Failing to defend trademarks for such similarity named and closely related products has extremely high risks.

“Xenon” is a pre-existing word. Intel’s not going to lose protection on “Xeon” for IBM using “Xenon” as an internal codename for their own CPU.

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		Pre-existing word like “Word” “Excel” “Apple” etc. We know about “Xenon” because they used the internal name outside the company. There’s zero difference between an unofficial and official branding when you’re using it in press releases.