公开(公告)号：US07107452B2

公开(公告)日：2006-09-12

申请号：US11209238

申请日：2005-08-22

申请人： Xavier Serret-Avila ,  Gilles Boccon-Gibod

发明人： Xavier Serret-Avila ,  Gilles Boccon-Gibod

IPC分类号： H06F1/26

CPC分类号： G06F21/10 ,  G06F2221/07 ,  G06T1/0071 ,  G11B20/00086 ,  G11B20/00123 ,  G11B20/00884 ,  G11B20/00898 ,  H04L9/3236 ,  H04L9/3247 ,  H04L2209/608 ,  H04N1/32144 ,  H04N1/32208 ,  H04N1/32283 ,  H04N1/32288 ,  H04N1/32293 ,  H04N1/32304 ,  H04N1/3232 ,  H04N5/913 ,  H04N7/162 ,  H04N19/00 ,  H04N19/467 ,  H04N21/23892 ,  H04N21/4627 ,  H04N21/8358 ,  H04N2005/91335 ,  H04N2201/3235

摘要： Systems and methods are provided for protecting and managing electronic data signals that are registered in accordance with a predefined encoding scheme, while allowing access to unregistered data signals. In one embodiment a relatively hard-to-remove, easy-to-detect, strong watermark is inserted in a data signal. The data signal is divided into a sequence of blocks, and a digital signature for each block is embedded in the signal via a watermark. The data signal is then stored and distributed on, e.g., a compact disc, a DVD, or the like. When a user attempts to access or use a portion of the data signal, the signal is checked for the presence of a watermark containing the digital signature for the desired portion of the signal. If the watermark is found, the digital signature is extracted and used to verify the authenticity of the desired portion of the signal. If the signature-containing watermark is not found, the signal is checked for the presence of the strong watermark. If the strong watermark is found, further use of the signal is inhibited, as the presence of the strong watermark, in combination with the absence or corruption of the signature-containing watermark, provides evidence that the signal has been improperly modified. If, on the other hand, the strong mark is not found, further use of the data signal can be allowed, as the absence of the strong mark indicates that the data signal was never registered with the signature-containing watermark.

摘要翻译： 提供了系统和方法，用于保护和管理根据预定编码方案注册的电子数据信号，同时允许访问未注册的数据信号。 在一个实施例中，相对难以移除的易于检测的强水印被插入到数据信号中。 数据信号被分成块序列，每个块的数字签名通过水印被嵌入在信号中。 然后将数据信号存储并分布在例如光盘，DVD等上。 当用户尝试访问或使用数据信号的一部分时，检查信号是否存在包含用于信号的期望部分的数字签名的水印。 如果发现水印，则提取数字签名并用于验证信号所需部分的真实性。 如果没有找到包含签名的水印，则检查该信号是否存在强水印。 如果发现强水印，则抑制了信号的进一步使用，因为强水印的存在与含签名的水印的不存在或破坏相结合，提供了信号被不正确地修改的证据。 另一方面，如果没有发现强标记，则可以允许进一步使用数据信号，因为没有强标记表示数据信号从未向含有签名的水印注册。