Abstract
Access control models generally distinguish between physical access control that mediates access to physical resources such as buildings, sections of buildings or individual rooms, and logical access control that mediates access to logical objects such as information stored in files or databases. All logical access control models make some, more or less implicit, assumptions about the physical access control model, e.g. that servers are locked in a room with restricted access. However, problems arise when a logical object gets a physical representation, e.g. when a file is displayed on a screen or printed, because the logical access control model has no way to ensure, or even to monitor, that the physical access control policies are being enforced.
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