Changes

Over time improvements to Unix were developed by others under license from AT&T.  They used the AT&T source code but generally did not use its Unix trademark.  Important examples from the 1980s include [[BSD]], [[SunOS]] and [[Xenix]].

Over time improvements to Unix were developed by others under license from AT&T.  They used the AT&T source code but generally did not use its Unix trademark.  Important examples from the 1980s include [[BSD]], [[SunOS]] and [[Xenix]].

In the 1990s AT&T sold Unix to [[Novell]].  Novell transferred the trademark to [[X/Open]] in 1994<ref>http://www.unix.org/questions_answers.html#</ref>, which in turn licensed it for use on any operating system which met the [[Single Unix Specification]]<ref>http://www.unix.org/questions_answers.html#7</ref>, separating the name "Unix" from the original Unix source code.  X/Open is now part of [[The Open Group]], having merged with [[The Open Software Foundation]].

In the 1990s AT&T sold Unix to [[Novell]].  Novell transferred the trademark to [[X/Open]] in 1994,<ref>http://www.unix.org/questions_answers.html#</ref> which in turn licensed it for use on any operating system which met the [[Single Unix Specification]],<ref>http://www.unix.org/questions_answers.html#7</ref> separating the name "Unix" from the original Unix source code.  X/Open is now part of [[The Open Group]], having merged with [[The Open Software Foundation]].

Novell later sold its business of licensing and supporting [[System V]] Unix (the direct descendant of the original AT&T Unix) to [[The Santa Cruz Operation]], commonly called "SCO"; exactly which rights were sold, and whether the copyright itself was sold, is part of the dispute in the [[SCO v. Novell]] lawsuit.  In 2000, [[Caldera Systems]] purchased the server software division of SCO, which then changed its name to [[Tarantella]].  In 2002, Caldera changed its name to [[The SCO Group]].

Novell later sold its business of licensing and supporting [[System V]] Unix (the direct descendant of the original AT&T Unix) to [[The Santa Cruz Operation]], commonly called "SCO"; exactly which rights were sold, and whether the copyright itself was sold, is part of the dispute in the [[SCO v. Novell]] lawsuit.  In 2000, [[Caldera Systems]] purchased the server software division of SCO, which then changed its name to [[Tarantella]].  In 2002, Caldera changed its name to [[The SCO Group]].

==See Also==

==See also==

* [[Tails (operating system)|Tails Anonymous Secure Operating System]]

* [[Tails (operating system)|Tails Anonymous Secure Operating System]]

* [[Linux]]

* [[Linux]]

[[Category:Free Software]]

[[Category:Free Software]]

==External Links==

==External links==

*[http://www.kernel.org/ The Linux Kernel Archives]

*[http://www.kernel.org/ The Linux Kernel Archives]

*[http://www.linux-foundation.org/en/Main_Page The Linux Foundation]

*[http://www.linux-foundation.org/en/Main_Page The Linux Foundation]

*[http://www.faqs.org/docs/artu/ch01s06.html#id2877917 Basics of the Unix Philosophy]

*[http://www.faqs.org/docs/artu/ch01s06.html#id2877917 Basics of the Unix Philosophy]