The way I'd like to answer that question is actually by citing Parliament, frankly. If you look at the Access to Information Act, in section 69 that was referred to earlier—I will be quick—paragraph 69(3)(b) says that “discussion papers” introduced in cabinet are not “confidences of the Queen's Privy Council” and should be released if the decisions to which the discussion papers relate have been made public. Those are discussion papers, not the memorandum to cabinet.
On March 16th, 2011. See this statement in context.