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+Asbestos is an operating system developed at MIT, Stanford
+and UCLA to explore information flow control policies.  The motivation
+behind Asbestos is that typical access control systems are concerned
+with the release of information, however, once that information is
+released, the [[principal]] that released that information has no way to
+control it.  The problem is that a program might want to make use of
+a service another program provides but not want to release the
+information to it.  To work around this, the OS provides the ability
+to taint data.  The taint is automatically applied to any derived
+information.  To propagate information outside of the machine, the
+releaser must first untaint the information.  This can only be done
+with the original principal's authorization.
+
+Asbestos is described in Efstathopoulos et al.'s 2005 paper [Labels and
+Event Processes in the Asbestos Operating System](http://pdos.csail.mit.edu/papers/asbestos-sosp05.pdf).