By including in the definition of "debtor" all persons with a property interest (other than a security interest in or other lien on collateral), the definition includes transferees of collateral, whether or not the secured party knows of the transfer or the transferee's identity. Exculpatory provisions in Part 6 protect the secured party in that circumstance. See Sections 9-605 and 9-628 [Maine cite sections 9-1605 and 9-1628]. The definition renders unnecessary former Section 9-112, which governed situations in which collateral was not owned by the debtor. The definition also includes a "consignee," as defined in this section, as well as a seller of accounts, chattel paper, payment intangibles, or promissory notes.

Secured parties and other lienholders are excluded from the definition of "debtor" because the interests of those parties normally derive from and encumber a debtor's interest. However, if in a separate secured transaction a secured party grants, as debtor, a security interest in its own interest (i.e., its security interest and any obligation that it secures), the secured party is a debtor in that transaction. This typically occurs when a secured party with a security interest in specific goods assigns chattel paper.

Consider the following examples: