CONGO Law on Copyright and Neighboring Rights (No. 24/82 of July 7, 1982) * (Articles 49 to ]07) CHAPTER /) Authors' Contracts Article 49. Contracts by which an author or his successors in title authorize the performance or publication of his works shall be drawn up in writing, failing which they shall be void. The same shall apply to gratuitous authorizations to perform. Such contracts must state the type of exploitation and the mode of remuneration laid down by the author or his successors in title. They shall be subject to the law of civil and commercial contract. Transfer of authors' rights shall be subject to separate mention being made of each of the assigned rights in the instrument of assignment and to the field of exploitation of the rights being specified as to its scope, its purpose, the place and the duration. Article 50. A publishing contract is a contract under which the author of a work or his successors in title assign to the publisher, under specified conditions, the right to manufacture or have manufactured sufficient number of copies of the work, on condition that the latter ensures publication and dissemination thereof. Article 5]. A publishing contract must be in writing. The form and mode of expression, the terms of execution, of publication and, where applicable, of the termination clauses shall be specified in the contract. Article 52. The author shall be required to: guarantee the publisher the undisturbed and, except as otherwise agreed, exclusive exercise of the assigned right; have that right respected and defend it against any infringement; permit the publisher to fulfill his obligations and, in particular, deliver to him within the period of time stipulated in the contract the subject matter of the publication in a form permitting normal manufacture. Article 53. The publisher shall be required to carry out or have carried out the manufacture of the work in accordance with the conditions stipulated in the contract, to effect no modification of the work without written authorization from the author, to have, unless otherwise agreed, the name, pseudonym or symbol of the author appear on each of the copies, to effect publication, unless agreed otherwise, within the period of time that is usual in the trade and to ensure permanent and sustained exploitation of the work and commercial distribution in accordance with the practices of the trade. A rticle 54. The publisher shall also be required to provide accounts and appropriate proof to establish the accuracy of his accounts. Failing this, he shall be compelled to do so by the competent court. A rtlclc 55. Notwithstanding Article 44, it shall be unlawful for the author to give a publisher a right of preference for the publication of his future works of a given kind in excess of five new works for each kind as from the date of signature of the publishing contract concluded for the first work, or within a period of five years from that same date for the com pleted production. A rticlc 56. A publishing contract shall end, independently of the cases set out in general legal pro-