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    • 30. 发明申请
    • THE COPY PROTECTION OF DIGITAL DATA
    • 数字数据的复制保护
    • WO2003005355A1
    • 2003-01-16
    • PCT/GB2002/001360
    • 2002-03-21
    • MACROVISION CORPORATIONHEYLEN, Richard, A., A.
    • HEYLEN, Richard, A., A.
    • G11B20/00
    • G11B20/00927G11B20/00086G11B20/10527G11B20/18G11B20/1809G11B20/1876H03M13/15H03M13/151H03M13/2924
    • In a system for protecting encoded digital data, for example, on a digital audio compact disc (CD-DA), specific audio samples are altered to cause spikes which are audible as clicks if played. All of the codewords in the encoded data which contain those altered samples are then identified, and data in each codeword is changed such that on decoding, the codewords will be identified as uncorrectable. Thus, if the decoded data is played by an audio player, error flags are reliably set so that error concealment, such as interpolation, is invoked and the spikes are inaudible. However, a data reader will either pass the uncorrectable data unchanged or will attempt to correct it. Therefore if a copy of the audio data is made, the clicks will be audible on playback.
    • 在用于保护编码的数字数据的系统中,例如在数字音频光盘(CD-DA)上,特定的音频样本被改变以引起如果播放时作为点击听起来的尖峰。 然后识别包含那些改变的样本的编码数据中的所有码字,并且改变每个码字中的数据,使得在解码时,码字将被识别为不可校正。 因此,如果由音频播放器播放解码的数据,则可靠地设置错误标志,使得诸如插值之类的错误隐藏被调用并且峰值听不见。 但是,数据读取器将不通过不可修正的数据,或者尝试更正它。 因此,如果制作了音频数据的副本,则播放时的点击次数将是可听见的。