D.C. Code § 28:9-314: Perfection by control.

(a)

A security interest in controllable accounts, controllable electronic records, controllable payment intangibles, deposit accounts, electronic documents, electronic money, investment property, or letter-of-credit rights may be perfected by control of the collateral under § 28:7-106, § 28:9-104, § 28:9-105A, § 28:9-106, § 28:9-107, or § 28:9-107A.

(b)

A security interest in controllable accounts, controllable electronic records, controllable payment intangibles, deposit accounts, electronic documents, electronic money, or letter-of-credit rights is perfected by control under § 28:7-106, § 28:9-104, § 28:9-105A, § 28:9-107, or § 28:9-107A not earlier than the time 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 § 28:9-106 not earlier than 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.