"Payment intangible" is a subset of the definition of "general intangible." The sale of a payment intangible is subject to this Article. See Section 9-109(a)(3) [Maine cite section 9-1109, subsection (1), paragraph (c)]. Virtually any intangible right could give rise to a right to payment of money once one hypothesizes, for example, that the account debtor is in breach of its obligation. The term "payment intangible," however, embraces only those general intangibles "under which the account debtor's principal obligation is a monetary obligation." (Emphasis added.)

In classifying intangible collateral, a court should begin by identifying the particular rights that have been assigned. The account debtor (promisor) under a particular contract may owe several types of monetary obligations as well as other, nonmonetary obligations. If the promisee's right to payment of money is assigned separately, the right is an account or payment intangible, depending on how the account debtor's obligation arose. When all the promisee's rights are assigned together, an account, a payment intangible, and a general intangible all may be involved, depending on the nature of the rights.

A right to the payment of money is frequently buttressed by ancillary covenants, such as covenants in a purchase agreement, note, or mortgage requiring insurance on the collateral or forbidding removal of the collateral, or covenants to preserve the creditworthiness of the promisor, such as covenants restricting dividends and the like. This Article does not treat these ancillary rights separately from the rights to payment to which they relate. For example, attachment and perfection of an assignment of a right to payment of a monetary obligation, whether it be an account or payment intangible, also carries these ancillary rights.

Every "payment intangible" is also a "general intangible." Likewise, "software" is a "general intangible" for purposes of this Article. See Comment 25. Accordingly, except as otherwise provided, statutory provisions applicable to general intangibles apply to payment intangibles and software.

e. "Letter-of-Credit Right." The term "letter-of-credit right" embraces the rights to payment and performance under a letter of credit (defined in Section 5-102). However, it does not include a beneficiary's right to demand payment or performance. Transfer of those rights to a transferee beneficiary is governed by Article 5. See Sections 9-107