I don't know if it really fits here, but what I want to know is what do you do when you find a hack being hosted on a website? What's even worst is that it's not a patch or serial number, it's the whole damn program. Since PPC apps are small, they just release the whole damn thing patched so even if you change/recompile it does nothing to stop them from releasing a full copy of our apps.
Do you have a website address where this product is being distributed illegally?
Not knowing what type of application this is - we can only offer an assumptive opinion.
The players whom rip applications are the minority and most likely never pay, regardless, they find a way.
You need to weigh the costs involved in your time, energy and legal fees to follow through with a cease order.
Should you decide to send them a written notification by email and via certified snail mail (look for their mailing address under the website owner information as found under regnow.com)insisting they remove your product immediately.
If they do not comply within a set amount of time and you elect to do so - you can always contact a Copyright Attorney in or around Virginia, as the Courthouse is nearby, and discuss with them the option to file a legal complaint in Superior Court charging said "Website and Company Owners" with Copyright and Intellectual Property Rights Violation and in affect seek to shut down their website.
Please note PocketMatrix is not providing Legal Advise and can only offer opinions in a open discussion format.
Good luck and let us know what happens!