II.-However, when a product is offered for sale to end users by means of a distance communication technique, or when it is offered for sale under physical conditions that do not allow it to be displayed, this information shall be brought to the attention of the purchaser in a precise manner by any means that can be proven, before the contract is concluded. III.-When a recording medium is sold to a professional purchaser, the information provided for in article R. 311-9 appears at the bottom of the invoice. This information is then supplemented by a reference to the option of reimbursement of the remuneration paid on the occasion of the purchase.