Sanctions can be imposed for cultural reasons when a smaller country or cultural traditions feels that an imported culture in overwhelming an indigenous one. There are two particularly important cases of restricts on cultural trade, as it were, in Canada.
Canada has a history of worrying about being overwhelmed by the United States culturally. Because the US has ten times the population of Canada, and is both an economic and military hyperpower, it tends to dominate the North American Anglosphere, and thus Canada attempts to restrict imports of US culture (especially TV and radio) and insist on percentages of Canadian content.
A second issue is Quebec and the perceived economic and cultural marginalization of Francophone Canada, leading to an asymmetrical federalism in bilingual regulations focussed on the preservation of French Canadian culture.
In both the cases, trade restrictions stem from cultural rather than economic issues.