You do not need a license to create MP3 files, since you're using original content, not someone else's.
You may need a license to use an MP3 encoding library, depending on which you are using. Some MP3 codecs are free so if you use one of those, you will most likely need no license at all.
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您不需要许可证来创建 MP3 文件，因为您使用的是原创内容，而不是其他人的内容。
您可能需要许可证才能使用 MP3 编码库，具体取决于您使用的编码库。有些 MP3 编解码器是免费的，因此如果您使用其中一种，很可能根本不需要许可证。
You do not need a license to create MP3 files, since you're using original content, not someone else's.
You may need a license to use an MP3 encoding library, depending on which you are using. Some MP3 codecs are free so if you use one of those, you will most likely need no license at all.