How can I complain to who cracked my program?

[Ali Asghar Toraby Parizy <aliasghar.toraby () gmail com>]

Hi
I created an application and have started a marketing in my site. I
sell it using my website.
I use fingerprint to authorize my customers and I give them specific
serial numbers. Recently I discovered that a strange person have
cracked my program and generated a keygen for that.  I don't know him.
I saw that keygen in a warez site.
How can I complain? Do I have to register my program in an association
to pursue that person? Where do I have to prefer to criticize this
illegal exploit?
Thanks for any help

--
Ali Asghar Torabi

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