Addendum: Apostille certification authorities in the U.S. can "Authenticate" a document for Canada. "Authentication" certifies a document has been properly notarized within the specific jurisdiction of that authority. Canadian authorities acknowledge and accept "Authentication" as proof of proper notarization.
In my Canadian experience, "Authenticated" documents are not given any more authority than their non-authenticated counterparts, at least not by knowledgeable persons. However, a glassy-eyed clerk who is trying to avoid the extra work of dealing with a foreign document can often be bullied into giving effect to an "authenticated" document as domestically acceptable, if one acts with an air of assured authority and unreasonable stubbornness.
Of course, this is a complete sidebar, as IRCC does not require "Authenticated" documents for citizenship submissions.
