Am I a copyright holder? How do I know?
我是版权所有者吗？怎样才能知道？
If you are unsure whether you hold rights to a particular work, please consult an attorney or another adviser as Twitter cannot provide legal advice. There are plenty of resources to learn more about copyright law including http://copyright.gov and http://www.eff.org/issues/bloggers/legal/liability/IP, just to name a few.
如果你不确定自己是否拥有某项作品的权利，请咨询律师或其他顾问，因为 Twitter 无法提供法律建议。你可以通过很多资源来了解更多关于版权法的信息，包括 http://copyright.gov、https://lumendatabase.org/ 和 http://www.eff.org/issues/bloggers/legal/liability/IP 等不一而足。