Maryland Code, General Provisions § 4-355

(a)(1) In this section the following words have the meanings indicated.

(2) “Directory information” has the meaning stated in 20 U.S.C. § 1232g.

(3) “Personal information” means:

(1) require that a request to inspect a record containing personal information be made in writing and sent by first-class mail; and

(2) deny inspection of the part of the record containing the personal information if the information is requested for commercial purposes.