Jelena Mamčenko Operating Systems Lecture Notes on Operating Systems 69with UNIX System V Release 4. Novell tried to use this to battle against Windows NT, but their core markets suffered considerably. In 1993, Novell decided to transfer the UNIX® trademark and certification rights to the X/Open Consortium.In 1996, X/Open merged with OSF, creating the Open Group. Various standards by the Open Group now define what is and what is not a "UNIX" operating system, notably the post-1998 Single UNIX Specification. In 1995, the business of administering and supporting the existing UNIX licenses, plus rights to further develop the System V code base, were sold by Novell to the Santa Cruz Operation. Whether Novell also sold the copyrights is currently the subject of litigation (see below). In 1997, Apple Computer sought out a new foundation for its Macintosh operating system and chose NEXTSTEP, an operating system developed by NeXT. The core operating system was renamed Darwin after Apple acquired it. It was based on the BSD family and the Mach kernel. The
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