California Code, Elections Code - ELEC § 2262

(a) “Completed voter registration” and “completed voter registration application” mean the part of the driver's license application containing the voter registration application for an applicant who has not affirmatively declined to register to vote, the transmittal of which is not prohibited by subdivision (f) of Section 2265, and which includes the minimum information necessary to prevent duplicate voter registrations and preregistrations, to assess the eligibility of the applicant, and to administer voter registration, preregistration, and other procedures for elections.

(b) “Department” means the Department of Motor Vehicles.

(c) “Driver's license application” means a driver's license or identification card application, renewal, or notification of a change of address pursuant to Section 12800, 12815, 13000, or 14600 of the Vehicle Code.