Under Canadian copyright law, so far as I understand it, as a party to the Berne Convention no copyright notice is needed as required by the "copyright must be automatic" clause. I'm not a lawyer, that's my interpretation, but if I'm right that would mean that very similar restrictions are in place for all other Berne Convention signatories, which is a respectable portion of the world. As far as I'm aware, again my own interpretations, the default copyright applied if not otherwise declared is "All Rights Reserved", which prohibits redistribution.
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