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热词
    • 8. 发明授权
    • Method and system for protecting digital data from unauthorized copying
    • 保护数字数据免遭未经授权复制的方法和系统
    • US06539475B1
    • 2003-03-25
    • US09215960
    • 1998-12-18
    • Ingemar J. CoxMatthew L. Miller
    • Ingemar J. CoxMatthew L. Miller
    • H04N716
    • H04N7/24G06T1/0021H04N1/4413H04N1/4486H04N5/913H04N7/1675H04N21/4405H04N21/8358H04N2005/91335H04N2005/9135H04N2005/91364
    • Data is protected from unauthorized copying by rescrambling an unauthorized version of the data, but descrambling an authorized version of the data. This is done using a trigger signal. One property of the trigger signal is that it is preserved through signal transformations, such as one or more of compression, decompression, analog to digital conversion, and digital to analog conversion. As a result of this property the trigger signal can be detected in either scrambled or descrambled data. The trigger signal is embedded into the data to form watermarked data. The watermarked data is passed through a descrambler, where the trigger signal, if present, is extracted. A descrambling key and a descrambling algorithm are applied to the watermarked data if the trigger signal is present, but not applied to the watermarked data if the trigger signal is not present.
    • 通过对未经授权的数据进行解密,但是对数据的授权版本进行解扰,可防止数据受到未经授权的复制。 这是使用触发信号完成的。 触发信号的一个特性是通过信号转换来保存,如压缩,解压缩,模数转换和数模转换中的一个或多个。 作为该属性的结果,可以在加扰或解扰数据中检测触发信号。 触发信号嵌入到数据中以形成水印数据。 水印数据通过解扰器,其中提取触发信号(如果存在)。 如果存在触发信号,则对加密的数据应用解密密钥和解扰算法,但是如果触发信号不存在则不应用于水印数据。