[marcosdumay]

> there's a clear difference between a site critical of Ubuntu using their name in the domain and their logo in the header image versus a passing remark in documentation or code.

IANAL, but as far as I understand US law (it's crazy, but everybody needs to learn it nowadays), the first use is explicitly permitted, while a passing citation in documentation is a more nebulous issue.

[Flimm]

I'm very surprised by your statement. It would seem to me to be the opposite way round. Surely a passing a citation is fine, it's using someone's trademark in your branding (and a domain name and logo is arguably branding) that's the nebulous issue? Could you point out to me where I could learn about US law that would teach me this counter-intuitive reasoning?