Copy-guard system and information recording medium used in the same system
    1.
    发明授权
    Copy-guard system and information recording medium used in the same system 失效
    复制保护系统和信息记录介质在同一系统中使用

    公开(公告)号:US06556679B1

    公开(公告)日:2003-04-29

    申请号:US09195914

    申请日:1998-11-19

    IPC分类号: H04N7167

    摘要: 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.

    摘要翻译: 在一个实施例中,提供了一种复制保护系统,其包括:解码部分,用于从其中记录用于数字数据编码的密钥信息的信息记录介质对由数字数据进行编码和纠错编码的数字数据进行解码, 数字数据获取部分,用于获取通过对由解码部分解码的数字数据进行纠错编码的数字数据,检测部分,用于检测编码数字数据的错误位置和误差符号值;识别信息检测部分,用于检测识别信息 表示信息记录介质是原始还是复制的,并且基于由检测部分检测的错误位置和错误符号值,被编码和纠错编码的数字数据的一部分替代,确定部分,用于确定 信息记录介质的副本是否被保护,以及复制保护部分。

    Digital watermark embedding device, digital watermark detection device and recording medium recording computer readable program for realizing functions of two devices
    2.
    发明授权
    Digital watermark embedding device, digital watermark detection device and recording medium recording computer readable program for realizing functions of two devices 失效
    数字水印嵌入装置,数字水印检测装置和用于实现两个装置的功能的记录介质记录计算机可读程序

    公开(公告)号:US06757405B1

    公开(公告)日:2004-06-29

    申请号:US09450337

    申请日:1999-11-29

    IPC分类号: G06K900

    摘要: 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.

    摘要翻译: 数字水印嵌入装置具有:输入部,输入作为用于嵌入水印信息的目标的图像的像素值数据;嵌入位置选择部,其确定要嵌入水印信息的频域中的位置,无论如何 频率分量值变化判定部,其确定由嵌入位置选择部确定的每个嵌入位置处的频率分量值的变化;像素值变化计算部,其计算各个像素值的变化量; 基于由嵌入位置选择部确定的频域中的嵌入位置和由频率分量值变化判定部确定的频率分量值的变化的图像的像素值域中的点,嵌入水印的像素值变换部 信息通过改变correspo 根据由像素值变化计算部计算的像素值域中的每个点处的像素值的变化,输出图像的像素值数据;以及输出部,其输出水印信息已经被绘制的图像的像素值数据 嵌入式

    Multimedia adaptive scrambling system (MASS)
    4.
    发明授权
    Multimedia adaptive scrambling system (MASS) 失效
    多媒体自适应加扰系统(MASS)

    公开(公告)号:US06888943B1

    公开(公告)日:2005-05-03

    申请号:US09692084

    申请日:2000-10-19

    摘要: A system (300, 500) for scrambling digital samples (115, 200, 250, 260, 270) 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., μ-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 (310) can be embedded (340) in the scrambled data and recovered at a decoder (400, 600) to be used in descrambling. After descrambling, the scramble key is no longer recoverable because the scramble key itself is scrambled by the descrambler.

    摘要翻译: 一种用于对包括音频和视频数据样本的多媒体数据的数字样本(115,200,250,260,270)进行加扰的系统(300,500),使得样本的内容降级但仍可识别,或以其他方式提供 期望的质量水平。 样本可以是任何可想到的压缩或未压缩的数字格式,包括脉冲编码调制(PCM)样本,浮点表示中的采样,压缩方案中的采样(例如,μ律和A律)以及其他压缩比特流。 质量水平可能与特定的信噪比或由客观和/或主观测试所确定的质量水平相关联。 可以在连续帧(FRAME A,FRAME B,FRAME C)中的连续采样中对多个LSB进行加扰。 此外,用于加扰的参数可以从帧到帧改变。 此外,加扰密钥(310)的全部或部分可以被嵌入(340)在加扰数据中,并在解码器(400,600)中被恢复以用于解扰。 解扰后,加密密钥本身由解扰器加扰,不再可恢复。

    Access control for an information processing device
    5.
    发明授权
    Access control for an information processing device 失效
    信息处理设备的访问控制

    公开(公告)号:US06779044B1

    公开(公告)日:2004-08-17

    申请号:US09387770

    申请日:1999-09-01

    申请人: Taku Katoh

    发明人: Taku Katoh

    IPC分类号: G06F300

    摘要: 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.

    摘要翻译: 本发明涉及一种具有访问控制功能的信息处理设备。 该设备包括存储可以被更新的至少一个访问信息项的第一存储部分,选择性地存储至少一个访问信息项目的第二存储部件,其至少存储在过去一次,或者当前存储在 第一存储部分,确定部分,用于基于存储在第一或第二存储部分中的访问信息来确定是否允许或应该拒绝另一信息处理设备的访问;以及访问控制部分,用于控制另一信息处理 基于确定部分的确定结果的装置。