That's an interesting question. In a sense, to get into legal theory, all of the statutes of Canada are really one big law, and there's a presumption that they are meant to be understood in the context of the entire legislative text, in the context of the entire body of the law.
Therefore when we use concepts such as privacy and wording that is very similar to what one finds in numerous other statutes, including the Privacy Act, one imports the sense of those words, and judges, when they interpret them, understand that that's the spirit and the tone with which we intend them to be applied.