Maryland Code, Economic Development § 10-634

(a) A pledge by the Authority of revenues or money deposited in the Baltimore City Public School Construction Financing Fund or the Supplemental Public School Construction Financing Fund as security for an issue of bonds is valid and binding from when the pledge is made.

(c) Notwithstanding any other provision of law, in order to perfect a lien on pledged revenues or money deposited in the Baltimore City Public School Construction Financing Fund or the Supplemental Public School Construction Financing Fund against a third person, it is not necessary to file or record any document adopted or entered into by the Authority in any public record other than in the records of the Authority.