In the early 1970s AT&T distributed early versions of Unix at no cost to government and academic researchers, but these versions did not come with permission to redistribute or to distribute modified versions, and were thus not free software in the modern meaning of the phrase.
在1970年代早期，AT&T 免费地向政府和学术研究人员分发早期版本的 UNIX，但并没有提供重新分发或分发修改后的版本的许可，因此并非现代意义上的自由软件。