Intermediate Publishing (China) Practice Questions - National Qualification Examination For Intermediate Publishing Professionals (中级出版专业技术人员职业资格考试) Exam

50 years from the date of the work's creation, regardless of the author's lifespan The lifetime of the author plus 50 years after the author's death, expiring on December 31 of the 50th year The lifetime of the author plus 70 years after the author's death, expiring on December 31 of the 70th year 20 years from the date of first publication, renewable once for an additional 20 years