Included Mini-DVI to DVI adapter does not support HDCP and iTunes HD movies

Hi.
Just downloaded Twilight in HD (to own) from the iTunes Store and had the annoying message about HDCP not being supported by my display, and that I could not play the movie in HD.
My Mac Mini is plugged to a very HDCP-compliant Sony Bravia 40" LCD TV via Apple's mini-DVI to DVI adapter (included in the new Mac Mini's box) and a DVI to HDMI cable.
(HDCP works well for this TV with a PS3, another Sony Blu-Ray player (the 2 are for zones A and B), an AppleTV)
Since I have other recent Macs with a Mini DisplayPort, I happen to also have an Apple branded Mini DisplayPort to DVI adapter.
So I replaced the (mini-DVI to DVI) adapter by the (Mini DisplayPort to DVI) adapter and plugged it on the Mini DisplayPort on the Mac Mini.
I can now play the HD version on my Sony TV!!
This really sounds like a joke!
A joke that is going to make me go the shop and buy another (Mini DisplayPort to DVI) adapter, since I like to always have one, as well as the VGA adapter, with my MacBooks.
Let's hope there will sonn be an iTunes, Leopard, or mini-DVI to DVI adapter firmware update very soon to fix this.

I am actually very surprised that your miniDisplayPort to DVI transition works with HD content.
I'd consider that a bonus and cherish it until Apple removes that functionality in a future update.
It is probably a bug as it should not work.
The thing to keep in mind is that DVI cables do not support the necessary DRM/encryption signals for HD video content.
This is one of the main reason DisplayPort was introduced.
So I am not surprised that miniDVI to DVI to HDCP does not play HD content on your TV.
In fact this is +expected behavior+ due to the lack of DRM/encryption signals.
No matter how you convert from miniDVI to DVI, the port cannot create something that it doesn't have in the first place.
The more I am surprised that the miniDisplayPort to DVI to HDCP transition provides these signals. I would have expected them to be filtered out in the DVI cable in the middle as this cable cannot pass something on that DVI is not designed to carry (HD DRM/encryption signals).
It could very well be a 'bug' in the miniDisplayPort to DVI cable controller, which Apple might 'fix' in a future driver update.
It is likely a mistake that this works.
What you really need is a miniDisplayPort to DisplayPort to HDCP conversion. Or directly a miniDisplayPort to HDCP cable. Those are the only routes that are guaranteed to work passing HD video DRM/encryption signals along.
But as far as i know neither of these two cables are available yet.
Which might be the reason why Apple - for the time being - allows your miniDisplayPort to DVI route to work. Emphasis on +for the time being+.
I would not count on the fact that this will work forever.
And I would certainly not count on a software update that will make the DVI route work. This will never work due to DVI's incapacity of providing DRM/encryption signals for HD content.

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