It would need to be included in the law.
Certain artists will include it in their contracts. It is up to the seller or the reseller or the owner of the artwork to respect it or not. But definitely it cannot be left unlegislated. It has to be included in an act. I think the Copyright Act is the right place to do it, and now would be the best time for Canada to reach the international standards that are being established now, because 59 countries have it already.