A discussion of copyleft licenses focuses on the early history of the GPL, which Kelty identifies as an Ur-license that nearly every other free software license is descended from.
有关copyleft许可证的讨论主要是介绍GPL的早期历史，GPL是Kelty确认的Ur许可证，几乎所有其他自由软件许可证都源于它。
A discussion of copyleft licenses focuses on the early history of the GPL, which Kelty identifies as an Ur-license that nearly every other free software license is descended from.
有关copyleft许可证的讨论主要是介绍GPL的早期历史，GPL是Kelty确认的Ur许可证，几乎所有其他自由软件许可证都源于它。
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