Maryland Transportation Section 13-201

      (a)      In this subtitle, "perfected", as used in reference to a security interest, means that it is valid against third parties generally, subject only to specific statutory exceptions.

      (b)      This subtitle does not apply to or affect:

            (1)      Any lien given by statute or rule of law to a supplier of services or materials for a vehicle;

            (2)      Any lien given by statute to the United States, this State, or any political subdivision of this State;

            (3)      Any security interest in a vehicle during any period in which the vehicle is inventory held for sale or lease by a person or leased by that person as lessor and that person is in the business of selling vehicles;

            (4)      Any lien arising out of an attachment of a vehicle;

            (5)      Any security interest claimed on proceeds, as that term is defined in Title 9 of the Commercial Law Article (Maryland Uniform Commercial Code -- Secured Transactions), if the original security interest did not have to be noted on the certificate of title in order to be perfected; or

            (6)      Any vehicle for which a certificate of title is not required under this title.