11 Article : 18 The electronic signature, electronic writing, and electronic documents shall enjoy their conclusiveness in providing evidence in case they fulfill the following conditions: a) Linkage of the electronic signature exclusively with the signer; b) Control of the signer exclusively on the electronic medium; c) The possibility of uncovering any modification or replacement in the data of the electronic document or electronic signature; The executive regulations of the present Law shall determine the technical and technological regulators necessary therefor. Article : 19 Exercising the activity of issuing the electronic ratification certificates shall only be with a license from the Authority, in return for a charge to be determined by its board of directors according to the procedures, rules and guarantees to be determined in the executive regulations of the present Law, and without being restricted by the provisions of Law No. 29 for the year 1947 concerning Public Facilities Obligations, and subject to the following: a) Electing the licensee shall take place within a context of competition and publicity; b) The board of the Authority shall determine the license validity period providing it shall not exceed ninety nine years; c) Determining the means of technical and financial supervision and monitoring that ensures the good progress of the facility regularly and progressively. Exercising the licensed activity shall not be interrupted, nor shall the activity be merged with another quarter, or the license be relinquished