警告：该作品在美国可能仍受版权保护，因此不可被上传至服务器位于美国境内的网站（含维基媒体基金会旗下项目）。
ATTENTION: This work may still be copyrighted in the United States. Therefore, it should not be uploaded to the website whose server is located in the United States, including Wikimedia projects.
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出于以下原因之一，本作品在中国处于公有领域，但在中国以外（尤其美国）仍受版权保护：
- 对于1978年之前发表的作品，美国版权法通常保护该作品至首次发表的第95年后。但是，中国版权法通常保护至作者逝世的第50年后，或作品首次发表后的第50年后。美国不遵守版权的“最短期限原则”。
- 根据美国《乌拉圭回合协议法案》（108 Stat. 4809），因本作品的美国版权截至乌拉圭回合谈判协议生效之日（“回溯日”）仍未届满，故美国受版权法继续保护该作品至其首次发表第95年后（少数情形除外）。对于来自中国、中国香港、中国澳门等大多数关税区的作品，回溯日为1996年1月1日；对于来自中国台北的作品，回溯日则为2002年1月1日；对于来自其他关税区的作品，其回溯日请查询美国版权署第38A号传单。
This work is currently in the public domain in China. But for one of the following reasons, this work may still be copyrighted outside China (especially in the United States):
- For works published before 1978, U.S. copyright typically lasts for 95 years from the year of first publication. However, copyright in China lasts the life of the work's creator plus 50 years, or 50 years from the year of first publication. The U.S. does not honor the "rule of the shorter term."
- Per the Uruguay Round Agreements Act (URAA) (108 Stat. 4809), this work is still copyrighted in China on the so-called "date of restoration," hence the copyright of this work in the U.S. has been restored and now lasts for 95 years from its first publication (with few exceptions). For works from most customs territories (including China; Hong Kong, China; and Macau, China), the date of restoration was January 1st, 1996. For works from Chinese Taipei, the date of restoration was January 1st, 2002. For other customs territories, please refer to Circular 38A of the United States Copyright Office for dates of restoration.
本页面所展示内容由网站用户上传并提供，求闻百科不为本页面的内容提供任何保证、担保或承担任何责任。只要本文件在中国处于公有领域，就可以用于求闻百科；但是，在中国以外（尤其美国）以任何目的使用本文件均可能构成侵犯著作权。在维基共享资源，上传此类文件通常需要同时提供该作品在起源国和美国同时处于公有领域的理由，因此这类文件通常不能上传至维基共享资源。
Contents on this page are uploaded and supplied by users of this website. Qiuwen Baike does not guarantee the validity of any information on this page. Certain works could be uploaded to Qiuwen Baike as long as they fell into the public domain in China, even if using them in any form outside China (especially in the U.S.) may constitute copyright violations. For uploads to Wikimedia Commons, since it is typically required to prove this work has fallen into the public domain in both the country of its origin and the U.S., works of this sort are typically not allowed on Wikimedia Commons.
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