Proof by document or copy thereof
13.  Notwithstanding the provisions of the Evidence Act [Cap. 97], where in any proceedings any computer output is admissible in evidence in accordance with section 11, it may be proved —
(a)by the production of that computer output; or
(b)(whether or not that computer output is still in existence) by the production of a copy of that output, or of the material part of it,
authenticated in such manner as the court may approve.