Hey Bukkit team, I've been working with a few folks on the development of some internal plugins that we'd like to use in a commercial setting. Looking at Bukkit/Craftbukkit licensing, however, we're having trouble moving forward. It is our understanding that: Minecraft is closed-source proprietary software covered by the Minecraft Terms of Service. Craftbukkit is a culmination of reverse-engineered proprietary Minecraft code and community contributions. Oddly, this is labeled GPL v3 and there is no documentation to suggest Mojang AB has made an exception to their ToS for the Bukkit community. Bukkit is a wrapper/set of APIs for plugin developers to interface with and include with their own derivations (e.g. Spout). This is licensed LGPL. There are a few concerns here: Should we continue commercial use, we open ourselves up to liability re: the commercial use of Minecraft proprietary code. We would love if Mojang AB issued an authoritative statement on this, or perhaps offered an exclusion to the Bukkit community. Also, we run the risk of violating Craftbukkit's GPL license... although it isn't clear if this license is valid, as LGPL Bukkit-developed software ultimately runs as a component of a single GPL Craftbukkit program, creating a derivative work and therefore incompatible licensing environment. We saw a similar question pop up a year ago, but there hasn't been traction since. We can take this offline if needed, but would love to get this resolved for both us and the Bukkit community.