著作権法30年改正説明
https://www.nii.ac.jp/news/upload/20200417-1_Kishimoto.pdf?fbclid=IwAR14WCfk4_jJQr4FjkQj67ZaN_yOCpMoABNj75tYlaKHJSswENeNkaqQtwg
https://www.nii.ac.jp/news/upload/20200417-1_Kishimoto.pdf?fbclid=IwAR14WCfk4_jJQr4FjkQj67ZaN_yOCpMoABNj75tYlaKHJSswENeNkaqQtwg