The Sound Dues law, enacted in the 15th century, imposed a tariff on all ships passing through the Øresund Strait, with the amount of the toll determined by the type and size of the vessel. The law applied to both domestic and foreign ships, with certain exceptions for ships in distress or those carrying goods for the Danish monarch. The tolls were collected by the Danish authorities at designated collection points along the strait. The revenue generated from the Sound Dues was used to maintain the strait and surrounding infrastructure.
This law required ships to pay a fee when passing through the Øresund Strait, with the money used to keep the strait safe and maintained.