anti-competitive or in any manner restrain trade or are likely to have any of those effects. The empowered authority shall hear the allegations of the parties to the contract, if one or both so request, and shall take into account evidence that is pertinent provided by parties to the contract. Any decision to refuse to record the contract may be subject to administrative appeal or appeal to the competent tribunal respectively within one or two (2) months from the date on which the parties to the contract were notified of the empowered authority’s decision to refuse to record the contract . The assignment contract of registered mark will cease immediately to produce effects after invalidation by tribunals. Any change in ownership of a collective mark or in a collective mark application shall require the approval of the empowered authority. Article 160: License of a collective mark Collective mark which is registered, or for which registration is requested, may not be subject to a license contract. SECTION 8: CERTIFICATION MARKS Article 161: Common provisions for marks The provisions of articles 133 to 153 of this Law related to the mark shall apply to certification marks. Article 162: Specific provisions for certification marks Subject to the provisions of articles 133 to 1523of this Law, the application for the registration of a certification mark must designate the sign as a certification mark and shall be accompanied by the rules governing its use. These provisions apply to all certification marks, including those that are owned by governmental agencies. The owner of a certification mark may not use the sign to identify or certify his own goods or services. Any person who has proved to comply with the technical standards and other conditions of the rules mentioned in paragraph one of this article shall request and obtain the right to use the certification mark in the same conditions established by those rules. Article 163: Invalidation of registration In addition to the grounds provided for in article 149, the empowered authority shall invalidate the registration of a certification mark if the person requesting the invalidation proves that the owner of the certification mark uses it, or that he permits its use in contravention of the rules referred to in paragraph one of article 161 of this Law or that he or she permits its use in a manner liable to deceive trade circles or the public as to the origin or any other common characteristics of the goods or services concerned.