The tool is free and open source. However, if you use it commercially (ie to make money in some way) you should make a donation to keep the project alive!

 
  • 这个工具是免费的,也是开源的。但是如果你在商业上使用它(比如从某些渠道获利),为了它能继续下去你应当对其作出贡献。
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