Earlier quoted context omitted.
Was that supposed to be a joke? Piracy is robbery at sea - ie stealing by force using a boat. It's like calling bullying 'murder'.
Check a recent dictionary. Take it up with Princeton if you don't like the definition: * (pirate) copy illegally; of published material * (pirate) someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation * (pirate) commandeer: take arbitrarily or by force; "The Cubans commandeered the plane and flew it to Miami"
Copyright infringement is just that, or 'unlawful copying' if you're afraid of longer words.