Maryland Code, Corporations and Associations § 2-605

(a) Notwithstanding the provisions of § 2-604 of this subtitle, unless prohibited in the charter by reference to this section or the subject matter of this section, a majority of the entire board of directors, without action by the stockholders, may amend the charter of a corporation to:

(b) A change in the name or other designation of a class or series of stock under subsection (a)(2) of this section may not change the preferences, conversion or other rights, voting powers, restrictions, limitations as to dividends, qualifications, or terms or conditions of redemption of the class or series of stock.