I think you could penetrate a lot of sources of information with warrants, and I think for the right of access under subclause 13(2), if you were to obtain a warrant from a Federal Court judge disclosing the reason why, you'd need to have, in my opinion, substantial grounds, but if the safety of the country were in some way endangered, you'd get a search warrant that would be similar to a warrant to search a residence. I think that with a warrant you could get this information.
For instance, solicitor-client information does not include the commission of a crime. If that communication discloses a crime, there's no protection. Similarly, I think a warrant would be sufficient. You'd need to have substantial grounds to convince a judge to give you the warrant, but once you had the warrant, you'd be entitled to that information.