N.D. Cent. Code § 41-03-63: (3-601) Discharge and effect of discharge

1.The obligation of a party to pay the instrument is discharged as stated in this chapter or by an act or agreement with the party which would discharge an obligation to pay money under a simple contract.

2.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.