Before PVP-OPM or PVP-UAB can be used, the operating system must verify whether a valid graphics subsystem is present, to avoid sending content to a hacker’s emulation device. The following are the stages of the authentication process:
1. The vendor-supplied driver must establish that it is talking to authentic and uniquely identifiable graphics hardware. It does this using Hardware Functionality Scan (HFS).
2. The operating system must establish that it talking with a valid and conformant vendor-supplied driver. It does this by checking that the driver has a valid certificate.
3. The operating system’s media environment also must prove its authenticity. The content’s interests are represented by an Input Trust Authority (ITA) module, which checks the authenticity of the media environment and the version number of its global revocation list, before allowing the content-delivery security to be removed.
Following sections explore HFS and the validation of the driver certificate.
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