Maryland Code, Business Regulation § 1-404

(1) is deceptive, immoral, or scandalous;

(2) may disparage, falsely suggest a connection with, or bring into contempt or disrepute:

(3) is, simulates, or includes a coat of arms, flag, or other insignia of a government;

(4) is or includes the name, portrait, or signature of a living individual, except with the written consent of the individual; or

(5) is likely, when applied to the goods or services of the person, to confuse or deceive because the mark resembles:

(c)(1) Unless the mark has become distinctive of the person's goods or services, a person may not register a mark that:

(2) As evidence that a mark has become distinctive of the goods or services of a person, the Secretary of State may accept proof that the person has used the mark as a mark in the State or elsewhere continuously for at least 5 years immediately before the day on which the person applies for registration.