[mythtv-users] HDCP Key out?
Tortise
tortise at paradise.net.nz
Tue Sep 14 20:28:46 UTC 2010
----- Original Message -----
From: "Robert McNamara" <robert.mcnamara at gmail.com>
To: "Discussion about MythTV" <mythtv-users at mythtv.org>
Sent: Wednesday, September 15, 2010 8:17 AM
Subject: Re: [mythtv-users] HDCP Key out?
On Tue, Sep 14, 2010 at 1:13 PM, Tortise <tortise at paradise.net.nz> wrote:
> ----- Original Message ----- From: "Robert McNamara"
> <robert.mcnamara at gmail.com>
> To: "Discussion about MythTV" <mythtv-users at mythtv.org>
> Sent: Wednesday, September 15, 2010 3:49 AM
> Subject: Re: [mythtv-users] HDCP Key out?
>
> I for one appreciate your responding Robert, thank you.
>
>
> I am not so sure that ICT are not a part of some broadcast media, they after
> all mere digital tokens (protocol flag according to
> wikipedia) and there is no reason I can see why they cannot be transmitted
> in a broadcast stream, just as they are embedded in a BR disc stream.
>Except they're not. ICT is part of AACS, not just some MPEG stream
flag. You'd need to switch the entire infrastructure's encryption to
AACS to use the ICT. It's just plain not gonna happen (ie, you're not
going to see everyone completely scrap their existing encryption,
broadcast, and receiver equipment to do so).
I think we agree on 1 way traditional broadcasts.
> As I see it the key to ICT working is a two way information flow, to allow
> the confirmation that there is a display device at the end of the chain that
> is HDCP compliant to send HD to (else SD or nil). It seems DVB-T is a one
> way stream, so I expect Robert is correct here.
>
> What about IPTV(or an Internet two way protocol?), where a IPTV broadcaster
> uses a BR ICT enabled disc as the source in HDCP equipment and there is a
> two way digital traffic path? Seems to me that ICT and HDCP was also
> designed for this? Doesn't the schema involve a digital chain of any number
> of compatible intermediary devices / interconnects length?
>See above, that's not how the ICT works (ie, it's not part of some
tunneled encryption, it's part of a specific encryption method that is
unique to blu-ray and HD-DVD).
The IPTV example I gave uses BR discs as source, so your response suggests it could apply and to me gives no reason it couldn't
apply.
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