It did not authorize private trading but attempted to authorize only the official international tribute trading called sakuho system (the Chinese vassal system) (Kaikin Policy [the policy to forbid private people to trade with foreign countries]).
私的な交易は認めず、冊封体制と呼ばれる国家間の公式な朝貢貿易に限定しようとした（海禁政策）。