[wdmaudiodev] Re: Solution for MSVAD loopback interface

  • From: Tim Roberts <timr@xxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Wed, 15 Dec 2010 15:02:00 -0800

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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