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I have a dual-link (2560x1440) DVI monitor connected to my computer (2015 retina MbP) through the Apple Mini DisplayPort to Dual-Link DVI adapter. It is reported as not HDCP-complient by iTunes and Netflix. Is this because the monitor doesn't support HDCP, or because the adapter doesn't pass the HDCP?

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Here's what Apple says about this:

Apple Mini DisplayPort adapters that offer digital connections—such as the Apple Mini DisplayPort to Dual-Link DVI adapter and the Apple Mini DisplayPort to DVI adapter—support HDCP content. Apple Mini DisplayPort adapters that offer analog connections—such as the Apple Mini DisplayPort to VGA adapter—do not support HDCP content.

Also, I found this answer on an Apple site but I can't verify if it's correct so YMMV:

Here is what I found a) Mini DP to DP will offer full resolution 2560 X 1080 @ 60 Hz but HDCP content from iTunes is not permitted, ie. will not run; b) HDMI adapter to DVI-D allows HDCP content to run but the resolution is limited to 1920 x 1080 @ 60Hz; c) HDMI to HDMI also does not offer full resolution but allows access to HDCP content; finally, the only configuration that offers both full resolution and HDCP is with Mini Display Port to Dual DVI-D cables.

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