And in order to avoid one's domain being confiscated into Koryo (an Imperial demesne), they donated their land as shoen (manor in medieval Japan) to Juryoso (career provincial class) and paid a certain amount of tax to Juryoso, maintaining effective dominion on the land as shokan (an officer governing shoen), which is called contribution with reserving authority.
自領が公領に収公されることを防ぐため、その土地を荘園として受領層に寄進し、自らは荘官として土地の実効支配権を持ちながら、一定の税を寄進先の受領層に納めた（職権留保付寄進）。