which then defined as the Three Freedoms of Free Software (Freedom Zero was added later). Published versions of FSF's Free Software Definition existed as early as 1986, having been published in the first edition of the (now defunct) GNU's Bulletin.

Debian Free Software Guidelines

The Debian Free Software Guidelines (DFSG) was first published together with the first version of the Debian Social Contract in July 1997. The primary author was Bruce Perens,

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