Restriction on the summoning of trust servants to produce documents

Restriction on the summoning of trust servants to produce documents. No trustee or officer or servant of the trust shall in any legal proceeding to which the trust is not a party be required to produce any register or document the contents of which can be proved under the preceding section by a certified copy, or to appear as a witness to prove the matters and transactions recorded therein unless by order of the court made for special cause.