Similarly, the United States' revision of its Copyright Act in 1909 broadened copyright protection to music and further to all works of authorship.
类似地，美国 1909 年对Copyright Act的修订，将版权扩展到保护音乐以及所有原创作品。
Similarly, the United States' revision of its Copyright Act in 1909 broadened copyright protection to music and further to all works of authorship.
类似地，美国 1909 年对Copyright Act的修订，将版权扩展到保护音乐以及所有原创作品。
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