Upon request and at such reasonable charges as he prescribes by rule, the commissioner shall furnish to any person photostatic or other copies (certified under his seal of office if requested) of any document which is retained as a matter of public record, except that he shall not charge or collect any fee for photostatic or other copies of any document furnished to public officers for use in their official capacity. In any judicial proceeding or prosecution, any copy so certified is prima facie evidence of the contents of the document certified.