Policy on commercial use of the Druplicon?

I need a logo for my Drupal development business, and I'd like to design something that incorporates an image based on the Druplicon. Before I go ahead I need to find out what the policy is on this type of use.

I've queried the Drupal Association about this, and I expect them to give me the authoritative answer, but I don't know if I will get it quickly enough. Hence, I'm also asking here.

I have found a few forum topics about the status of the Druplicon, but they just conclude that it is covered by the GPL. That doesn't answer the question — this is a trademark issue, not a copyright issue, and the GPL says nothing about that.