Maryland Statutes
Subtitle 6 - Discharge and Payment
Section 3-601 - Discharge and Effect of Discharge

(a)    The obligation of a party to pay the instrument is discharged as stated in this title 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.