Md. Code, Commercial Law § 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.