[wdmaudiodev] Re: Solution for MSVAD loopback interface
- From: Frank Yerrace <Frank.Yerrace@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 16 Dec 2010 07:39:51 +0000
Note however that if the driver is handling a stream that is identified as
copy-protected through this DRM property, the driver is obligated to disable
any sort of signal path that enables capture of the rendered signal. The text
from
https://winqual.microsoft.com/member/LAC/DocumentDetails.aspx?id=1024&type=0
reads:
"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."
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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