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公开(公告)号：US20080276324A1
公开(公告)日：2008-11-06
申请号：US11911122
申请日：2006-04-12
IPC分类号： G11B20/00
CPC分类号： G11B20/00086 , G06T1/005 , G06T2201/0052 , G06T2201/0063 , G10L19/018 , G11B20/00884 , G11B20/00891 , G11B20/00905 , H04N19/467 , H04N19/61
摘要： In watermarking systems, hackers may try to remove the watermark using a so-called collusion attack. If the attacker has access to multiple identical signals with different watermarks (this typically occurs in electronic content delivery systems), simply averaging the signals will remove the watermark energy. A known solution to this problem is phase modulation. By modulating the phase of the signals, the averaging attack will cause phase cancellation to occur and annoying artifacts to be introduced. In the prior art, said phase modulation is carried out in the base-band domain, prior to watermark embedding. The present invention enables phase modification efficiently to be applied to transform coded signals, in particular DCT or MDCT coded signals such as MP3 or AAC audio signals, or MPEG2 video signals. The bitstream is partially decoded (4) and re-encoded (7). In accordance with the invention, the phase modification is now performed by an appropriately modified version of the forward or inverse (M)DCT transform algorithm (9). The phase modulation is thus an integral part of the decoding process (before watermark embedding) or the encoding process (after watermark embedding), which is very efficient. The phase modulation is controlled by parameters provided by a control function (5).
摘要翻译： 在水印系统中，黑客可能会尝试使用所谓的串通攻击去除水印。 如果攻击者可以访问具有不同水印的多个相同的信号（这通常发生在电子内容传送系统中），简单地平均信号将消除水印能量。 这个问题的一个已知的解决方案是相位调制。 通过调制信号的相位，平均化攻击将导致相位消除发生和烦人的伪像被引入。 在现有技术中，在水印嵌入之前，在基带域中执行所述相位调制。 本发明使得能够有效地进行相位修改以变换编码信号，特别是DCT或MDCT编码信号，例如MP3或AAC音频信号或MPEG2视频信号。 比特流被部分解码（4）并重新编码（7）。 根据本发明，现在通过正向或反向（M）DCT变换算法（9）的适当修改的版本执行相位修改。 因此，相位调制是解码处理（水印嵌入之前）或编码处理（水印嵌入之后）的组成部分，这是非常有效的。 相位调制由控制功能（5）提供的参数控制。
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公开(公告)号：US20090013188A1
公开(公告)日：2009-01-08
申请号：US12162369
申请日：2007-01-29
IPC分类号： H04L9/00
CPC分类号： G06T1/005 , G06T2201/0065
摘要： The invention relates to a method of searching for a watermark in a data signal, and to a watermark detector, such as a copy-control watermark detector. The search is conducted in order to find a watermark in content which possibly has been attacked and/or altered. The search is conducted by the steps of determining or setting a search space for the data signal, selecting a subspace of the search space, and searching for the presence of the watermark in the subspace. The subspace may be selected from a multitude of regions, the selection e.g. being based on a deterministic or probabilistic function.
摘要翻译： 本发明涉及一种在数据信号中搜索水印的方法以及诸如拷贝控制水印检测器之类的水印检测器。 进行搜索以便在可能已被攻击和/或改变的内容中找到水印。 通过确定或设置数据信号的搜索空间，选择搜索空间的子空间以及在子空间中搜索水印的存在的步骤进行搜索。 子空间可以从多个区域中选择，例如， 基于确定性或概率函数。
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公开(公告)号：US20080310629A1
公开(公告)日：2008-12-18
申请号：US12094638
申请日：2006-11-10
IPC分类号： G06T1/00
CPC分类号： G06T1/005
摘要： The invention relates to embedding auxiliary data in the form of a multibit payload in a host signal, and encrypting the associated detection key. Moreover, the invention relates to extracting the auxiliary data in the form of the multibit payload from a data signal. Auxiliary data is embedded in a host signal by the following steps. First a reference watermark is provided, subsequently an encrypted detection key associated only with the reference watermark is generated. The encrypted detection key may be a scrambled version of the watermark. In a further step, the multibit watermark is generated and a multibit payload is encoded into the reference watermark. Finally, the multibit watermark is embedded into the host signal.
摘要翻译： 本发明涉及以主机信号中的多位有效载荷的形式嵌入辅助数据，并加密相关的检测密钥。 此外，本发明涉及从数据信号中提取多位有效载荷形式的辅助数据。 辅助数据通过以下步骤嵌入到主机信号中。 首先，提供参考水印，随后生成与参考水印相关联的加密检测密钥。 加密检测密钥可以是水印的加扰版本。 在另一步骤中，生成多比特水印并将多比特有效载荷编码为参考水印。 最后，将多位水印嵌入到主机信号中。
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4.发明申请WARERMARKING AND ENCRYPTION OF ENTROPY-CODED DATA USING ADDITIVE HUFFMAN TABLE 审中-公开使用添加剂HUFFMAN表加密和加密熵编码数据公开(公告)号：US20100177888A1
公开(公告)日：2010-07-15
申请号：US12667247
申请日：2008-07-01
CPC分类号： G06T1/0035 , G06T2201/0052 , G06T2201/0053 , H04N7/1675 , H04N19/13 , H04N19/467 , H04N19/48 , H04N21/2347 , H04N21/4405 , H04N21/8358
摘要： A secure forensic watermarking system is disclosed that distributes the same encrypted content to all users. The decryption key is different for each user, so that the decrypted content differs slightly from the original, i.e. is watermarked. Forensic tracking is possible by distributing unique decryption keys to individual users. The invention allows a forensic mark to be securely embedded in the compressed domain signal. In an embodiment of this invention, the content (x) and an encryption sequence (r) are entropy encoded using a homomorphic Huffman table. A homomorphic Huffmann table is a table H having the property that there exists an operation f( ) such that H-1 (f(H(a),H(b)))=a+b.
摘要翻译： 公开了一种安全的法医水印系统，其将相同的加密内容分发给所有用户。 解密密钥对于每个用户是不同的，使得解密的内容与原始内容略有不同，即被加密。 通过向个别用户分发唯一的解密密钥可以进行取证跟踪。 本发明允许将法医标记安全地嵌入到压缩域信号中。 在本发明的一个实施例中，内容（x）和加密序列（r）使用同态霍夫曼表进行熵编码。 同形霍夫曼表是具有存在使得H-1（f（H（a），H（b）））= a + b的操作f（）的性质的表H。
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公开(公告)号：US20100082478A1
公开(公告)日：2010-04-01
申请号：US12530561
申请日：2008-03-10
CPC分类号： H04N1/4426 , G06F21/10 , G06F2221/0737 , G06F2221/2117 , G06Q20/10 , G06T1/0021 , H04N1/4486
摘要： The present invention relates to methods and apparatus for digital content distribution. A method of transferring digital content from a first entity (60) to a second entity (70) includes the steps of: a transfer control entity (50) transmitting a transmission key (KA) to the first entity, the first entity storing content data comprising digital content embedded with a first watermark (WA). The first entity applies the transmission key to the content data to remove the first watermark from the digital content and encrypt the digital content. The first entity transmits the encrypted digital content (CX) to the second entity. The transfer control entity transmits a receive key (KB) to the second entity and the second entity applies the receive key to the encrypted digital content to generate decrypted data comprising the decrypted digital content embedded with a second watermark (WB).
摘要翻译： 本发明涉及数字内容分发的方法和装置。 将数字内容从第一实体（60）传送到第二实体（70）的方法包括以下步骤：传送控制实体（50）向第一实体发送传输密钥（KA），第一实体存储内容数据 包括嵌入第一水印（WA）的数字内容。 第一实体将传输密钥应用于内容数据，以从数字内容中移除第一水印并加密数字内容。 第一实体将加密的数字内容（CX）发送到第二实体。 转移控制实体向第二实体发送接收密钥（KB），第二实体将接收密钥应用于加密的数字内容，以生成包含用第二水印（WB）嵌入的解密的数字内容的解密数据。
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公开(公告)号：US20090046819A1
公开(公告)日：2009-02-19
申请号：US11577368
申请日：2005-10-14
IPC分类号： H03D1/04
CPC分类号： H04N19/124 , G10L19/173 , H04N19/40 , H04N19/467
摘要： There is described a system (10; 300) for processing an input signal (340) to generate a corresponding encoded output signal (380). The system (10; 300) includes a plurality of quantizing devices (30, 70; 350, 370) coupled in series, the system (10; 300 being configured in operation to reduce tandem quantization noise arising therein by:(a) analyzing the system (10; 300) to determine signal regions (290) in which tandem noise errors occur; and (b) modifying one or more earlier quantizing devices (30; 350) in the system (10; 300) with backward correction to reduce tandem noise arising therein from said determined signal regions (290), said one or more earlier quantizing devices (30; 350) not including a last quantizing device (70; 370) in series the system (10; 300).
摘要翻译： 描述了一种用于处理输入信号（340）以产生对应的编码输出信号（380）的系统（10; 300）。 系统（10; 300）包括串联耦合的多个量化装置（30,70; 350,370），所述系统（10; 300）被配置为在减少由此产生的串联量化噪声的操作中：（a） 系统（10; 300）以确定发生串联噪声误差的信号区域（290）;以及（b）用反向校正修改系统（10; 300）中的一个或多个较早的量化装置（30; 350），以减少串联 从所述确定的信号区域（290）产生的噪声，所述一个或多个较早的量化装置（30; 350）不包括系统（10; 300）串联的最后一个量化装置（70; 370）。
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公开(公告)号：US20080215889A1
公开(公告)日：2008-09-04
申请号：US12089769
申请日：2006-10-06
IPC分类号： H04L9/00
CPC分类号： G06F21/10
摘要： A system and a method of effectively detecting watermarks in a significant amount of data signals. The method, in overview, consists in pre-filtering the significant amount of data signals in order to eliminate from the final watermark detection the segments of the data signals which have no significant relevance to the owner of the copyrights of the watermark under investigation, and then performing the actual watermark detection over the remaining segments of data signals relevant to the investigation. The pre-filtering feature being implemented by a definition of one or more goal descriptors, extraction of one or more descriptors from the data signals and its content and a comparison between goal descriptors and extracted descriptors.
摘要翻译： 一种在大量数据信号中有效检测水印的系统和方法。 该方法概括地说是对大量的数据信号进行预滤波，以便从最终的水印检测中消除与被调查的水印的版权的所有者无关的数据信号段，以及 然后对与调查相关的数据信号的剩余段执行实际水印检测。 预过滤特征通过一个或多个目标描述符的定义来实现，从数据信号及其内容中提取一个或多个描述符，以及目标描述符和提取的描述符之间的比较。
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公开(公告)号：US07489798B2
公开(公告)日：2009-02-10
申请号：US10596329
申请日：2004-11-24
IPC分类号： G06K9/00
CPC分类号： G10L19/018
摘要： The invention relates to a system for detecting a watermark using informed detection. A first signal potentially having a watermark embedded is received (601) as is a second signal corresponding to the original signal. The signals are segmented (605) into symbol segments. For each symbol segment a first characteristic is determined (607) for a first section and a second characteristic is determined (609) for a second section in response to the first and second signals in those sections. Specifically, ratios between average envelopes are determined. Thus, the first and second characteristic is indicative of the variations of the envelope during a watermark symbol. A watermark symbol estimate is determined (611) from the first and second characteristic. A sequence of estimated watermark symbols is compared to reference watermark symbols and the presence of a watermark symbol is determined (615) depending on the comparison. The invention is particularly suitable for improved detection of a multiplicative watermark.
摘要翻译： 本发明涉及使用通知检测来检测水印的系统。 接收到可能具有嵌入水印的第一信号（601），就像对应于原始信号的第二信号一样。 信号被分段（605）成符号段。 对于每个符号段，响应于这些部分中的第一和第二信号，确定第一部分的第一特性（607）和第二部分的第二特性（609）。 具体来说，确定平均包络之间的比率。 因此，第一和第二特征指示在水印符号期间的包络的变化。 从第一和第二特征确定水印符号估计（611）。 将估计水印符号的序列与参考水印符号进行比较，并且根据比较确定水印符号的存在（615）。 本发明特别适用于改进的乘法水印的检测。
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公开(公告)号：US20080253476A1
公开(公告)日：2008-10-16
申请号：US12066685
申请日：2006-09-12
IPC分类号： H04L25/49
CPC分类号： G06T1/0071 , G06T1/005 , G06T2201/0052 , G06T2201/0053 , G06T2201/0063
摘要： A method and a system for modifying a bitstream signal for enabling collusion resistant bitstream watermarking. The method comprises dividing a bitstream spectral signal X[k] of the bitstream signal bx into a first signal (302) and a second signal (304); multiplying the first signal (302) by a first modification signal (306) and outputting a modified first signal (314); performing a transform operation on said second signal (304) for obtaining a transformed second signal (308); multiplying said transformed second signal (308) by a second modification signal (310) and outputting a second modified signal (312); subtracting said second modified signal (312) from said first modified signal (314) and outputting a modified bitstream spectral signal X′[k] suitable for obtaining a modified bitstream signal b′x of said bitstream signal bx. Thus an efficient manner of applying a collusion resistant property for already encoded contents is provided.
摘要翻译： 一种用于修改比特流信号以实现防串扰比特流水印的方法和系统。 该方法包括将比特流信号bx的比特流频谱信号X [k]分成第一信号（302）和第二信号（304）; 将第一信号（302）乘以第一修改信号（306）并输出修改的第一信号（314）; 对所述第二信号（304）执行变换操作以获得变换的第二信号（308）; 将所述经变换的第二信号（308）乘以第二修改信号（310）并输出第二修改信号（312）; 从所述第一修改信号（314）中减去所述第二修改信号（312），并输出适于获得所述比特流信号bx的修改的位流信号b'x的修改的比特流频谱信号X'[k]。 因此，提供了对已经编码的内容应用防串扰属性的有效方式。
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公开(公告)号：US07663527B2
公开(公告)日：2010-02-16
申请号：US11577368
申请日：2005-10-14
IPC分类号： H04N7/26
CPC分类号： H04N19/124 , G10L19/173 , H04N19/40 , H04N19/467
摘要： There is described a system (10; 300) for processing an input signal (340) to generate a corresponding encoded output signal (380). The system (10; 300) includes a plurality of quantizing devices (30, 70; 350, 370) coupled in series, the system (10; 300 being configured in operation to reduce tandem quantization noise arising therein by: (a) analyzing the system (10; 300) to determine signal regions (290) in which tandem noise errors occur; and (b) modifying one or more earlier quantizing devices (30; 350) in the system (10; 300) with backward correction to reduce tandem noise arising therein from said determined signal regions (290), said one or more earlier quantizing devices (30; 350) not including a last quantizing device (70; 370) in series the system (10; 300).
摘要翻译： 描述了一种用于处理输入信号（340）以产生对应的编码输出信号（380）的系统（10; 300）。 系统（10; 300）包括串联耦合的多个量化装置（30,70; 350,370），所述系统（10; 300）被配置为在减少由此产生的串联量化噪声的操作中：（a） 系统（10; 300）以确定发生串联噪声误差的信号区域（290）;以及（b）用反向校正修改系统（10; 300）中的一个或多个较早的量化装置（30; 350），以减少串联 从所述确定的信号区域（290）产生的噪声，所述一个或多个较早的量化装置（30; 350）不包括系统（10; 300）串联的最后一个量化装置（70; 370）。
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