Md. Code, Alcoholic Beverages and Cannabis § 26–1509

(a) Except as provided in subsection (b) of this section, the Board may not issue a license that has an off–sale privilege to:

(1) an establishment commonly known as a chain store, supermarket, or discount house; or

(2) a franchisor, franchisee, or concessionaire of the establishment.

(b) An establishment described in subsection (a) of this section that held a license on July 1, 1973:

(1) may continue to hold the license; and

(2) at the discretion of the Board, may change the class of the license.