Md. Code, Pub. Util. § 10-502

(a) A person may not operate a vehicle that provides passenger–for–hire services in the State: (1) unless the person is licensed as a passenger–for–hire driver by the Commission, including a person who is licensed or otherwise authorized by the Commission as a transportation network operator, transportation network partner, or transportation network driver; or (2) in violation of this title or Title 9, Subtitle 2 of this article. (b) A person may not operate a vehicle that provides taxicab services in the State: (1) unless the person is licensed as a taxicab driver by the Commission or a county or municipal corporation; or (2) that is under the jurisdiction of the Commission, in violation of this title. (c) A person may not operate a transportation network company in the State unless the person has been issued a permit as a transportation network company by the Commission. (d) Subject to the hearing provisions of § 3–102(c) of this article, the Commission may impose on a person who violates this section a civil penalty not exceeding $500 for each violation.