What are some of the most important decisions in the history of accessing access to information legislation?

A similar point was made in Maranda, a case which dealt with the disclosure of a lawyer’s billing records, where Lebel J., at para. 27, said: ... the most important of those judgments is undoubtedly the decision of the federal Court of Appeal in Stevens v. Canada (Prime Minister), 1998 CanLII 9075 (FCA), [1998] 4 F. C. 89. In that case, although it dealt with the problem of applying federal access to information legislation, Linden J.A. had concluded that the amount of fees fell within the framework of the solicitor-client relationship and had to be protected (paras. 29- 30). His reasons stressed the importance of the information that able counsel could sometimes extract from apparently neutral information such as the mere amount of the fees paid by opposing counsel’s client (para. 46).” (additional cites omitted)