Kuzen was an informal form of official document that came into use from the mid Heian period -- which was used by shikiji (administrative assistant) at kurodo dokoro (the Office of Imperial Household Logistics) (shikiji kurodo, kurodo no to - Head Chamberlain) or goi no kurodo (Chamberlain of the Fifth Rank) in transcribing the verbally received emperor's edict for conveying it to shokei (high-ranking court noble) at Daijokan (Grand Council of State).
口宣（くぜん）とは、平安時代中期から用いられるようになった非公式な公文書書式で、天皇の勅旨を口頭で受けた蔵人所職事（職事蔵人・蔵人頭もしくは五位蔵人）がその内容を文書化して太政官上卿に伝える目的のために使われた。