for builiding a list. Sadly, at that time I had no money and not many attractive plugins to give to the people, or sell cheaply, and I didn’t buy it.

Now I regret and I am trying to find that plugin. Can anybody perhaps tell me where it hides?