Enlarge / Star Citizen's developers are flying into their own legal asteroid field, courtesy of Crytek. Star Citizen's lengthy and heavily crowd-funded development has been marked by numerous changes to the project's direction and scope, including a move from Crytek's CryEngine to Amazon's Lumberyard in late 2016. That change is now the focus of a lawsuit from Crytek, which accuses Star Citizen developers Roberts Space Industries (RSI) and Cloud Imperium Games (CIG) of copyright infringement and breach of contract. The complaint, filed in the US District Court for Central California, lays out how RSI agreed to work exclusively with CryEngine in a 2012 agreement, an agreement it says was broken when RSI moved to Amazon's Lumberyard engine in late 2016. In a blog post following that transition, RSI's Chris Roberts explained that Lumberyard was essentially a more promising fork of an earlier CryEngine build that fit better as a base for "StarEngine," his name for the "heavily modified" version of CryEngine the developers were then using.