transferred save in favour of the commercial firm or enterprise whose products are distinguished by such trademark. Article (17) Transfer of ownership of a commercial concern or enterprise shall entail transfer of all marks registered in the name of the transfer or which may be deemed closely connected to the concern or enterprise unless otherwise is agreed. Where ownership of the commercial concern or enterprise has been transferred exclusive of the relative trademark, the enterprise may continue to produce and trade in the same products in relation of which such trademark was registered unless otherwise is agreed. Article (18) Transfer of title to a trademark or mortgage thereof shall not be used as evidence against third parties until after it has been duly entered in the register and published according to the methods prescribed by the executive regulations. Part IV Renewal & Cancellation Article (19) The protection period of a registered trademark shall be ten years. The holder of a title to the registered trademark may obtain a renewal of such period if he submits an application for renewal during the last year, subject to the provisions of Article 6. Likewise, further renewals may be granted at the end of each succeeding period subject to the same procedure. In the course of the first month immediately following the expiry of the period of legal protection, the registration office shall notify the proprietor of the trademark in writing of the expiry of the period of protection. Such notification shall be forwarded by registered mail to the address shown in the register. Wherein no application for renewal has been tendered by the proprietor of the trademark within the three months commencing from the date of expiry of protection thereof, the office shall ex officio cancel the trademark from the register. Article (20) The court of first instance may, upon the application of any person concerned, order the cancellation of registration where it is satisfied that the trademark in question has not been seriously used for five consecutive years unless the proprietor of the marks shows a reasonable cause for non-use. Article (21) Where cancellation of registration of a trademark has been duly entered, such trademark shall not be registered in favour of other persons, for use in relation to the same products save after a period of three years from the date of cancellation has elapsed. Article (22) The cancellation of the registration or its renewal should be published in the manner which the implementing regulations shall stipulate. Article (23) The implementing regulations to this Law shall provide for the temporary protection necessary for trademarks used on any products or goods displayed in industrial and agricultural exhibitions held in Libya provided that such trademarks are entitled to protection in their respective countries of origin and not withstanding that the products