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HDCP and DVI? Any problems?

Discussion in 'Projectors, Screens & Video Processors' started by dancingmatt, Jul 6, 2005.

  1. dancingmatt

    dancingmatt
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    Hi

    I was reading about HDMI cables and HDCP protection, and if you connect 1 source that supports HDCP to another that doesn't then you don't get a picture.

    So could there be a problem with connecting a PC's normal DVI socket to a PJ's HDMI which has HDCP?

    And whilst we're on this, which is cheaper - DVI to HDMI or HDMI to HDMI + a DVI/HDMI adaptor?

    Thanks

    DM
     
  2. kurtz

    kurtz
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    Its the signal source that's responsible for encrypting the signal for HDCP, so in your case that would the be PC - which won't encrypt it. But you're covered anyway because the PJ has HDMI, which is HDCP compatible and will accept an unencrypted or an encrypted signal.

    The combination that would give trouble would be an encrypted source and a sink which cannot decrypt (i.e. a non-HDCP DVI input).
     
  3. Welwynnick

    Welwynnick
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    What is important is whether HDCP is applied, which is up to the source. The source may do this permanently, only when user selected, or automatically when required by the material (eg hidef film on Sky or blu-ray). Just because the source has an HDMI output doesn't mean that you can't connect it to a display with DVI without HDCP.

    Most people don't realise that HDCP is not obligatory with HDMI - it's optional, just the same as with DVI. However HDCP support is required to watch copy protected material.

    There will be no problem with doing that whatsoever from the HDCP point of view because the PJ will only decode HDCP when is it is detected. However, the picture may not look right. PC video is different to AV video - max white, max black and the gamma slope are different - this won't stop you connecting via DVI, but you would have to make some adjustments.

    It doesn't make much difference, but adaptors are quite cheap, and give you more flexibility. HDMI cables are probably better over longer runs.

    Nick
     

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