Abstract: A reproduction apparatus includes a read section for reading a first data unit from a recording medium having the first data unit recorded thereon; a communication section for receiving a second data unit in accordance with a communication condition with a server; a synthesis section for, when the communication section cannot receive the second data unit in accordance with the communication condition, outputting the first data unit as a first output data unit, and when the communication section can receive the second data unit in accordance with the communication condition, synthesizing the first data unit and the second data unit so as to generate a synthesis data unit and outputting the synthesis data unit as a second output data unit; and a reproduction section for reproducing the first output data unit and the second output data unit.

Abstract: Synthetic key data hard to restore mutual authentication key data is generated by using the mutual authentication key data related to processing permitted to a user card 73 among processing relating SAM unit 9a and 9b. Then, the synthetic key data and key designation key data designating mutual authentication key data used for generating the synthetic data is written in the user card 73.

Abstract: The present invention provides an audio decoding apparatus which can decode and reproduce a plurality of compressed audio streams simultaneously without sound interruption, even when the number of samples per frame is different. The audio decoding apparatus includes: a first and second audio decoder which decode two inputted compressed audio streams, and output audio data; a first and second intermediate buffer which temporarily hold the outputted audio data; a first and second audio output unit which convert the audio data into audio signals and output such audio signals; an output control unit which reads the audio data from the first and second intermediate buffer, and transmits the audio data to the first and second audio output unit. The output control unit repeats the reading and transmission of either the same number of samples of audio data or the number of samples of audio data for the same amount of transmission time, from the first and second intermediate buffer to the first and second output unit.

Abstract: A management device 20 outputs key designation data read from a card to a SAM unit 9a. The SAM unit 9a uses mutual authentication key data designated by key designation data to generate synthetic key data. The management device 20 and the SAM unit 9a use the synthetic key data for authentication. When the SAM unit 9a confirms the legitimacy of the management device 20, it executes processing related to one or more mutual authentication key data used for generating the synthetic key data.

Abstract: An encryption apparatus capable of effectively preventing encryption data from being illegally generated is provided. Based on apparatus identification data of an IC, which is input from a computer, a secure application module (SAM) selects an encryption method from among a plurality of different encryption methods. Based on the code of the IC, the SAM selects plaintext data to be encrypted from among the plurality of different pieces of plaintext data. The SAM outputs encryption data such that the selected plaintext data is encrypted by the selected encryption method.

Abstract: A data processing apparatus is provided which is capable of improving the responsiveness of communication in which only a maximum of one access request source has write authorization and the other access requests do not have write authorization when communication is performed with a plurality of access request sources. A management apparatus transmits, to a secure application module (SAM), a strong connection request requesting the obtainment of write authorization into the SAM. When it is determined that the strong connection has not already been assigned to the other management apparatuses, the SAM assigns the strong connection to the management apparatus in a state in which a weak connection having read authorization with the management apparatuses is maintained.

Abstract: A pass-code identification device includes a communication unit for communicating with an external apparatus, a data-holding unit for holding data, a pass-code-holding unit for holding a pass-code, a pass-code comparison unit for comparing an input pass-code received through the communication unit with the pass-code held by the pass-code holding unit, and a flow control unit for controlling a result of comparison of the pass-codes in accordance with a condition for comparing the pass-codes. The condition determines whether or not it is necessary to judge pass-codes. The condition also determines whether or not a pass-code is required to change a pass-code from valid status to invalid status and vice versa.

Abstract: This invention relates to a signal transmission apparatus and a signal transmission method both for transmitting a plurality of pieces of encoded audio information having a plurality of sampling frequencies of F or 1/N×F, which are encoded by the same encoding method, via a digital interface to a signal reception apparatus.

Abstract: An information processing method has a mechanism wherein mutual verification is performed between tasks and a computer operating system at the time of activating tasks, thereby judging the validity of tasks. The operating system evaluates a key which the task holds at the time of requesting service of the operating system, and permits execution of services only in the event that the operating system itself has the same key. A mail transmitting task specifies a mail ID and address to a mail body, management information is written by the operating system to a secure memory queue list based on the security level of the mail transmitting task and the security level of a transmitting function, and contents wherein mail transmission contents are enciphered with the mail ID, address value of management information, and address value of the mail body, as a key, are written to a buffer.

Abstract: An encoding device includes an encoding section for generating hit streams having a variable frame length from an input audio signal, a maximum frame length of the bit streams being fixed; a storage section for storing the bit streams generated by the encoding section; and a transfer section for transferring the bit streams at a prescribed transfer rate. The storage section includes a buffer having a capacity corresponding to at least a value which is obtained by subtracting an amount of the bit streams transferable in one frame time period at a minimum possible transfer rate from a value of twice the maximum frame length.

Abstract: An information processing method has a mechanism wherein mutual verification is performed between tasks and a computer operating system at the time of activating tasks, thereby judging the validity of tasks. The operating system evaluates a key which the task holds at the time of requesting service of the operating system, and permits execution of services only in the event that the operating system itself has the same key. A mail transmitting task specifies a mail ID and address to a mail body, management information is written by the operating system to a secure memory queue list based on the security level of the mail transmitting task and the security level of a transmitting function, and contents wherein mail transmission contents are enciphered with the mail ID, address value of management information, and address value of the mail body, as a key, are written to a buffer.

Abstract: According to the data amount and the nature of a video stream and an audio stream included in a program stream which is to be decoded, an audio and video processing apparatus performs processing while allocating higher priority to one or the other of the video and audio streams. Without any increase in circuit complexity or clock speed, this apparatus can reproduce streams in at least two formats, in which the ratios of the amounts of encoded signal data and of the amounts of calculation required for decoding for the video and the audio are very different.

Abstract: An information processing method has a mechanism wherein mutual verification is performed between tasks and a computer operating system at the time of activating tasks, thereby judging the validity of tasks. The operating system evaluates a key which the task holds at the time of requesting service of the operating system, and permits execution of services only in the event that the operating system itself has the same key. A mail transmitting task specifies a mail ID and address to a mail body, management information is written by the operating system to a secure memory queue list based on the security level of the mail transmitting task and the security level of a transmitting function, and contents wherein mail transmission contents are enciphered with the mail ID, address value of management information, and address value of the mail body, as a key, are written to a buffer.

Abstract: A data processing device, in a system performing authentication among a plurality of storage device (IC cards etc.), able to maintain security of authentication at other device even when secrecy of key data held by part of the devices is lost, wherein a key generation unit generates individual key data unique to an IC card based on identification data unique to the IC cards received from the ICs of the IC cards and a card processing unit performs mutual authentication with the IC based on the individual key data.

Abstract: An audio decoding apparatus is provided for receiving a bit stream on a block-by-block basis, decoding one block of the bit stream to form decoded audio data for a plurality of channels, and storing the decoded audio data for each of the plurality of channels in a memory device, thereby down-mixing the decoded audio data for each of the plurality of channels. The audio decoding apparatus includes an operation section for down-mixing the decoded audio data for each of the plurality of channels corresponding to a first block of the bit stream in the memory section while a second block of the bit stream is decoded.

Abstract: A data processing device able to keep a technique for generation of the key data in a key generating means secret from a developer of an authenticating means, wherein an authentication program has a description for calling up a function in a key generation program and entering identification data of service etc. input from an IC of an IC card as input parameters of the function and wherein a key generation program generates a key by using the identification data written at predetermined addresses as input parameters in accordance with the execution of a code on the basis of the authentication program.

Abstract: When transferring elements APE forming an application program between SAM units 9a and 9b, management data which specifies identification data of elements, presence of mutual authentication, mode of reference (usage), and a mutual authentication key of each element is prepared and the elements transferred between the SAM units A and 9b based on the management data.

Abstract: A pass-code identification device includes a communication unit for communicating with an external apparatus, a data-holding unit for holding data, a pass-code-holding unit for holding a pass-code, a pass-code comparison unit for comparing an input pass-code received through the communication unit with the pass-code held by the pass-code holding unit, and a flow control unit for controlling a result of comparison of the pass-codes in accordance with a condition for comparing the pass-codes. The condition determines whether or not it is necessary to judge pass-codes. The condition also determines whether or not a pass-code is required to change a pass-code from valid status to invalid status and vice versa.

Abstract: In accordance with a plurality of processing requests, a SAM chip generates IC card entity data including job execution order data showing an order of execution of a plurality of jobs forming processing in accordance with a processing request and status data showing a state of progress of execution of said plurality of jobs for each of said processing requests. Further, the SAM chip selects one entity data from said plurality of entity data, selects and executes the job to be executed next based on the status data and processing order data of said selected entity data, and updates the status data in accordance with execution of said job.

Abstract: A reproduction speed conversion apparatus includes an audio decoding section; an audio reproduction speed conversion section; a video reproduction speed conversion section; and a video decoding section. The video reproduction speed conversion section determines whether reproduction speed conversion corresponding to a requested level is possible or not. When the reproduction speed conversion is determined to be possible, the video reproduction speed conversion section performs reproduction speed conversion corresponding to the requested level. When the reproduction speed conversion corresponding to the requested level is determined to be impossible, the video reproduction speed conversion section performs reproduction speed conversion corresponding to a prescribed level lower than the requested level, and outputs a second reproduction speed signal representing the prescribed level to the audio reproduction speed conversion section.