Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
This page documents a feature that will be supported with a different technical solution in future versions of Windows.
In the Microsoft Secure Audio Path (SAP) model, applications cannot modify protected music in any way. For example, when an application attempts to intercept a music signal, the signal sounds like random noise. As a result, applications that normally modify signals (such as an equalizer) cannot change the sound of the music.
Some applications merely view a music signal. For example, some applications display flashing lights in time with the music signal, but do not modify it. To accommodate applications that view signals, a small part of the music is decrypted and passed in clear form with the encrypted content. The resulting signal is very poor (worse than telephone quality) but can suffice for applications that view signals.
Related topics