<blockquote>You cannot create "Foobar Enterprise 0MQ" in the way that Red Hat have created "RH Enterprise *Linux*".</blockquote>
I don't follow the logic of this. 'Linux' is trademarked too, just like '0MQ'. Wide usage is allowed due to a liberal policy and light application of the power trademark law provides.
0MQ could be the same if it wanted. It's not entirely due to trademark law per se. Now perhaps the point is that iMatix/PeterH aren't prepared to chnage the policy at all, but they seem pretty reasonable to me in the linked communications.