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Old 04-23-07, 11:39 PM   #13
pranay
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Default Re: Linux + HDCP

Very true... and I agree that a complete HDCP chain would not be possible in linux by the very nature of it being open system.

I was merely solving the problem of output to a HDCP display (above post). The question is if we have hardware that is HDCP capable then why cant we enable it when running on linux. I dont see any security issues with that.
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Old 05-02-07, 02:28 AM   #14
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Default Re: Linux + HDCP

Anyone from NVIDIA here who can enlighten me. Is there an issue if the NVIDIA driver had an option to force enable HDCP output.

As I said before, the idea is not to have a protected path for encrypted content (I know linux does not have Vista like protected mode). Its simply solving the issue of using a HDCP only device with my PC.

If what I am saying dosent make sense any explanation is much appreciated.
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Old 05-02-07, 04:35 AM   #15
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Default Re: Linux + HDCP

HDCP for a HDCP compliant HDTV is a necessity to have the full resolution on it! So it's a MUST to have it under Linux. It's near-obligatory for Nvidia to make it into their driver somehow under linux too, isnt it?
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Old 05-02-07, 05:59 AM   #16
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Default Re: Linux + HDCP

Quote:
Originally Posted by krionius
HDCP for a HDCP compliant HDTV is a necessity to have the full resolution on it!
So you're saying that such a device will not under any circumstances accept an unencrypted signal? "HDCP compliant" does not mean "requires HDCP", or are you saying that it does?
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Old 05-02-07, 06:03 AM   #17
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Default Re: Linux + HDCP

Quote:
Originally Posted by Gusar
So you're saying that such a device will not under any circumstances accept an unencrypted signal? "HDCP compliant" does not mean "requires HDCP", or are you saying that it does?
I am not a specialist, but a friend of mine told me that a HDCP compliant tv will do the full resolution only if it receives HDCP signal, please someone confirm it or tell if it's not so.
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Old 05-02-07, 06:08 AM   #18
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Default Re: Linux + HDCP

http://www.practical-home-theater-guide.com/hdcp-1.html

I am not sure if it means that if you had a HDCP TV it wont accept non HDCP content on full resolution. (Although its sure that if you TV is not HDCP compliant HDCP source will/may downgrade.)
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Old 05-02-07, 06:40 AM   #19
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Default Re: Linux + HDCP

Quote:
Originally Posted by krionius
HDCP for a HDCP compliant HDTV is a necessity to have the full resolution on it! So it's a MUST to have it under Linux. It's near-obligatory for Nvidia to make it into their driver somehow under linux too, isnt it?
as far as i know the display doesn't care wether the data is encrypted or not
(e.g. you can drive hdtvs with full hd using component outs, if you can decode
the stream on the bd/hd-dvd)

currently the procedure (running vista) is:

1) read video stream
2) decrypt it
3) decompress it (whatever compression the format uses)
4) encrypt it again (no joke)
4a) if there's no hdcp compliant device, or the device is on the media's blacklist,
downscale to standard resolution & add some garbage to the audio

5) send it through hdmi to the tv
6) decrypt again & display

steps 2), 3), 4) require the *cough* secure *cough* code path in vista and
are the main reason driver development in vista is such a pain in the ass
+ those steps are the reason for the insane system requirements
constant encryption/decryption shuffling from system to video memory (to
get some hw acceleration for decompression) and back have it's price

the whole procedure is basically a joke. hollywood's opinion about us customers
seems to be:
"every user is a potential criminal, so lets punish 'em upfront"


brave new world, cheers
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Old 05-02-07, 07:19 AM   #20
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Default Re: Linux + HDCP

Okay, my friend confirmed it. His receiver (TV HDCP compliant and 1080i capable) seeing that transmitter is not HDCP compliant will report itself as a 768 line capable receiver, and the source then sends a signal downgraded to that. So if he has a non HDCP digital signal and a HDCP TV, (like he has) signal will be downgraded. Analog component output still will be 1080i if card is capable. So there is a workaround, but not in the digital output. (So partially my friend - by personal experience - proved my previous post.) Please feel free to comment any HDCP TV users who have non HDCP digital output

That said partially nvidia should feel obligued to implement HDCP ASAP...
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Old 05-02-07, 08:48 AM   #21
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Default Re: Linux + HDCP

Quote:
Originally Posted by krionius
Okay, my friend confirmed it. His receiver (TV HDCP compliant and 1080i capable) seeing that transmitter is not HDCP compliant will report itself as a 768 line capable receiver, and the source then sends a signal downgraded to that. So if he has a non HDCP digital signal and a HDCP TV, (like he has) signal will be downgraded. Analog component output still will be 1080i if card is capable. So there is a workaround, but not in the digital output. (So partially my friend - by personal experience - proved my previous post.) Please feel free to comment any HDCP TV users who have non HDCP digital output
What is sending the signal to the tv? A HD-DVD player? A computer? What if I have a computer and just want to have a desktop at a 1920x1080 resolution - no "premium content" (this phrase makes me want to puke) involved. You're saying that this is not possible?

Also, not that it matters, but what input does the tv have - DVI or HDMI?


Quote:
Originally Posted by ze moo
as far as i know the display doesn't care wether the data is encrypted or not
That's what I thought too, but people here are saying otherwise. If this is really true, then brave new world indeed. One where I will never buy a new tv, ever.
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Old 05-02-07, 08:59 AM   #22
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Default Re: Linux + HDCP

Quote:
Originally Posted by Gusar
What is sending the signal to the tv? A HD-DVD player? A computer? What if I have a computer and just want to have a desktop at a 1920x1080 resolution - no "premium content" (this phrase makes me want to puke) involved. You're saying that this is not possible?

Also, not that it matters, but what input does the tv have - DVI or HDMI?


That's what I thought too, but people here are saying otherwise. If this is really true, then brave new world indeed. One where I will never buy a new tv, ever.
He has a computer with non HDCP videocard, trying to push out big resolution video. It's cut down by the HDCP HDTV to lower resolution - (to clear up the TV asks for lower resolution and it receives such, so you cant set your output to such big resolution). Through DVI he is putting it through.
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Old 05-02-07, 09:04 AM   #23
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Default Re: Linux + HDCP

Although I started this I was talking about some professional(read special use) display... dont think consumer TVs will reject unencrypted input.

As for the 768 lines... has he tried with HDCP enabled card on PC and see what resolution is detected. Possibly the reported size is 768 because the driver treats it higher res than 1080i (which is effectively 540p).
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Old 05-02-07, 09:26 AM   #24
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Default Re: Linux + HDCP

Quote:
Originally Posted by krionius
He has a computer with non HDCP videocard, trying to push out big resolution video. It's cut down by the HDCP HDTV to lower resolution - (to clear up the TV asks for lower resolution and it receives such, so you cant set your output to such big resolution). Through DVI he is putting it through.
Thanks for the info. But by 'video' do you mean actual video or just the desktop? If video, what is pushing it - PowerDVD/WinDVD?

Sorry for all the questions, but I'm really curious. I'm with pranay here in that I don't believe that TVs reject unencrypted signals, so I'm asking all this to be really sure what's going on.
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