UNIX trademark

[Arthur David Olson]

> 'The trademark UNIX must be clearly and legibly identified
> as a trademark of AT&T at least once in any article, advertisement
> or document...'

I failed to spot the trademarking in Scientific American software issue article
that dealt with UNIX.  Did I miss something?
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UNIX is an AT&T Bell Laboratories trademark.
And just what do we do if somebody trademarks Usenet?
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