Open Knowledge and the Open Definition Advisory Council have announced the released of version 2.0 of the Open Definition, a set of principles that define openness as it relates to data and content. Many world governments have been launching open data initiatives across the globe, but doing so opens a new set of risks due to incompatibility and fragmentation of open licenses. This revision of the open definition includes a rewrite of the core principles to clarify key aspects, a clearer separation of an open license from an open work, and guidelines for how data should be made accessible.