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It is not copyrighted because (lacking an exception in statute like those for works of the Department of Toxic Substances Control or works of certain colleges established by statute) "unrestricted disclosure is required".
See County of Santa Clara v. CFAC. In brief, the "CPRA contains no provisions either for copyrighting [this work] or for conditioning its release on an end user or licensing agreement by the requester. The record thus must be disclosed as provided in the CPRA, without any such conditions or limitations." Subject to general disclaimers.