California Code, Insurance Code - INS § 1874.3

(a) Any information acquired pursuant to this article shall not be a part of any public record.  Except as otherwise provided by law, any authorized governmental agency, an insurer, or an agent authorized by an insurer to act on its behalf, which receives any information furnished pursuant to this article shall not release that information to public inspection.

(b) The evidence or information described in this section shall be privileged and shall not be subject to subpoena or subpoena duces tecum in a civil or criminal proceeding unless, after reasonable notice to any insurer, agent authorized by an insurer to act on its behalf, and an authorized governmental agency which has an interest in the information, and a hearing, the court determines that the public interest and any ongoing investigation by the authorized governmental agency, insurer, or an agent authorized by an insurer to act on its behalf will not be jeopardized by its disclosure, or by the issuance of and compliance with a subpoena or subpoena duces tecum.