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Hartson, H. Rex – Journal of the American Society for Information Science, 1974
A model which relates the access control and indexing functions. The model is based on concept protection which allows a practically unbounded number of levels (subsets) of protection without requiring a fixed hierarchy among the levels. This protection is offered independently for each of the user operations allowed. (Author)
Descriptors: Automatic Indexing, Computer Science, Confidentiality, Data Processing