Md. Code, Business Regulation § 6–603

(a) A professional solicitor or fund-raising counsel may not make an agreement with a charitable organization unless the charitable organization has applied to register with the Secretary of State or is otherwise exempt.

(b) A charitable organization may not make an agreement with a professional solicitor or fund-raising counsel unless the professional solicitor or fund-raising counsel has applied to register with the Secretary of State or is otherwise exempt.