Because some of the owners of those works, the estates of deceased persons who were the authors of those works, would find their works immediately falling into the public domain, or very soon falling into the public domain, there was a concern that there should be transitional provisions.
Comme certains propriétaires de ces oeuvres, les successions des personnes décédées qui étaient les auteurs de ces oeuvres, verraient leurs oeuvres tomber immédiatement ou très rapidement dans le domaine public, on a cru devoir prévoir des dispositions de transition.