Data access control method for controlling access to data stored in a database uses a data control matrix with alphanumeric key data that references useful data, with a hierarchical structure being used

摘要

Method for controlling access to data stored in a database uses an alphanumeric key data control matrix for referencing and accessing the actual useful data. A master row of the matrix is used reference the start character of the key data. If more than one key data item is stored in the matrix with the same start character, a reference is made to sub-row and so on.