olemus
Wiktionary, adj:
of, relating to, enacted or regulated by a statute
(statute = written law, as laid down by the legislature)
https://en.wikipedia.org/wiki/Statute

statutory audit -- kohustuslik audit
statutory force -- seadusejõud
statutory insurance -- sundkndlustus
statutory rules and orders -- seadusejõuga normatiivaktid
statutory social insurance -- kohustuslik sotsiaalkindlustus