California Code, Business and Professions Code - BPC § 8690

The board shall not issue any company registration under this chapter unless the applicant shall have filed with the board on a form prescribed by the board evidence of an insurance policy approved by the board as specified in this article, being in effect at the time of the issuance of the company registration.  This evidence shall include a provision that the board shall be given a 10-day notice by the insurance company should the policy be canceled or changed during the policy period in a manner as to affect the evidence.  Another method of deposit, including a certificate of deposit, or other undertaking shall not satisfy this requirement.