This contribution defines the legal status of copies from a copyright, contractual and tax law standpoint, as most artworks are not unique and may be duplicated (e.g. photographic prints produced based on the master negative, copies of a sculpture produced based on the master). The contribution also analyzes the legal consequences of this status (original or copies) on the acquisition contracts (in particular purchase agreement and certificate of authenticity), in particular when the artwork is supposed to be part of a limited edition (e.g. photographic print limited to 5 prints).