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In the late 90s, other groups published their own definitions which describe an almost identical set of software. The most notable are Debian Free Software Guidelines published in 1997, and the Open Source Definition, published in 1998. The BSD-based operating systems, such as [[FreeBSD]], [[OpenBSD]], and [[NetBSD]], do not have their own formal definitions of free software. Users of these systems generally find the same set of software to be acceptable, but sometimes see copyleft as restrictive. They generally advocate [[permissive free software licenses]], which allow others to make software based on their source code, and then release the modified result as proprietary software. Their view is that this permissive approach is more free. The Kerberos (protocol), X.org, and Apache License software licenses are substantially similar in intent and implementation. All of these software packages originated in academic institutions interested in wide technology transfer University of California, MIT, and University of Illinois at Urbana-Champaign. == Examples of free software ==

Free software (view source)