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(a) Other law governs alienability; exceptions. Except as otherwise provided in subsection (b) and Sections 9–406, 9–407, 9–408, and 9–409, whether a debtor’s rights in collateral may be voluntarily or involuntarily transferred is governed by law other than this article.
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(b) Agreement does not prevent transfer. An agreement between the debtor and secured party which prohibits a transfer of the debtor’s rights in collateral or makes the transfer a default does not prevent the transfer from taking effect.