Simple antileak

[Vrekt]

Hello! So I was wondering if there was anyway to develop some form of simple antileak, basically just keeping the buyer from sharing it with friends. I'm not going to invest time in something more complex/secured because already its easy enough.

Any suggestions?

 

[Vrekt]

An IP Limiter?

--- EDIT ---

Nevermind, I see what you mean now. Thanks for the suggestion.