Normally they just invalidate the serial, so the purchaser or anyone else can no longer use it. Legal action is rare, because you have to prove they did it. Doubt gets introduced if anyone else has access to their things or computer, making it an uphill battle. Just like if a car is used in a crime, you cannot just charge the owner with the crime. (Before you mention speed cameras and traffic light cameras, their legality is in dispute in many areas for this reason)
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