California Code, Government Code - GOV § 10207

(b)(1) The Legislative Counsel shall maintain the attorney-client relationship with the Governor with respect to communications between the Governor and the Legislative Counsel. All materials arising out of this relationship, including, but not limited to, legal services concerning any bill in the Governor's hands for rejection, approval, or other action, legal services concerning any legal opinion provided to the Governor, and legal services concerning any matter as the circumstances permit and the Governor requests, prepared by the Legislative Counsel, are not public records, except when released by the Governor. When he or she determines that the public interest so requires, the Legislative Counsel may release any material arising out of the attorney-client relationship with a former Governor who is not available to execute a release.

(2) Whenever the Legislative Counsel issues an opinion to the Governor analyzing the constitutionality, operation, or effect of a bill or other legislative measure that is then pending before the Legislature, or of any amendment made or proposed to be made to that bill or measure, the Legislative Counsel shall deliver two copies of the opinion to the first-named author of the bill or measure as promptly as feasible after delivery of the original opinion, and shall also deliver a copy to any other author of the bill or measure who requests a copy.