First of all, there's a high degree of commercial confidentiality around the transaction, and that would be heightened in the case where there was a national security consideration being raised. It would be unlikely that either the investor or the Canadian business would have an incentive to make public the fact that it was the subject of a national security review or that national security considerations were dealt with in the context of a review of a transaction.
On May 21st, 2013. See this statement in context.