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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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  • re-encode == LOSS of quality
    2003-07-22 09:58:55  anonymous2 [Reply | 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.
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