Maryland Code, Natural Resources § 4-807

(a) Any person desiring to engage in the business of picking, canning, or packing crabs, except a person picking and selling crab meat for local family trade, first shall obtain a license. “Local family trade” means the selling of picked crab meat directly to the consumer by the picker, with the meat being picked entirely from crabs harvested by the picker or family of the picker. Nothing in this section exempts persons engaged in picking, canning, or packing crabs from the applicable Maryland Department of Health requirements.

(b) This section does not require any person licensed to catch crabs to obtain a license to sell the crabs caught, or require a license for retail crab sellers who purchase crabs from a person licensed under this section.