California Code, Civil Code - CIV § 1798.69

(a) Except as provided in subdivision (b), the State Board of Equalization may not release the names and addresses of individuals who are registered with, or are holding licenses or permits issued by, the State Board of Equalization except to the extent necessary to verify resale certificates or to administer the tax and fee provisions of the Revenue and Taxation Code.

(b) Nothing in this section shall prohibit the release by the State Board of Equalization to, or limit the use by, any federal or state agency, or local government, of any data collected by the board that is otherwise authorized by law.