I agree with others saying "do nothing"... mostly. Trying to prevent piracy is a waste of time and resources better spent on people who actually pay you money.

I agree with others saying "do nothing"... mostly. Trying to prevent piracy is a waste of time and resources better spent on people who actually pay you money. To that end, if you do anything, the goal should be to ensure that you can tell the difference between who is paying and who isn't. You don't want to field support for cracked copies. Some developers I know and will not name have been known to leak their own cracked copies of their product, just to ensure that there is something broken about them that easily identifies them as a cracked copy.