https://apertus.org/ exists since 15 years, interesting choice of name.
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>> "The "o" stands for "open", "openness", "open source" and is placed where a "TM" symbol (indicating patents, trademarks, protection) would normally reside. Instead openness is the apertus° trademark."
It's also a completely different kind of thing so trademark probably wouldn't come into it even if they had one.