Abstract: A content playback apparatus includes an SKF selecting unit that selects one segment key file from plural segment key files recorded in a DVD media at a time of playback of a content of the sequence key section, a data selecting unit that selects each content corresponding to a segment number of each key entry registered in the selected segment key file, a moving picture data decrypting unit that decrypts the selected moving picture data by a segment key corresponding to the segment number, and a decoder that plays back the decrypted moving picture data.

Abstract: According to one embodiment, video image and audio signals are transmitted to a plurality of electronic devices each having at least one of a video image display function and an audio reproducing function. Information indicating the fact that at least one of a video image and audio has been set in a mute state is acquired from each of the electronic devices. Based on the information, a processing operation is applied to the video image and audio signals supplied to each of the electronic devices.

Abstract: According to one embodiment, since key information is written after a drive unit and host unit are assembled into a player, it is not necessary to manage, in the assembled player, the correspondence in secret key information between the drive unit and host unit. Further, in the player, even if, for example, the drive unit must be exchanged for another, encrypted key data can be shared simply by writing another key data item.

Abstract: Many different key data items can be prepared even if the memory capacity of a key data setting unit incorporated in a content decryption unit. Partial content data items to be successively read are stored in an accumulation medium, encrypted with corresponding key data items. There are provided a key data table which stores the key data items, a read processing section for reading, from the accumulation medium, the partial content data items, a decryption unit for decrypting the read partial content data items, and a set-key selection section for reading, from the key data table, a key data item for decrypting a partial content data item to be decrypted, and a key data item for decrypting a partial content data item to be processed next at least, the set-key selection section also setting the read key data items in the decryption unit.

Abstract: In a media key generation apparatus which generates the media key of an AACS-compatible medium according to the present invention, a search unit searches encryption values recorded on the medium for an encryption value associated with a coordinate derived from a coordinate associated with one of a plurality of device keys held in a system. A calculation unit calculates the device key value obtained by encrypting the found encryption value, from the device key associated with the coordinate serving as a derivation source on the basis of the derivation relationship between the coordinate associated with the found encryption value and the coordinate serving as the derivation source. A write unit writes, in a nonvolatile storage medium, the calculated device key value, block identification information, and storage position information of the found encryption value in the block.

Abstract: According to one embodiment, disconnection/connection of external devices networked as connected devices is automatically detected, and connection environment of the external devices is grasped, so that various functions can be controlled. A disconnection/connection detecting unit detects whether an external device is connected to or disconnected. An authentication unit conducts a mutual authentication when the external device is connected. When the external device is disconnected while the recording medium is being reproduced, a positional information processing unit causes positional information concerning a position being reproduced to be stored. When the external device reconnected again, a reproduction start control unit starts a reproduction of the recording medium according to the positional information.

Abstract: A repeater comprises an EDID memory to store a control data and a memory control unit. The memory control unit is configured to make access to the EDID memory to read the control data therefrom, store the read control data into the EDID memory and, when access is made to the EDID memory by the set-top box, transfer the control data stored in the EDID memory to the set-top box. In this case, the memory control unit outputs an inhibiting signal to a set-top box to inhibit it from making access to the EDID memory until the completion of an operation of storing the control data from the EDID memory in the set-top box into the EDID memory in the repeater.

Abstract: A repeater comprises an EDID memory to store a control data and a memory control unit. The memory control unit is configured to make access to the EDID memory to read the control data therefrom, store the read control data into the EDID memory and, when access is made to the EDID memory by the set-top box, transfer the control data stored in the EDID memory to the set-top box. In this case, the memory control unit outputs an inhibiting signal to a set-top box to inhibit it from making access to the EDID memory until the completion of an operation of storing the control data from the EDID memory in the set-top box into the EDID memory in the repeater.

Abstract: A computer includes a unit which reads out authentication data recorded on a portable recording medium by another device, a recording unit which records the authentication data read out by the unit, and an authentication unit which performs mutual authentication processing between the authentication unit and the another device by using the authentication data recorded in the recording unit.

Abstract: A repeater comprises an EDID memory to store a control data and a memory control unit. The memory control unit is configured to make access to the EDID memory to read the control data therefrom, store the read control data into the EDID memory and, when access is made to the EDID memory by the set-top box, transfer the control data stored in the EDID memory to the set-top box. In this case, the memory control unit outputs an inhibiting signal to a set-top box to inhibit it from making access to the EDID memory until the completion of an operation of storing the control data from the EDID memory in the set-top box into the EDID memory in the repeater.

Abstract: Noise reduction apparatus comprising, encoder, having a memory for storing picture data of a different picture that was formed from a current picture and a reference picture and a motion detector for detecting the motion between the current picture and the reference picture on block by block basis, for encoding the current picture data or for predictive-encoding the inter-pixel difference between blocks of the current picture data and the reference picture data blocked based on the results of the motion detection, a correlation calculator for calculating at least an additional correlation between a first correlation and a second correlation. The first correlation is between a block-of-interest in the current picture used for the predictive encoding and the reference picture block.

Abstract: A video signal processing apparatus capable of improving a signal to noise ratio of a video signal by providing for a first luminance/chrominance separation circuit for still pictures and a second luminance/chrominance separation circuit for moving pictures. Color disturbances on the screen can be avoided by switching between a parallel configuration and a serial configuration of the first and second separation circuits without generating differences in signal delay times.

Abstract: A Y/C separating apparatus includes a first separator for separating a stationary C component which has a demodulator for demodulating a color difference signal from the composite video signal with a color subcarrier signal, a detector for detecting a frame difference signal between two adjacent frames of the color difference signal and a modulator for modulating the frame difference signal with the color subcarrier signal so as to reproduce the stationary C component.

Abstract: A digital filter having a characteristic expressed by a rational function executes a signal processing in a predetermined sequence in accordance with a pre-emphasis mode or de-emphasis mode. A first digital filter has a characteristic expressed by a denominator polynomial of the rational function and processes an input signal according to this characteristic to produce a first process signal. A second digital filter has a characteristic expressed by a numerator polynomial of the rational function and processes an input signal according to this characteristic to produce a second process signal. A mode selector selects one of the pre-emphasis and de-emphasis modes. A first switch supplies the input signal to the first digital filter in accordance with the pre-emphasis mode and supplies the second process signal from the second digital filter to the first digital filter in accordance with the de-emphasis mode.

Abstract: Digital servo apparatus includes a counter adapted to count inputted reference clock pulses to display time data. The output of the counter is latched by a first tacho pulse (controlled signal) to a first latch circuit and the contents of the first latch circuit is transferred by a second tacho pulse to the second latch circuit and the present count data of the counter is latched to the first latch circuit. A discrimination circuit is adapted to discriminate whether or not a control signal is within a predetermined control amount, based on time difference data latched to the first and second latch circuits, and deliver an output signal corresponding to a predetermined control amount based on the result of discrimination.