In addition to the technologies listed above, Windows XP offers improved support for Digital Rights Management (DRM), which allows content providers such as artists and record companies to protect their proprietary music or other data, by encrypting digital content and attaching usage rules to it. These rules determine restrictions such as the number of times content plays and the type of devices that can play it. Using Windows XP, you can ensure that a device or driver is trusted not to violate usage rules or allow a user to circumvent security. Trusted drivers are only relevant to DRM content that requires this security.
Driver modules that handle the audio content must include a DRM signature before they can render protected content that requires a trusted audio device. Windows XP uses a DRM signature in the driver's catalog files to identify a trusted device. To play DRM-encrypted content requiring a trusted audio device, WDM audio drivers and any associated filter components must be DRM-compliant. All audio drivers included in Windows XP are DRM-compliant.
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