In principle, opening of the fudoso was not permitted except the time of emergency like famine in which foods must be given to the needy; in such a time the local governor must submit an official document called fudoso kaiken shinseige to Daijokan and if he got a permission along with the official document called fudokaiyofu or fudojufu, he was able to get the key to open the fudoso.
飢饉の際の賑給などの非常時に限って、令制国が不動倉開検申請解と呼ばれる解_(公文書)を太政官に提出して許可を求め、不動開用符または不動充符と呼ばれる太政官符の交付とともに鑰の返送を得ることで例外的に開封が認められた。