1 buccaneer, sea rover, corsair, privateer, freebooter, sea-robber, filibuster, Archaic picaroon:
Captain Kidd and Blackbeard were actual pirates who looted shipping in the Americas in the 17th century
2 plagiarist, plagiarizer, infringer:
Some of these pirates offer unauthorized cheap reprints of expensive textbooks.
3 plagiarize, infringe, copy, reproduce, steal, appropriate, poach, Colloq lift, pinch, crib:
Our government has no jurisdiction over those who pirate books in countries with which we have no treaty.