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Not how the law works. I’m not certain Perplexity has trademarked their name but the question of whether it’s an information theory term or not wouldn’t prevent them from doing so, nor would it prevent them from defending that trademark.

Engineer-y people trying to interpret law has to be one of the most reliably silly things on HN.

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Have you ever tried to trademark a random noun?

No but lots of other people have: https://tmsearch.uspto.gov/search/search-results

Feel free to release a computer named Apple to prove me wrong.

Alright, read up on domains, then try arguing that 'perplexity' as company and noun are in different spaces! I grant you that if they were, the company could trademark that noun. But it seems clear that Perplexity named itself after the noun and by so doing gave up the option of trademarking its company name.

> Engineer-y people trying to interpret law

It must be out of how perplexing apparent hiatus between legitimacy and positive law can be.

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