Kaapvaart means privateering.
Kaapvaart was a form of legal piracy in war time. The government would recruit private ships as part of the war effort by giving the captain a license to attack the enemy and steal from them. The proceeds were shared between the privateer and the government.

Battle between 5 privateers from Zeeland and 8 Portuguese ships off the coast of Brazil, 1657. Credits: Jan Luyken, collection Rijksmuseum (public domain)
