Under Article 12 of Royal Decree No. 929 of 21 June 1942, the owner of a trade name may apply the latter to the products offered for sale by adding it to the manufacturer's trademark. This provision, which is not mandatory as to its nature, cannot result in affecting the knowledge or distinctiveness acquired by the trademark, since a producer who is the owner of a trademark has the right to prescribe modalities for the use of such trademark by the seller and all subsequent dealers (see judgment No. 3211 of 15 May 1986 by the Court of Cassation, Civil Section - Division II). Furthermore, it is prohibited to make use of one's own trademark in a manner capable to mislead the public, especially as regards nature, quality or origin of a product (Article 11 of Royal Decree No. 929 of 21 June 1942, as replaced by Article 12 of Legislative Decree No. 480 of 4 December 1992).