DATA INVALIDATING DEVICE

摘要

PURPOSE: To provide a data invalidating device capable of improving user's convenience without deviating from the purpose allowing no duplicate of data. CONSTITUTION: This data invalidating device is provided with a receiving part 102 for receiving the data indicating that copying is not permitted, a recording part 107 dividing the received data into partial data and recording it, a reproducing part 110 for reproducing the recorded partial data sequentially, an invalidation judging part 111 judging that the partial data must be invalidated due to the expiration of recording term and the reproduction of the partial data, and a one after another invalidating part 113 for destroying at least the data required previously to utilize other data among the partial data to be invalidated one after another by substituting new data and arbitrary data.