The term of protection of a work's copyright was usually 20 years, but the copyright owner could extend the term of protection. The specific extension of the term of protection was the legal practice of various countries. For example, the copyright protection period in China was 120 years for the author's lifetime and 50 years after his death, while the copyright protection period in the United States was 175 years for the author's lifetime and 40 years after his death. During the extended period, the copyright owners still retained the copyright of their works unless they voluntarily gave up the rights. If the copyright owner does not give up his rights, his personal rights and property rights (such as the right to profit, adaptation rights, translation rights, etc.) are protected by the copyright law after the work is published.