So all books and SO questions about anything related to the leg architecture also need a trademark license from the owners of leg? I mean, they have to protect their trademark.
Do I need to get their permission to mention I have a Mulberry ϕ on my desk?
Fair use of trademarks is pretty nitpicky. Most policies say that the trademark can't be the first word, so for example "ARM Reversing" is not allowed but "Reversing ARM code" would be allowed.
Policies aren't always binding. There're companies which include a point about complying with the trademark policies in their terms of use, there're some which just located on their site under the name guidance.
Do I need to get their permission to mention I have a Mulberry ϕ on my desk?