Copyright Act Article 40
In the case of a joint work, each author's share of the ownership of such a work shall be as stipulated by the joint authors; where no stipulation has been made, ownership shares shall be determined according to the degree of each author's creative contribution. Where the degree of each author's creative contribution is not clear, it shall be presumed that each author owns an equal share.Where an author of a joint work abandons its share of the ownership of the work, that share shall be apportioned among the other joint authors in proportion to their respective shares.The provisions of the preceding paragraph shall apply mutatis mutandis where the author of a joint work dies with no successor or is extinguished with no receiver.
中文原文 著作權法第40條
共同著作各著作人之應有部分，依共同著作人間之約定定之；無約定者，依各著作人參與創作之程度定之。
各著作人參與創作之程度不明時，推定為均等。
共同著作之著作人拋棄其應有部分者，其應有部分由其他共同著作人依其應有部分之比例分享之。
前項規定，於共同著作之著作人死亡無繼承人或消滅後無承受人者，準用之。
各著作人參與創作之程度不明時，推定為均等。
共同著作之著作人拋棄其應有部分者，其應有部分由其他共同著作人依其應有部分之比例分享之。
前項規定，於共同著作之著作人死亡無繼承人或消滅後無承受人者，準用之。