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Does an operating system have to be derived from AT&T/SCO code to meet the Single UNIX Specification?

April 26, 2017code derived meet operating system SCO specification Unix

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Does an operating system have to be derived from AT&T/SCO code to meet the Single UNIX Specification?

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No. As the owner of the UNIX trademark, The Open Group has separated the UNIX trademark from any actual code stream itself, thus allowing multiple implementations. Since the introduction of the Single UNIX Specification, there has been a single, open, consensus specification that defines the requirements for a conformant UNIX system.