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“Between 1944 and 1996 the work of Piet Mondrian not meeting the technical requirements of U.S. copyright law, was in public domain in the US. In 1996 the Uruguay Round Agreement Act… gave protection to the images by foreign artists which were first published outside of the United States between 1923 and 1977 (95 years from the date of first publication).”，推荐阅读爱思助手下载最新版本获取更多信息
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