VISions or in the preceding articles, when the publisher carries out the complete destruction of the copies. Termination shall take place automatically when, upon formal notice by the author fixing a suitable period, the publisher has not effected publication of the work or, should the work be out of print, its republication. A work shall be deemed out of print if two orders for the delivery of copies addressed to the publisher have not been met within six months. If, in the event of the author's death, the work is incomplete, the contract shall be rescinded as regards the unfinished part of the work, except where otherwise agreed between the publisher and the author's successors in title. Article 57. The following shall not constitute publishing contracts within the meaning of Article 50: a contract for publication at the author's expense (" d compte d' auteur"). Under such con tract, the author or his successors in title pay to the publisher an agreed remuneration against which the latter manufactures copies of the work in the quantity, form and according to the modes of expression specified in the contract, and ensures its publication and dissemination. Such a contract shall constitute an agreement for work by contract; a shares contract ("de compte d demi"). Under such a contract, the author or his successors in title commission a publisher to manufacture, at his expense and in quantity, copies of the work in the form and according to the modes of expression specified in the contract, and to ensure their publication and dissemination in accordance with the agreement reciprocally contracted to share the profits and losses of exploitation in the agreed proportion. Such contract shall constitute a joint undertaking. Article 58. A stage performance contract is a contract under which the author of a work or his Successors in title authorize a natural or legal person to perform such work under the conditions they stipulate. Article 59. A general performance contract is a Contract under which the professional body of authors referred to in Article ()t) g,rants to all entert~inment promoter the right to perform, for the duratIon of the contract, the existing or future works Constituting the repertoire of such hody under the ~onditions stipulated by the author or his successors In title. In the case referred to above, the requirements of Article 44 may be waived. Article 60. An entertainment promoter who performs or has performed works protected under this Law shall be required to obtain prior authorization under Article 58 and to settle the corresponding royalties. The contract shall be concluded for a limited duration or for a specified number of communications to the public. Save where exclusive rights are expressly stipulated, the contract shall not afford to the entertainment promoter any exploitation monopoly. The entertainment promoter may not transfer the benefit of his contract without the formal consent in writing of the author or his representative. The entertainment promoter must ensure that the public performance takes place under technical conditions which guarantee respect for the author's intellectual and moral rights. The validity of the exclusive rights afforded by a playwright may not exceed five years. The interruption of performances for two consecutive years shall automatically terminate those rights. The entertainment promoter shall be required to inform the author, his successors in title, or the professional body of authors referred to in Article 68, of the exact program of public performances and to supply a documented statement of receipts and to pay to them, at the agreed times, the amount of the stipulated royalties. CHAPTER 9 Duration of Economic nights A rticlc 6!. The rights referred to in Article 28 shall be protected for the lifetime of the author and for 50 years after his death. Article 62. In the case of a work of joint authorship, the rights referred to in Article 28 shall be protected for the lifetime of the last surviving joint author and for 50 years after his death. Article 63. In the case of a work published anonymously or under a pseudonym, the rights referred to in Article 2t) shall be protected until expiry of a period of 50 years as from the date on which such work has been lawfully published for the first time. However, Article 61 shall apply where the identity of the author has been revealed or leaves no doubt prior to the expiry of such period. Article 64. In the case of a ciucmatogruphic work, the rights referred to in Article 21 shall be protected until expiry of a period of 50 years as from the making of the work or, if the work is made available to the public with the consent of the author