California Code, Financial Code - FIN § 12318

(a) Any contract, promise to pay, or other instrument which has any blank spaces when signed by a debtor;

(b) Any negotiable instrument for the prorater's charges;

(c) Any note, wage assignment, real estate or chattel mortgage, or other security to secure the prorater's charges;

(d) Any confession of judgment or power of attorney to confess judgment against the debtor or to appear for the debtor in a judicial proceeding.

(e) Concurrent with the signing of the contract or as part of the contract or as part of the application for the contract a release of any obligation to be performed on the part of the prorater.