TEMPORAL DATA PROCESSING SECURITY SYSTEM

摘要

A first security program (Y) is initially installed in the long-term storage region (16) together with a second security program (Z). A date item (X) is also installed in another long-term storage region (15). The first security program (Y) tests whether the current date provided by a calendar (C) is the same as the installation date in item (X) and, only if true, creates a copy (X') in a region (11) of long-term storage. The copy (X') is arranged to not allow copying of itself. The security program (Y) finally deletes itself. The second security program (Z) requires absence of the program (Y) and presence of an accurate copy (X') in the region (11) before user access to the main contents of regions (15) and (16) is allowed.