Translate the following English sentence to French:
"One of the key topics which is still being discussed concerns the exemptions which can be made on copyright and, more specifically, exemptions for the benefit of technical copies, which are necessary to ensure that a free flow of data remains possible on the web."
L' un des sujets clés toujours en cours d' étude concerne les exceptions autorisées en matière de droits d' auteur et en particulier les exceptions relatives aux copies techniques, nécessaires pour permettre une libre circulation des données sur Internet.