Cal. Code Regs. tit. 11 § 6
If the application for "leave to sue" be granted, the relator must, within 10 days after receiving notice of such action (unless further time be granted), present to the Attorney General an undertaking executed to the State of California in the sum of $500, to the effect that the relator will pay any judgment for costs or damages that may be recovered against the plaintiff, and all costs and expenses incurred in the prosecution of the proceeding in which such "leave to sue" is granted. The sureties upon the undertaking shall be approved by the Attorney General.
Upon receipt and approval of said undertaking, the Attorney General will transmit to the relator, in writing, "leave to sue" in the name of the people, which "leave to sue" shall be filed with the clerk of the court simultaneously with the filing of the complaint.
Cal. Code Regs. Tit. 11, § 6