[wdmaudiodev] Re: Solution for MSVAD loopback interface
- From: Robert Bielik <robert.bielik@xxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 16 Dec 2010 08:59:53 +0100
Frank Yerrace skrev 2010-12-16 08:39:
"When Content that is marked with Copy Protection flows through Driver... The Driver
does not expose or transmit Content to any audio capture interface of the Driver or other
software."
Hmm... I handle a very similar situation, and where I do want to be able to
stream the content. How should I do in this case, should I mark the secondary
stream copy protected ? And how ?
TIA
/Rob
Frank Yerrace
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Roberts
Sent: Wednesday, December 15, 2010 3:02 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Solution for MSVAD loopback interface
Mike Kemp wrote:
Hi. This might be irrelevant or wrong, but I recall reading that as
part of digital rights management (DRM) enforcement Microsoft makes it
impossible to access audio from an output e.g. to route it to an
input, except in a suitably signed driver. I'd be interested to know if I'm
wrong here.
That's not exactly right, although you're on the right track.
For normal audio, there are no restrictions. If the audio is DRM protected,
the audio subsystem will simply refuse to play it if there is an unsigned
driver in the stack.
The protection mechanism doesn't work at a sufficiently fine-grained level to
do the kind of blocking you're talking about.
--
Tim Roberts, timr@xxxxxxxxx
Providenza& Boekelheide, Inc.
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