Maryland Commercial Law Section 9-314

      (a)      A security interest in investment property, deposit accounts, letter-of-credit rights, electronic chattel paper, or electronic documents may be perfected by control of the collateral under § 7-106, § 9-104, § 9-105, § 9-106, or § 9-107.

      (b)      A security interest in deposit accounts, electronic chattel paper, letter-of-credit rights, or electronic documents is perfected by control under § 7-106, § 9-104, § 9-105, or § 9-107 when the secured party obtains control and remains perfected by control only while the secured party retains control.

      (c)      A security interest in investment property is perfected by control under § 9-106 from the time the secured party obtains control and remains perfected by control until:

            (1)      The secured party does not have control; and

            (2)      One of the following occurs:

                  (A)      If the collateral is a certificated security, the debtor has or acquires possession of the security certificate;

                  (B)      If the collateral is an uncertificated security, the issuer has registered or registers the debtor as the registered owner; or

                  (C)      If the collateral is a security entitlement, the debtor is or becomes the entitlement holder.