[wdmaudiodev] Re: Capturing audio output using a "kernel mode filter driver"

  • From: e-t172 <e-t172@xxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Mon, 23 May 2011 19:08:49 +0200

On 2011-05-23 19:05, Robert Bielik wrote:
e-t172 skrev 2011-05-23 18:52:
So you're completely right: it's impossible to do this using an sAPO
without Microsoft's blessing. They must be using some other technique
to access DRM protected audio.

But there is no way. Consider WaveRT driver model, there is no way to
get between rendering client and the device. So they must use a sAPO,
and gotten it
signed. For a sAPO that handles DRM protected content, yes you'd
probably need to go to WHQL to get the sAPO DLL signed. But all that it
takes
is for the sAPO to pass the tests required for a submission to WHQL
(which should be easy enough), then you're "home". Like.. you don't have
to "tell" the
tests that there is a "backdoor" in the sAPO that pipes out incoming
rendered audio... ;)

You're right. I guess the only way to know for sure would be to install the thing and look for new device entries or changes in the sAPO registrations. And check the signatures.

--
Etienne Dechamps / e-t172 - AKE Group
Phone: +33 6 23 42 24 82
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