Under the international Berne Convention for the Protection of Literary and Artistic Works of 1886, the signatory countries are required to provide copyright protection for a minimum term of the life of the author plus fifty years.
依據1886年的國際伯尔尼保护文学和艺术作品公约（簡稱伯恩公約），簽署公約的國家被要求提供對作者至少死後加上五十年的著作權保護。