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    A METHOD AND APPARATUS FOR STORING COPY PROTECTION INFORMATION SEPARATELY FROM PROTECTED CONTENT
    9.
    发明公开
    A METHOD AND APPARATUS FOR STORING COPY PROTECTION INFORMATION SEPARATELY FROM PROTECTED CONTENT 审中-公开
    用于存储复制保护信息的方法和设备分开的保护内容

    公开(公告)号：EP1825402A4

    公开(公告)日：2009-04-08

    申请号：EP05812506

    申请日：2005-10-14

    申请人： MACROVISION CORP

    发明人： RYAN JOHN O ,  QUAN RONALD ,  SALTER JAMES H

    IPC分类号： G06F17/30 ,  G06K9/00 ,  H03M1/68

    CPC分类号： G11B20/00086 ,  G11B20/00855

    摘要： A copy protection system and method enabling storage of copy protection information separately from protected content is disclosed. One embodiment includes a mechanism for playing a recording medium, the recording medium having stored thereon a digital content file and a copy protection information file, the mechanism producing a digital content signal from the digital content file and a copy protection signal from the copy protection file; a digital to analog converter operatively connected to the mechanism for converting the digital content signal to an analog signal; a copy protection detector connected to the mechanism for detecting a copy protection trigger present in the digital content signal; and a signal modifier connected to the copy protection detector for modifying the analog signal to include the copy protection signal in response to detection of the copy protection trigger.

    METHOD AND APPARATUS FOR MODIFICATIONS MADE TO A VIDEO SIGNAL TO INHIBIT THE MAKING OF ACCEPTABLE VIDEOTAPE RECORDINGS
    10.
    发明公开
    METHOD AND APPARATUS FOR MODIFICATIONS MADE TO A VIDEO SIGNAL TO INHIBIT THE MAKING OF ACCEPTABLE VIDEOTAPE RECORDINGS 失效
    进行修改的视频信号的方法和系统制造可接受的视频磁带录音防止

    公开(公告)号：EP0897635A4

    公开(公告)日：2000-11-22

    申请号：EP97926424

    申请日：1997-05-07

    申请人： MACROVISION CORP

    发明人： RYAN JOHN O

    IPC分类号： H04N5/91 ,  H04N5/913 ,  H04N9/12

    CPC分类号： H04N5/913 ,  H04N2005/91314

    摘要： A video signal is modified so that a television/receiver still produces a normal picture from the modified signal, whereas videotape recording of this signal produces generally unacceptable pictures. Videotape recorders have an automatic gain control circuit (Fig. 2) which measures the sync pulse level in a video signal and develops a gain control correction signal for keeping the video applied to an FM modulator in the videotape recording system at a fixed predetermined level. A portion of the back porch intervals following the trailing edges of a substantial number of sync pulses are significantly raised and lowered to improve the playability of the original signal without reducing the effectiveness of the copy protection of the copied signal. This is achieved most simply by adding pulses to selected lines of the video signal during the back porch interval, which pulses significantly raise or lower the voltage amplitude during the blanking interval so to provide a signal where the average value is approximately equal to the blanking interval. The sync level and the sync duration on the selected lines are also reduced to enhance the effectiveness of the process.