17 C.F.R. § 246.10
(a) Definitions. For purposes of this section, the following definitions shall apply:
Municipal security or municipal securities shall have the same meaning as the term “municipal securities” in Section 3(a)(29) of the Securities Exchange Act of 1934 (15 U.S.C. 78c(a)(29)) and any rules promulgated pursuant to such section.
Qualified tender option bond entity means an issuing entity with respect to tender option bonds for which each of the following applies:
(ii) Such entity issues no securities other than:
Tender option bond means a security which has features which entitle the holders to tender such bonds to the issuing entity for purchase at any time upon no more than 397 days' notice, for a purchase price equal to the approximate amortized cost of the security, plus accrued interest, if any, at the time of tender.
(b) Risk retention options. Notwithstanding anything in this section, the sponsor with respect to an issuance of tender option bonds may retain an eligible vertical interest or eligible horizontal residual interest, or any combination thereof, in accordance with the requirements of § 246.4. In order to satisfy its risk retention requirements under this section, the sponsor with respect to an issuance of tender option bonds by a qualified tender option bond entity may retain:
(e) Disclosures. The sponsor shall provide, or cause to be provided, to potential investors a reasonable period of time prior to the sale of the asset-backed securities as part of the securitization transaction and, upon request, to the Commission and its appropriate Federal banking agency, if any, the following disclosure in written form under the caption “Credit Risk Retention”: