57A-3-601. Discharge and effect of discharge.(a) The obligation of a party to pay the instrument is discharged as stated in this article or by an act or agreement with the party which would discharge an obligation to pay money under a simple contract.(b) Discharge of the obligation of a party is not effective against a person acquiring rights of a holder in due course of the instrument without notice of the discharge. Source: SL 1994, ch 367, §3-601.
South Dakota Legal Code