Found some weird copyright link for a bunch of Canadian show

This is a link to the Canadian government's copyright database. It is a list of works whose owners have filed a form entitled "Release and Termination of Security Interest in Intellectual Property" with the federal government.

I'm not a copyright lawyer, but I think this means the copyright holders are no longer interested in their previous security agreements. They seem to be filed in batches. Clicking on a number shows a list of shows that all had the same paperwork number.

Releasing the agreements may not mean they are in the public domain. The items appear to be filed by an agency.

Security agreements can also relate to trademarks. www.lawinsider.com/dictionary/canadian-intellectual-property-security-agreements

They can also be related to Canadian distribution of shows. There's a listing for Arthur, which was made by PBS.