A community policy is currently being defined as guidelines for eZ community sites. Furthermore, we are in the process of reviewing our trademark policy to make it a publicly available document, because it is related to the community policy.
I can't provide a date of publishing to you right now, but will let you know ASAP. This task is definitely high priority, because it serves as a basis for our growing community.
Until then, I suggest to contact eZ systems to find a temporary gentlemen agreement - as we have done with the community sites listed on Planet eZ publish.