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Weblog:   MS DRM is pure smoke
Subject:   re-encode == LOSS of quality
Date:   2003-07-15 16:10:16
From:   lucas_gonze
Response to: re-encode == LOSS of quality

There are two reasons to believe this isn't a lossy re-encoding. One, the way that WM9 works is that your code is inserted into a set of filters, and you have access to just about anything given that you insert yourself in the right spot. (That's based on limited understanding -- I'm a newbie with WM9 development). Two, WM9 DRM hackers are taking this seriously. So the most likely situation is that you can get access to highest-resolution bits available.


On the other hand, I'm having a hard time finding details of the crack. The WM9 folks have decided I'm a script kiddie, and the AVSForums search is not the greatest, so I'm stuck crawling AVSForums manually.

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Showing messages 1 through 5 of 5.

  • re-encode == LOSS of quality
    2003-07-22 09:58:55  anonymous2 [View]

    The tool being used is GraphEdit, a part of Microsoft's SDK for DirectShow.

    It show's the underlying encoders/decoders/stream splitters used to get from a file to an output device such as a soundcard, your monitor, or (and this is the 'crack' bit) another encoder's input and a subsequent file.

    It generally is lossy, because you are reencoding the decoded stream = generational loss.

    But it's possible that the bits could be caught before decoding, and shunted into a custom-written filter that instead of decoding the bitstream, just writes it to a file after decryption.
    • re-encode == LOSS of quality
      2003-07-22 14:33:06  anonymous2 [View]

      Does this apply equally to video, or to audio only?
    • Pathetic
      2003-07-22 13:58:12  anonymous2 [View]

      Try connecting the Line Out of your soundcard back to the Line In of the same PC... poof, no DRM!

      You're just doing exactly the same thing in software... next time try catching the stream before it hits the audio renderer and we'll have something to talk about.
    • Lucas Gonze photo re-encode == LOSS of quality
      2003-07-22 10:07:11  Lucas Gonze | O'Reilly Author [View]

      Anonymous, you are the rockest man alive. Huge props to you.
      • re-encode == LOSS of quality
        2005-04-11 04:54:22  ccnz2 [View]

        im trying to use graphedit with a .wmv file....
        basically even though i have it saved on my hard drive whenever it opens in media player it acquires the licence everytime i play it.
        I downloaded it from a sports site that shows games footage and think it is rubbish that you cant open it or save it without it doing this.
        Its sports clips not a damn feature film DVD!! this licensing media is a joke...i thought my subscription paid for my rights to the file but obviously not.anyone know of a easy way round this?
Showing messages 1 through 5 of 5.