Abstract: The main disclosure of the present invention is a method of producing a decrypting apparatus that includes a cryptographic device and a decryption key. Using the production method, the decryption key is confidentially acquired under a security-controlled condition, and conversion information is generated, the conversion information including encrypted decryption key which has been obtained by encrypting the acquired decryption key using an encryption method. Then, the conversion information is written in a nonvolatile memory which is to be incorporated in the decryption apparatus, and the decryption apparatus is assembled to include the cryptographic device in which a first circuit and a second circuit have been integrated, the first circuit decrypting the conversion information, and the second circuit performing decryption using the decryption key.

Abstract: A decryption unit decrypts encrypted content to generate content. An instruction execution unit outputs a transfer destination address showing a position in a content output unit to an address detection unit. The address detection unit judges whether the transfer destination address matches a pre-stored permitted address, and outputs the generated content only when the transfer destination address and the permitted address match, to the position in the content output unit shown by the transfer destination address. The content output address receives the content and outputs the received content to an external device.

Abstract: A decryption device includes: an internal-key storage section for storing an internal-key; a content-key storage section for storing a content-key; a determination section for determining whether or not a value of the content-key storage section in its initial state and a current value of the content-key storage section are different; and an operation section, the operation section including a first decrypting section which, when an encrypted content-key is input to the operation section, decrypts the encrypted content-key using the internal-key so as to obtain a content-key and stores the content-key in the content-key storage section, and a second decrypting section which, when an encrypted content is input to the operation section and the determination section determines that the value of the content-key storage section in its initial state and the current value of the content-key storage section are different, decrypts the encrypted content using the current value of the content-key storage section as a c

Abstract: A bus bridge apparatus that connects two system buses independent of each other to which a bus arbiter operating independently and located outside of the apparatus, has a function for serving as a master and a slave of the system buses, a base address holding means, and a bus address generating means.

Abstract: A multimedia server has: a server section having a transfer-request accepting section for accepting a transfer request for data, a processor connected to the transfer-request accepting section, for discriminating the kind of the data and for converting the transfer request to a transfer instruction, and a bus interface; a storage device for storing data; an accelerator section having a storage-device interface for interfacing to the storage device and for retrieving data therefrom, a data transfer section for transferring the data, a processor for processing the transfer instruction issued from the server section, and for issuing a transfer instruction to have the data transferred from the storage-device interface to the data transfer section and then issuing a transfer instruction to the data transfer section to transfer the data to a requesting destination, and a bus interface; and a bus for connecting the server section with the accelerator section.