Abstract: According to one embodiment, an optical disk apparatus is provided with a read section which reads data from an optical disk to output read information, a determination section which determines presence/absence of an error of the read information to output an error presence/absence signal, a transfer processing section which receives the error presence/absence signal and receives a hash request signal and transfers the hash request signal when the error presence/absence signal indicates the absence of an error, and does not transfer the hash request signal when the error presence/absence signal indicates the presence of an error, and a processing section which performs hash processing to the read information upon reception of the hash request signal.

Abstract: An audio data processor includes: a digital interface configured to transfer first audio data to an external apparatus through a one-way bus and transfers second audio data being in parallel with the first audio data regarding playback time to the external apparatus through an asynchronous two-way bus; and a controller configured to output a bit stream obtained by adding time information for specifying the playback time successively to the first audio data to the one-way bus, acquire an output request issued for each piece of the time information obtained successively from the bit stream from the external apparatus through the asynchronous two-way bus, and output a part of the second audio data corresponding to the time information of the output request through the asynchronous two-way bus.

Abstract: According to one embodiment, an audio data processing apparatus of this invention comprises a decryption unit which selects audio data to be reproduced under copyright protection, an HDMI unit which outputs the audio data selected by the decryption unit in the form of a bitstream to an AV amplifier connected via a dedicated cable, and a system control unit which acquires specification identification data from the AV amplifier before the bitstream output of the audio data and recognizes a watermark detection function of the AV amplifier on the basis of the specification identification data.

Abstract: According to one embodiment, an optical disk apparatus is provided with a read section which reads data from an optical disk to output read information, a determination section which determines presence/absence of an error of the read information to output an error presence/absence signal, a transfer processing section which receives the error presence/absence signal and receives a hash request signal and transfers the hash request signal when the error presence/absence signal indicates the absence of an error, and does not transfer the hash request signal when the error presence/absence signal indicates the presence of an error, and a processing section which performs hash processing to the read information upon reception of the hash request signal.

Abstract: A content reproducing apparatus includes: a disc drive device that reproduces content recorded on a recording medium; a network controller that controls data transmission between an external server specified by the content reproduced by the disc drive device; a content protection encoder/decoder unit that: (1) encodes a request to be sent to the external server via a proxy server that decodes the request; and (2) decodes a response from the external server being transmitted in response to the request decoded by the proxy server, the response being encoded by the proxy server; and a controller that controls the network controller and the content protection decode/encoder unit.

Abstract: According to one embodiment, a playback apparatus includes a data read-out unit which reads out digital content from a storage medium, a copy control information update process unit which executes, if a second copy control information is defined in a file stored in the storage medium, a process of replacing a first copy control information which is embedded in the digital content that is read out of the storage medium, with the second copy control information, and a copy restriction process unit which analyzes the digital content that is output from the copy control information update process unit and executes a copy restriction process for restricting copy of the digital content, in accordance with one of the first copy control information and the second copy control information, which is embedded in the digital content.

Abstract: According to one embodiment, a firmware protection method applied to an electronic apparatus comprising a chip of a processor, wherein the processor stores external unique information and chip unique information that is assigned uniquely to the chip, the firmware protection method comprising: transferring a firmware to the electronic apparatus, the firmware subjected to an encryption and a tampering check data addition by using information that is identical with the external unique information; performing a tampering check and a decryption of the firmware by using the external unique information stored in the chip; performing an encryption of the firmware and an addition of a tampering check data to the firmware by using the chip unique information; and storing the firmware in a predetermined storage.

Abstract: According to one embodiment, a playback apparatus includes a unit which determines whether a value of a pointer included in each of video object units read out of a storage media is larger than the total number of hash values in a content hash table stored in the storage media, a unit which computes a hash value of a video object unit selected at a given probability from among the video object units read out of the storage media and determines whether the computed hash value coincides with a hash value stored in a hash entry indicated by a pointer included in the selected video object unit, and a unit which stops playing back digital content when the value of the pointer is larger than the total number of hash values or when the computed hash value does not coincide with the hash value stored in the hash entry.