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This model is concerned with situations in which a subject should be restricted from gaining particular privileges.
Lipner
Harrison-Ruzzo-Ullman
Clark-Wilson
Graham-Denning
Not in book where the other models are indicated. The Harrison-Ruzzo-Ullman model is very similar to the Graham-Denning model, and it is composed of a set of generic rights and a finite set of commands. It is also concerned with situations in which a subject should be restricted from gaining particular privileges. To do so, subjects are prevented from accessing programs or subroutines that can execute a particular command (to grant read access for example) where necessary.
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