In the case of an audio-visual work, the rights of the author referred to in section 5 are protected until the expiration of seventy years from the date of the making of the work, or where the work is made available to the public during that period with the consent of the author, until the expiration of seventy years from the date on which the work was either made, first made available to the public, or first published, whichever date is the later.