Certain exceptions to the baseline rule enable a debtor to transfer, and a security interest to attach to, greater rights than the debtor has. See Part 3, Subpart 3 (priority rules). The phrase, "or the power to transfer rights in the collateral to a secured party," accommodates those exceptions. In some cases, a debtor may have power to transfer another person's rights only to a class of transferees that excludes secured parties. See, e.g., Section 2-403(2) (giving certain merchants power to transfer an entruster's rights to a buyer in ordinary course of business). Under those circumstances, the debtor would not have the power to create a security interest in the other person's rights, and the condition in subsection (b)(2) [Maine cite subsection (2), paragraph (b)] would not be satisfied.

7. New Debtors. Subsection (e) [Maine cite subsection (5)] makes clear that the enforceability requirements of subsection (b)(3) [Maine cite subsection (2), paragraph (c)] are met when a new debtor becomes bound under an original debtor's security agreement. If a new debtor becomes bound as debtor by a security agreement entered into by another person, the security agreement satisfies the requirement of subsection (b)(3) [Maine cite subsection (2), paragraph (c)] as to the existing and after- acquired property of the new debtor to the extent the property is described in the agreement.

Subsection (d) [Maine cite subsection (4)] explains when a new debtor becomes bound. Persons who become bound under paragraph (2) [Maine cite paragraph (b)] are limited to those who both become primarily liable for the original debtor's obligations and succeed to (or acquire) its assets. Thus, the paragraph excludes sureties and other secondary obligors as well as persons who become obligated through veil piercing and other non- successorship doctrines. In many cases, paragraph (2) [Maine cite paragraph (b)] will exclude successors to the assets and liabilities of a division of a debtor. See also Section 9-508 [Maine cite section 9-1508], Comment 3.

8. Supporting Obligations. Under subsection (f) [Maine cite subsection (6)], a security interest in a "supporting obligation" (defined in Section 9-102 [Maine cite section 9-1102]) automatically follows from a security interest in the underlying, supported collateral. This result was implicit under former Article 9. Implicit in subsection (f) [Maine cite subsection (6)] is the principle that the secured party's interest in a supporting obligation extends to the supporting