Cal. Veh. Code § 11400
No person shall act as a registration service, engage in the business of soliciting or receiving any application for the registration, renewal of registration, or transfer of registration or ownership of any vehicle of a type subject to registration under this code, or of soliciting or receiving an application for a motor carrier permit under Division 14.85 (commencing with Section 34600), or transmit or present any of those documents to the department, if any compensation is solicited or received for the service, without a license or temporary permit issued by the department pursuant to this chapter, or if that license or temporary permit has expired or been canceled, suspended, or revoked, or the terms and conditions of an agreement entered into pursuant to Section 11408 have not been fulfilled.
Ca. Veh. Code § 11400