Primary Classification:
  H. Information Systems
  H.2 DATABASE MANAGEMENT
      H.2.0 General
          Subjects: Security, integrity, and protection**

Additional Classification:
  F. Theory of Computation
  F.2 ANALYSIS OF ALGORITHMS AND PROBLEM COMPLEXITY
      F.2.2 Nonnumerical Algorithms and Problems
          Subjects: Sorting and searching

  H. Information Systems
  H.2 DATABASE MANAGEMENT
      H.2.4 Systems
          Subjects: Query processing

General Terms:
Management, Security