![]() ![]() Even analog TV-style outputs typically require some restrictions, provided by mechanisms such as Macrovision and CGMS-A. For DRM content, digital outputs such as Digital Visual Interface (DVI) and High Definition Multimedia Interface ( HDMI) will have High-bandwidth Digital Content Protection (HDCP) enabled, to prevent someone from recording the digital stream. These restrictions concern the various outputs from the PC. The protected environment is implemented completely in software, so software-based attacks such as patching the Windows kernel are possible. If an unverified component is detected, then Vista will stop playing DRM content, rather than risk having the content copied. In order to prevent users from copying DRM content, Windows Vista provides process isolation and continually monitors what kernel-mode software is loaded. It provides a "wall" against outside copying, where within the walls, content can be processed without making the content available to unapproved software. The protected environment also provides all the necessary support for Microsoft-approved ( signed) third-party software modules to be added. ![]() The protected environment in which DRM content is played contains the media components that play DRM content, so the application only needs to provide remote control (play, rewind, pause, and so on), rather than having to handle unprotected content data. ![]()
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