Multiple Session Copy Protection
The miniport driver of a device that has copy protection can optionally support multiple simultaneous copy protection sessions. To do so, the miniport driver should do the following:
Return a unique copy protection key in dwCPKey for each copy protection activation.
Keep copy protection enabled until all sessions have been temporarily turned off (through VP_CP_CMD_CHANGE) or deactivated (VP_CP_CMD_DEACTIVATE). For example, the miniport driver could increment or decrement a reference count every time copy protection is activated (VP_CP_CMD_ACTIVATE) or deactivated/turned off, disabling copy protection entirely only when the reference count is zero.
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