In 1981 the Eaton Centre tied red bows on the geese while decorating.

The artist freaked out, said they were ruining the design, take them off.

The Eaton Centre said, “we paid you, now we own them, no”.

They argued and fought and took it to a judge, who sided with the artist.

And forever more the Canadian Copyright Law was changed: you can’t fuss with the art even after you buy it.  

This case is widely used today as an example: Snow VS The Eaton Centre.  Here’s the Wikipedia page.

Note the Canadian spelling of ‘centre’.