Section 18
SEC. 18. The copyright secured by this Act shall endure for thirty years from the date it is registered. The proprietor of such copyright or his assigns or heirs shall be entitled to a renewal of the copyright for the further term of thirty years when application for such renewal shall have been made to the Philippine Library and Museum and duly filed therein within one year prior to the expiration of the original term of copyright. In default of the filing of such application for renewal the copyright in any work shall expire at the end of thirty years from the date it is registered. But in case of works in series or having several volumes or component parts registered at intervals the copyright shall endure for forty years from the time the copyright for the first series or volume or component part has been registered and may be renewed for the same period.