There is a rebuttable presumption that the information has not been published, disseminated, or otherwise become a matter of general public knowledge if the person has taken reasonable measures to prevent the information from becoming available to persons other than those selected by the person to have access to the information for limited purposes and the statement of justification contains a certification that the person has no knowledge that the information has ever been published, disseminated, or otherwise become a matter of general public knowledge.
225 ILCS 732/1-77