CONTROLLING DISTRIBUTION AND USE OF DIGITAL WORKS
    1.
    发明申请
    CONTROLLING DISTRIBUTION AND USE OF DIGITAL WORKS 审中-公开
    控制分布和使用数字工作

    公开(公告)号:US20090276635A1

    公开(公告)日:2009-11-05

    申请号:US11721060

    申请日:2005-12-07

    IPC分类号: G06F21/24 G06F21/00

    摘要: In order to efficiently prevent the save-and-restore attack on usage rights associated with digital work, these usage rights are protected by a hidden channel. In order to make it a difficult or expensive to manipulate the hidden channel, a device is proposed comprising: writing means (34) for writing on a record carrier (20) said digital work (DW) and attached usage right information (22) defining one or more conditions to be satisfied in order for the usage right to be exercised,—fingerprint extraction means (23) for deriving fingerprint data (24) from physically uncontrollable, changeable non-uniformities on said record carrier (20), and authentication means (25) for generating authentication data (26) from said fingerprint data (24) and said usage right information (22), said authentication data being provided for authenticating said usage right information, said writing means (34) being adapted for writing said authentication data (25) on said record carrier (20).

    摘要翻译: 为了有效地防止与数字作品相关的使用权的保存和恢复攻击,这些使用权利被隐藏的信道保护。 为了使操作隐藏通道变得困难或昂贵,提出了一种设备,包括:写入装置(34),用于在记录载体(20)上写入所述数字作业(DW)和附加的使用权信息(22),其定义 为了使用权被行使而要满足的一个或多个条件, - 指纹提取装置(23),用于从所述记录载体(20)上的物理上不可控制的,可变的非均匀性导出指纹数据(24);以及认证装置 (25),用于从所述指纹数据(24)和所述使用权信息(22)生成认证数据(26),所述认证数据被提供用于认证所述使用权信息,所述写入装置(34)适于写入所述认证 所述记录载体(20)上的数据(25)。

    Generating and matching hashes of multimedia content
    2.
    发明申请
    Generating and matching hashes of multimedia content 有权
    生成和匹配多媒体内容的哈希

    公开(公告)号:US20080263360A1

    公开(公告)日:2008-10-23

    申请号:US11800904

    申请日:2007-05-07

    IPC分类号: H04L9/00 H04L9/06

    摘要: Hashes are short summaries or signatures of data files which can be used to identify the file. Hashing multimedia content (audio, video, images) is difficult because the hash of original content and processed (e.g. compressed) content may differ significantly. The disclosed method generates robust hashes for multimedia content, for example, audio clips. The audio clip is divided (12) into successive (preferably overlapping) frames. For each frame, the frequency spectrum is divided (15) into bands. A robust property of each band (e.g. energy) is computed (16) and represented (17) by a respective hash bit. An audio clip is thus represented by a concatenation of binary hash words, one for each frame. To identify a possibly compressed audio signal, a block of hash words derived therefrom is matched by a computer (20) with a large database (21). Such matching strategies are also disclosed. In an advantageous embodiment, the extraction process also provides information (19) as to which of the hash bits are the least reliable. Flipping these bits considerably improves the speed and performance of the matching process.

    摘要翻译: 哈希是数据文件的简短摘要或签名,可用于标识文件。 哈希多媒体内容(音频,视频,图像)是困难的,因为原始内容的哈希和处理(例如压缩的)内容可能会显着不同。 所公开的方法为多媒体内容(例如,音频剪辑)生成鲁棒散列。 音频剪辑被分割成连续的(优选重叠的)帧。 对于每个帧,频谱被分为(15)到频带。 计算每个频带(例如能量)的鲁棒性质(16)并通过相应的散列比特(17)表示。 因此,音频剪辑由二进制散列字的连接表示,每个帧一个。 为了识别可能压缩的音频信号,由计算机(20)与大数据库(21)匹配从其导出的散列字块。 还披露了这种匹配策略。 在有利的实施例中,提取过程还提供关于哪个散列位是最不可靠的信息(19)。 翻转这些位可显着提高匹配过程的速度和性能。

    Driving a light source
    7.
    发明授权
    Driving a light source 有权
    驾驶光源

    公开(公告)号:US08253353B2

    公开(公告)日:2012-08-28

    申请号:US12668034

    申请日:2008-07-14

    IPC分类号: H05B37/02

    摘要: A method for driving a light source (11, 12, 13) is described, wherein the light source is alternately switched ON and OFF in an ON/OFF pattern, wherein the duty cycle of the ON/OFF pattern is varied to vary the average light intensity of the light source, and wherein the shape of the ON/OFF pattern is varied to transmit data. Thus, a control signal for the light source comprises data information as well as duty cycle information. The duty cycle is varied within a range from almost zero to almost 100%, and data is varied and transmitted without affecting the duty cycle.

    摘要翻译: 描述了用于驱动光源(11,12,13)的方法,其中在ON / OFF模式中光源被交替地接通和断开,其中ON / OFF模式的占空比被改变以改变平均值 光源的光强度,并且其中ON / OFF图案的形状被改变以传输数据。 因此,用于光源的控制信号包括数据信息以及占空比信息。 占空比在几乎零到几乎100%的范围内变化,并且数据被变化和传输而不影响占空比。

    Method of joint decoding of possibly mutilated code words
    9.
    发明授权
    Method of joint decoding of possibly mutilated code words 失效
    联合解码可能残缺码字的方法

    公开(公告)号:US07185263B2

    公开(公告)日:2007-02-27

    申请号:US10506375

    申请日:2003-02-14

    IPC分类号: H03M13/00

    CPC分类号: H03M13/37 G11B20/18

    摘要: A method of decoding possibly mutilated code words (r) of a code (C) includes decoding the differences (D) of a number (L−1) of pairs of possibly mutilated code words (rib, ri+1) to obtain estimates (u, v) for the differences of the corresponding pairs of code words (ci, ci+1), combining the estimates (u, v) to obtain a number (L) of at least two corrupted versions (wj) of a particular code word (c), forming a code vector (z) from the number (L) of corrupted versions (wj) of the particular code word (c) in each coordinate, decoding the code vector (z) to a decoded code word (c′) in the code (C), and using the generator matrix (G) to obtain the information word (m) and the address word (a) embedded in the decoded code word (c′).

    摘要翻译: 解码代码(C)的可能残缺代码字(r)的方法包括解码可能残缺的代码字对(L-1)的数量(L-1)的数量(L-1) (i,i + 1),以获得对应的代码字对(c i,i i,i i + 1)的差的估计(u,v) 将所述估计(u,v)组合以获得特定码字(c)的至少两个损坏版本(w SUB)的数目(L),形成码矢量( z)从每个坐标中的特定码字(c)的损坏版本号(L)的数量(L)开始,将码矢量(z)解码为解码码字(c'), 在代码(C)中,并且使用生成矩阵(G)来获得嵌入在解码码字(c')中的信息字(m)和地址字(a)。

    Modulation for coded light transmission
    10.
    发明申请
    Modulation for coded light transmission 有权
    编码光传输调制

    公开(公告)号:US20130202310A1

    公开(公告)日:2013-08-08

    申请号:US13879253

    申请日:2011-10-19

    IPC分类号: H04B10/116

    CPC分类号: H04B10/116 H05B37/0272

    摘要: Coded light has been proposed to enable advanced control of light sources and transmit information using light sources. Sequences of channel symbols to drive the light source are determined from sequences of source symbols such that no visible flicker is present in coded light emitted by the light sources. Each source symbol is mapped to a composite channel symbol comprising at least one first channel symbol which may be identical to the current source symbol and at least one second channel symbol which may be a function of the current source symbol and at least one future and/or past source symbol.

    摘要翻译: 已经提出编码光使得能够使用光源对光源进行高级控制和传输信息。 用于驱动光源的通道符号的序列由源符号的序列确定,使得在由光源发射的编码光中不存在可见的闪烁。 每个源符号被映射到复合信道符号,该复合信道符号包括至少一个第一信道符号,其可以与当前源符号相同,并且至少一个第二信道符号可以是当前源符号和至少一个未来的函数,和/ 或过去的源符号。