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06 - HDCP

Posted in Neothings by bill on the April 10th, 2006
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There was some concern coming from the big Hollywood movie studios that the DVI interface could be the source for making perfect copies of video. To address this, the industry answered with the High Definition Copy Protection (HDCP) protocol, an encryption layer added onto DVI.

HDCP uses the DDC channel to communicate it’s encryption information, so any CAT5 or fiber solutions must have the extra lines to facilitate the extra communications. At extreme lengths, the DDC communications can fail, and the HDCP will not decrypt the video. Failure of this will result in either a blackout screen or message indicating HDCP failure, or full frames of snow with no discernable picture.

4 Responses to '06 - HDCP'

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  1. Leon said,

    on February 3rd, 2007 at 7:32 am

    a Question actually.
    so this HDCP is for copies only right?
    i wont have any problems playing Xbox 360/PS3 or watching HD videos on my HDTV (HDCP ready) TV.. right?

  2. bill said,

    on February 5th, 2007 at 11:05 am

    The game consoles probably wont use HDCP encryption when playing a game, but will if playing a movie. Keep in mind the Xbox 360 does not have HDMI at this time, so this does not apply. Also if you TV has HDCP then you shouldn’t have anything to worry about.

  3. Tony said,

    on February 20th, 2007 at 5:30 pm

    So what about a monitor that is not HDCP compliant. Is it legal to use a “black box” to convert or decode the signal so I can view it on my monitor?

  4. bill said,

    on February 20th, 2007 at 6:10 pm

    To the letter of the law (the DMCA that is), a black box that removes the HDCP encryption to allow you to use a monitor that does not support HDCP is illegal. However many civil rights advocates say this violates fair use rights.

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