I haven't been able to find any evidence that Mojang owns a trademark on "Bukkit", or even that such a trademark exists. They apparently don't own the domain na

I haven't been able to find any evidence that Mojang owns a trademark on "Bukkit", or even that such a trademark exists. They apparently don't own the domain name or the hosting accounts. And they don't own the entirety of the source code. Mojang is definitely claiming they "acquired" some kind of rights to Bukkit, but I can't find any description of what those rights are -- and, for a community project, I don't understand what they could possibly own that isn't public knowledge. You can't own secret trademarks.