二者都理解错了，因为GNU GPL有开源许可证的资格，而多数开源的许可证也有自由软件许可证的资格。
These are both mistaken, since the GNU GPL qualifies as an open source license and most of the open source licenses qualify as free software licenses.
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.
月 29 日，自由软件基金会抛出了其所谓通用公共许可证 （GPL） 的第 3 版。
On June 29th, the Free Software Foundation unveiled version 3 of the GNU General Public license (GPL).
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