letters patent (suomeksi)

valtakirja (s: type of legal document granting a right, monopoly, title, or status to a person or organization)
lupakirja (s: type of legal document granting a right, monopoly, title, or status to a person or organization)
patentti (s: type of legal document granting a right, monopoly, title, or status to a person or organization / depending on nature of doc.)