ZeroMQ and Crossroads I/O: Forking over trademarks

This isn't the first case where a project has been split purely over trademarks with no difference in the copyright license, and with the ability for patches to flow freely between the projects. Debian Iceweasel is the same. Of course, Iceweasel simply tracks Firefox, and imports any changes; there's no actual independent development going on on the Iceweasel side. Still, I think it's an interesting precedent.