5. Deposit Accounts. Under new subsection (b)(1) [Maine cite subsection (2), paragraph (a)] , the only method of perfecting a security interest in a deposit account as original collateral is by control. Filing is ineffective, except as provided in Section 9-315 [Maine cite section 9-1315] with respect to proceeds. As explained in Section 9-104 [Maine cite section 9-1104] , "control" can arise as a result of an agreement among the secured party, debtor, and bank, whereby the bank agrees to comply with instructions of the secured party with respect to disposition of the funds on deposit, even though the debtor retains the right to direct disposition of the funds. Thus, subsection (b)(1) [Maine cite subsection (2), paragraph (a)] takes an intermediate position between certain non-UCC law, which conditions the effectiveness of a security interest on the secured party's enjoyment of such dominion and control over the deposit account that the debtor is unable to dispose of the funds, and the approach this Article takes to securities accounts, under which a secured party who is unable to reach the collateral without resort to judicial process may perfect by filing. By conditioning perfection on "control," rather than requiring the secured party to enjoy absolute dominion to the exclusion of the debtor, subsection (b)(1) [Maine cite subsection (2), paragraph (a)] permits perfection in a wide variety of transactions, including those in which the secured party actually relies on the deposit account in extending credit and maintains some meaningful dominion over it, but does not wish to deprive the debtor of access to the funds altogether.

6. Letter-of-Credit Rights. Letter-of-credit rights commonly are "supporting obligations," as defined in Section 9-102 [Maine cite section 9-1102]. Perfection as to the related account, chattel paper, document, general intangible, instrument, or investment property will perfect as to the letter-of-credit rights. See Section 9-308(d) [Maine cite section 9-1308, subsection (4)]. Subsection (b)(2) [Maine cite subsection (2), paragraph (b)] provides that, in other cases, a security interest in a letter-of-credit right may be perfected only by control.