On Monday, 1 February 2016 at 20:01:11 UTC, Chris Wright wrote:
What I would actually expect, instead of a C&D letter, is a set of guidelines for using the D logo and other trademarked material. That's pretty standard for open source projects. And if those guidelines forbad using the D logo for a documentation mirror, that would be a problem.
The last time this was discussed it came up that the creator of the logo has not transferred the rights, so you would have to ask the creator of the logo for usage that goes beyond the website.
Unless this has changed there is no way for "D Foundation" to register the design as a trademark. And the letter "D" itself cannot be used as a trademark, so if you want to trademark a "D" logo it has to be very specific.