Maryland Code, Corporations and Associations § 5-506

(1) An amendment which alters the contract or property rights of any outstanding stock or of any member is not valid unless approved in person or by mail by the affirmative vote of:

(2) Notwithstanding any other provision of this article, the requirement of item (1) of this section for a two-thirds vote may not be lowered by the charter of the cooperative; and

(3) Any objecting member whose contract or property rights are substantially adversely affected by the amendment, on compliance with the provisions of Title 3, Subtitle 2 of this article, has the same rights with respect to his contract and property rights as an objecting stockholder has with respect to his stock.