A debtor can transfer its rights in collateral even where its agreement with the secured party forbids it (section 9-401), and the secured party is not obligated on the debtor's contracts or in tort merely by holding a security interest (section 9-402). An account debtor's promise not to raise defences against an assignee can be enforced by an assignee that gave value in good faith without notice, subject to consumer law (section 9-403); otherwise the assignee takes subject to the terms of the contract and to defences and claims accruing before the account debtor receives authenticated notification of the assignment (section 9-404); modifications made in good faith before notification bind the assignee (section 9-405). After receiving an authenticated notification that reasonably identifies the assigned rights and directs payment to the assignee, the account debtor discharges its obligation only by paying the assignee, and may request reasonable proof of the assignment; contract terms and legal rules restricting assignment of receivables are ineffective to the extent sections 9-406 and 9-408 provide (section 9-408 giving the narrower override for promissory notes, payment intangibles, health-care-insurance receivables and other general intangibles, and section 9-407 for leases and section 9-409 for letter-of-credit rights).
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