A device for protection against a reading not authorized of words of the program has to memorize in a memory, and memory unit comprising the said memory

摘要

The read word authorized program stored in a memory of a system for the treatment of clinical is thwarted by the supply to the reader, not permitting disturbing data from a source of clinical and in place of words of the program originating from the specification. In order to determine if the memory is read by a reader not allows or by the unit for the treatment of clinical of the system for the treatment of the program, it is used for the sequence in which the unit for the treatment of clinical reads the words in the memory programme. The order of succession, in which the unit for the treatment of clinical bed, the program in the specification differs to that in which the words are inscribed in the memory programme. Each word of a program stored in the memory is -added a microsecond, which comprises an indication of a word of the program to be extracted by the unit for the treatment of clinical. On the basis of this prior application, is present if the memory is read in order to determine by the unit for the treatment of clinical and therefore for the treatment of the program, or by a reader, which permits not know the order determine by the unit for the treatment of clinical.