California Code, Government Code - GOV § 7924.000

(a) Except as provided in Section 2194 of the Elections Code, both of the following are confidential and shall not be disclosed to any person:

(b) The California driver's license number, the California identification card number, the social security number, and any other unique identifier used by the State of California for purposes of voter identification shown on an affidavit of registration, or added to the voter registration records to comply with the requirements of the federal Help America Vote Act of 2002 (52 U.S.C. Sec. 20901 et seq.), are confidential and shall not be disclosed to any person.

(c) The signature of the voter that is shown on an affidavit of registration is confidential and shall not be disclosed to any person.

(d) For purposes of this section, “home address” means street address only, and does not include an individual's city or post office address.