Digital Audio Protection

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This paper includes information about Windows Media Center capabilities in Windows Vista Home Premium and Windows Vista Ultimate editions. It provides guidelines for independent hardware vendors (IHVs) to enable and disable two standardized, hardware- content access technologies in response to requests from Windows Media Center.

This paper defines a temporary mechanism for an audio device driver stack to provide access to these two digital audio output protections. The solutions in this paper define I/O control (IOCTL) codes and class IDs that are necessary to implement High-Bandwidth Digital Content Protection (HDCP) over High-Definition Multimedia Interface (HDMI), as well as Serial Copy Management System (SCMS) protection over Sony/Philips Digital Interconnect Format (SPDIF) for the Windows Vista Media Center Feature Pack 2008 release. These solutions are specific to this release and should not be used for any other Windows audio content access control scenarios or by third-party media playback applications.

This information applies only for the Windows Vista Media Center Feature Pack 2008 release and will be deprecated in future Windows releases.

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