Or just revise the law to state that international copyrights will only be enforced if they are held by Canadian trading partners in good standing, and that the only prosecutable violations of those copyrights are those which have taken place during the most recent contiguous period that that partner has been in good standing.

That way we don’t need to keep updating the law every time a trading partner starts/stops acting up, and other trading partners won’t need to worry about impacts to their IP. It will simply be baked in that every time a trading partner unilaterally breaks a trade agreement with us they will in effect be granting amnesty to every Canadian citizen who ever breached their copyright in the past and creating an open season on their IP within Canada until they can reach a new mutually acceptable trade agreement. Honestly this should be a standard practice for many countries.