Quit thinking about it like piracy, and the problem disappears. "But wait!" you say, "how will I feed my family?" Rather than discouraging piracy, you should be encouraging support from your audience. Add in a splash screen that can be disabled by the user once they paid/donated that encourages the purchace of a license, and what the support will go to. Throw your code up onto github or some other service and solicit for input from your audience, thus building a relationship with your audience, and even opening the doors for contribution in the form of code. It is far easier to give money to people who you actually have some form of relationship with. Things that don't bother people, but remind them, and encourage them to give the support you need is how you grow your body of support. Doing things to annoy people, will result in them not cooperating with you, and thus, doing things that one might consider piracy.