| 摘要 |
Programs which can be run on data-processing equipment can be illegally copied if all data required for the program to run can be copied. This can be prevented if key information which cannot be overwritten is stored on an exchangeable storage medium (a) which can be repeatedly overwritten, e.g. a diskette, magnetic type, magneto-optical disk, and read out by a reading device (c, d) in the mechanism, determining that a program uses this key information while running and its further running is prevented if this key information is not accessible to the program. This permits true multi-tasking, i.e. the virtually simultaneous running of several programs. |
