Maryland Commercial Law Section 13-317

      (a)      Except as provided in subsection (b) of this section, as a condition of accepting a credit card or device as payment for consumer credit, goods, realty, or services, a person may not record the address or telephone number of the credit card holder.

      (b)      A person may record the address or telephone number of a credit card holder if:

            (1)      The information is necessary for:

                  (i)      The shipping, delivery, or installation of consumer goods; or

                  (ii)      Special orders of consumer goods or services;

            (2)      Authorization from the credit card issuer as to the availability of credit is not required by the issuer to complete the credit card transaction; or

            (3)      The person processes credit card transactions by mailing transaction forms to a designated bankcard center for settlement.

      (c)      A person accepting a credit card or device as payment for consumer credit, goods, realty, or services may request that the credit card holder display a form of identification.