California Code, Penal Code - PEN § 1054.10

(a) Except as provided in subdivision (b), no attorney may disclose or permit to be disclosed to a defendant, members of the defendant's family, or anyone else copies of child pornography evidence, unless specifically permitted to do so by the court after a hearing and a showing of good cause.

(b) Notwithstanding subdivision (a), an attorney may disclose or permit to be disclosed copies of child pornography evidence to persons employed by the attorney or to persons appointed by the court to assist in the preparation of a defendant's case if that disclosure is required for that preparation.  Persons provided this material by an attorney shall be informed by the attorney that further dissemination of the material, except as provided by this section, is prohibited.