When a security agreement is valid and what other laws apply

(a) Except as otherwise provided in this chapter, a security agreement is effective according to its terms between the parties, against purchasers of the collateral, and against creditors. (b) A transaction subject to this article is subject to: (1) Any applicable rule of law which establishes a different rule for consumers; (2) Any other statute or regulation that regulates the rates, charges, agreements, and practices for loans, credit sales, or other extensions of credit; and (3) Any consumer-protection statute or regulation. (c) In case of conflict between this article and a rule of law, statute, or regulation described in subsection (b), the rule of law, statute, or regulation controls. Failure to comply with a statute or regulation described in subsection (b) has only the effect the statute or regulation specifies. (d) This article does not: (1) Validate any rate, charge, agreement, or practice that violates a rule of law, statute, or regulation described in subsection (b); or (2) Extend the application of the rule of law, statute, or regulation to a transaction not otherwise subject to it.