Any person who, on the occasion of any acts of transfer, concession or marketing of a variety benefiting from a plant variety certificate, wishes to make use of the option offered to him by Article L. 623-15 to attach a trademark or service mark to the variety denomination, whether this trademark is his own or has been granted to him, must take the necessary precautions, particularly in correspondence, advertising, in the drawing up of commercial catalogues, on packaging or labels, to ensure that this denomination is sufficiently apparent in its context so that no confusion is likely to arise in the mind of the buyer as to the identity of the variety.