It does not govern the content of a document, but rather how it is identified. You will notice that every news release issued by the public service or by a federal department is subject to the Communications Policy of the Government of Canada and the Federal Identity Program Policy. It bears two identifying features: the standard signature, which is the flag symbol with the institution's name—the department or the Government of Canada—and in the lower right....
On March 10th, 2011. See this statement in context.