An obligation arising by operation of law may be either a general legal duty imposed upon all persons indifferently by law or a legal duty affixed by operation of law to a status or relationship voluntarily assumed. Source: SDC 1939, § 47.0103.
Kinds of obligations arising by operation of law
SDCL § 20-1-3 — under THE NATURE OF OBLIGATIONS.
SDCL § 20-1-3