Maryland Commercial Law Section 12-1105
§ 12-1105.
  A rental-purchase agreement may not contain:
    (1)   A confession of judgment;
    (2)   A negotiable instrument;
    (3)   A security interest or any other claim of a property interest in any goods except the rental property delivered by the lessor pursuant to the rental-purchase agreement;
    (4)   A wage assignment;
    (5)   A waiver by the consumer of claims or defenses; or
    (6)   A provision authorizing the lessor or a person acting on the lessor's behalf to enter upon the consumer's premises or to commit any breach of the peace in the repossession of rental property.