California Code, Corporations Code - CORP § 25117

(a) An evidence of indebtedness, and the purchasers or holders thereof, shall be exempt from the usury provisions of Section 1 of Article XV of the California Constitution if (1) the evidence of indebtedness is rated or provisionally rated by Standard & Poor's Corporation as AAA, AA, A, BBB, or investment grade commercial paper, or by Moody's Investors Service, Inc. as Aaa, Aa, A, Baa, or investment grade commercial paper, including any such ratings with “+” or “-” designation or other variations that occur within these ratings, or has a rating or a provisional rating by another nationally recognized rating agency or system, which rating and agency or system have been certified by rule or order of the commissioner, or (2) the issuer thereof either (A) has any security listed or approved for listing upon notice of issuance on a national securities exchange, if the exchange has been certified by the commissioner, pursuant to subdivision (o) of Section 25100, or (B) meets each of the following requirements:

(b) This section creates and authorizes a class of transactions and persons pursuant to Section 1 of Article XV of the California Constitution.

(c) Any evidence of indebtedness issued in compliance with this section shall be entitled to the benefits of the usury exemption contained in this section regardless of whether subsequent to its issuance the evidence of indebtedness is determined by a court of competent jurisdiction to be a “security.”