Kabushiki Kaisha Toshiba

Verance Corporation

Taku Katoh

Naoki Endoh

Hisashi Yamada

Chong U Lee

Koichi Hirayama

Hirofumi Muratani

Kamran Moallemi

Takehisa Kato

Kenjiro Endoh

Naoki Endo

Katherine S Lam

A record medium comprises an original data obtained by superimposing a presentation target data, to which an error correction encoding is performed and an identification information.

Record medium, record medium manufacturing device, computer readable record medium on which program is recorded, and data presentation device

A system () for scrambling digital samples () of multimedia data, including audio and video data samples, such that the content of the samples is degraded but still recognizable, or otherwise provided at a desired quality level. The samples may be in any conceivable compressed or uncompressed digital format, including Pulse Code Modulation (PCM) samples, samples in floating point representation, samples in companding schemes (e.g., &#x3bc;-law and A-law), and other compressed bit streams. The quality level may be associated with a particular signal to noise ratio, or quality level that is determined by objective and/or subjective tests, for example. A number of LSBs can be scrambled in successive samples in successive frames (FRAME A, FRAME B, FRAME C). Moreover, the parameters for scrambling may change from frame to frame. Furthermore, all or part of the scrambling key () can be embedded () in the scrambled data and recovered at a decoder () to be used in descrambling. After descrambling, the scramble key is no longer recoverable because the scramble key itself is scrambled by the descrambler.

Multimedia adaptive scrambling system (MASS)

The invention relates to an information processing device with an access control function. This device comprises a first storage section storing at least one access information item that can be updated, a second storage section selectively storing at least one item of the access information, which was stored at least once in the past or is stored at present in the first storage section, a determination section for determining whether access by another information processing device is permissible or should be rejected, on the basis of the access information stored in the first or second storage section, and an access control section for controlling the another information processing device on the basis of the determination result of the determination section.

Access control for an information processing device

A digital watermark embedding device has an input section which inputs pixel value data of an image which is a target for embedding of watermark information, an embedded position selection section which determines a position in frequency domain into which the watermark information is to be embedded, irrespectively of a frequency component value, a frequency component value variation decision section which determines a variation of a frequency component value at each embedded position determined by the embedded position selection section, a pixel value variation calculation section which calculates a variation of a pixel value at each point in pixel value domain of the image based on the embedded position in frequency domain determined by the embedded position selection section and on the variation of a frequency component value determined by the frequency component value variation decision section, a pixel value conversion section which embeds watermark information by changing corresponding pixel value data of the image in accordance with the variation of a pixel value at each point in pixel value domain calculated by the pixel value variation calculation section, and an output section which outputs pixel value data of the image into which watermark information has been embedded.

Digital watermark embedding device, digital watermark detection device and recording medium recording computer readable program for realizing functions of two devices

In an embodiment, a copy-guard system is provided that includes a decoding section for decoding digital data, which is encoded and error-correction-coded, from an information recording medium in which key information encoded for the digital data is recorded, an encoded digital data acquisition section for acquiring digital data encoded by error-correcting the digital data decoded by the decoding section, a detection section for detecting an error position and an error symbol value of the encoded digital data, identification information detection section for detecting an identification information representing whether the information recording medium is original or copied and which is replaced with a part of the digital data encoded and error-correction-coded, based on the error position and the error symbol value detected by the detection section, a determination section for determining whether a copy of the information recording medium is protected, and a copy protection section.

Growing community of inventors

Kamakura, Japan

Taku Katoh