California Code, Penal Code - PEN § 929

As to any matter not subject to privilege, with the approval of the presiding judge of the superior court or the judge appointed by the presiding judge to supervise the grand jury, a grand jury may make available to the public part or all of the evidentiary material, findings, and other information relied upon by, or presented to, a grand jury for its final report in any civil grand jury investigation provided that the name of any person, or facts that lead to the identity of any person who provided information to the grand jury, shall not be released. Prior to granting approval pursuant to this section, a judge may require the redaction or masking of any part of the evidentiary material, findings, or other information to be released to the public including, but not limited to, the identity of witnesses and any testimony or materials of a defamatory or libelous nature.