23 BOOK TWO MARKS, TRADENAMES, GEOGRAPHICAL INDICATIONS AND INDUSTRIAL DESIGNS Part I MARKS, TRADENAMES AND GEOGRAPHICAL INDICATIONS Article 63 A trademark is any sign distinguishing goods, whether products or services, and include in particular names represented in a distinctive manner, signatures, words, letters, numerals, designs, symbols, signposts, stamps, seals, drawings, engravings, a combination of distinctly formed colours and any other combination of these elements if used, or meant to be used, to distinguish the products of a particular industry, agricultural, forest or mining venture or any goods, or to indicate the origin of products or goods, or their quality, category, guarantee, preparation process, or to indicate the provision of any service. In all cases, a trademark shall be a sign that is recognizable by sight. Article 64 The Department of Trade Registry shall be competent to register the trademarks in the special register of such marks, in accordance with the provisions of this Law and its Regulations, without prejudice to the provisions of Articles 3 and 4 of Law No. 115 of 1958 on correspondence and signposts imposing the use of Arabic. Article 65 The person who has registered a trademark and who has made use of it for a period of five years as of the date of its registration shall be deemed the owner of such a trademark, unless precedence of use by a third party is proven. A prior user of the mark may, within the said period of five years, challenge the validity of its registration. The registration of a mark may, however, be challenged at any time, where the registration is made in bad faith. Article 66 Without prejudice to the provisions of international conventions in force in Egypt, any natural person or legal entity, Egyptian or foreign, belonging to or having the center of his or its effective