Article 4. Signature And Display Of Licenses of California Vehicle Code >> Division 6. >> Chapter 1. >> Article 4.

(a) Every person licensed under this code shall write his or her usual signature with pen and ink in the space provided for that purpose on the license issued to him or her, immediately on receipt thereof, and the license is not valid until so signed, except that if the department issues a form of license which bears the facsimile signature of the applicant as shown upon the application, the license is valid even though not so signed.
  (b) For purposes of subdivision (a), signature includes a digitized signature.

(a) The department shall require digitized signatures on each driver's license. A digitized signature is an electronic representation of a handwritten signature.
  (b) The department shall provide to the Secretary of State the digitized signature of every person who registers to vote on the voter registration card provided by the department.
  (c) The department shall provide the Secretary of State with change-of-address information for every voter who indicates that he or she desires to have his or her address changed for voter registration purposes.

(a) The licensee shall have the valid driver's license issued to him or her in his or her immediate possession at all times when driving a motor vehicle upon a highway. Any charge under this subdivision shall be dismissed when the person charged produces in court a driver's license duly issued to that person and valid at the time of his or her arrest, except that upon a third or subsequent charge the court in its discretion may dismiss the charge. When a temporary, interim, or duplicate driver's license is produced in court, the charge shall not be dismissed unless the court has been furnished proof by the Department of Motor Vehicles that the temporary, interim, or duplicate license was issued prior to the arrest, that the driving privilege and license had not been suspended or revoked, and that the person was eligible for the temporary, interim, or duplicate license.
  (b) The driver of a motor vehicle shall present his or her license for examination upon demand of a peace officer enforcing the provisions of this code.

A licensee shall display his driver's license upon request of a magistrate or judge before whom he may be brought for violation of any traffic law.

In any circumstances involving accidents or violations in which the engineer or any other crewmember of any train is detained by state or local police, the engineer or any other crew member shall not be required to furnish a motor vehicle operator's license, nor shall any citation involving the operation of a train be issued against the motor vehicle operator's license of the engineer or any other crew member of the train.