Abstract: A license issuance server capable of performing a function of securely preventing illegalities concerning the granting of licenses to individual machines. In response to an encryption key generation request for software, software encryption key generating means generates a software encryption key and a software decryption key for decrypting the software encrypted by using the software encryption key. In response to a license issue request including device identification information fixedly recorded on a recording medium in a processing device which is a target of permission to run the software, license issuing means encrypts the software decryption key by using the device identification information and outputs a software license including the encrypted software decryption key. Thus, the encrypted software can be decrypted only in the processing device in which the device identification information is fixedly recorded.

Abstract: A data processing device includes a cache memory, a load buffer primary (LBP) for storing 1-line instruction data including an instruction requested to be transmitted by an instruction processing unit and transmitted from a main storage or a secondary cache memory, and a load buffer secondary (LBS) for storing 1-line instruction data preceded by the above described 1-line data. With this configuration, the device may determine the validity of prefetched data in the LBP using lower order bits of the addresses of the data. If the data are determined to be valid, the data stored in the LBS are stored in the cache memory. A cache storage device, hierarchically provided between a central processing unit a n d a main storage device, includes a cache memory, a storage buffer, a write-in buffer and a cache storage control unit. The cache storage device fast writes storage data into a write-in buffer instead of directly into cache memory.