In the Edo period, Norinaga MOTOORI, who presented a theory on Fukai-no-Joten/ Fukaijoten (The Irreversible Permanent Code), advocated in his books "Shokki Rekicho Shoshikai" and "Shokki Senmyo Monmoku," that it refers to a series of laws instituted during the Taika Reforms.
江戸時代に不改常典（かはるまじきつねののり）に関する学説を示した本居宣長は、『続記歴朝詔詞解』と『続紀宣命問目』で、大化改新の諸法を指すと解した。