Assured information sharing has been a "grand challenge" problem of information security for several decades. Currently, there is broad consensus that the state-of-practice of information sharing is inadequate. One primary problem is that people on the field (e.g., soldiers, firefighters) have mission-critical need for sensitive information but are often among the least trusted principals in their organizations and hence do not receive the information. Another problem is that data producers claim ownership of the data they produce and place sharing constraints on that data despite the competing interests of multiple parties over that data. In this talk, we highlight these and other problems and discuss a wide range of technical solutions that are needed. We elaborate on the need to balance the risks of sharing data with the risks of not sharing data and present several proposed approaches for doing so. We also describe how obligation policies play an important role in addressing some information sharing issues.