Windows Media Digital Rights Management (DRM) has been part of the Windows ecosystem since before the beta release of Windows Media Player 7 in 2000. Windows users have millions of protected files that must play in this ecosystem. Therefore, we highly recommend that digital media renderers support Windows Media DRM-ND (NETMEDIA-0020).
Digital media renderer devices must meet two criteria:
DMR devices must not block during errors.
DMR devices must be ready to accept input.
The DMR might not be in the same room as the DMC. Therefore, when an error occurs, it is often the best user experience to move past the error and continue to play the next item. The Windows 7 logo requires that when a DMR receives an error, it must go into a STOPPED state and await instructions from the DMC. If the DMC provides another resource, then the DMR must suppress any error and begin playback of the next stream (NETMEDIA-0041).
When a DMR announces itself on the network, it must be able to display streams that are received from a DMC without any additional user input (NETMEDIA-0042). It is unacceptable for a device to announce itself as a DMR and then refuse to play back because the hardware is not set up to receive content. If the device has multiple modes and it can act as a DMR only in certain modes, then it must not broadcast itself as a DMR when in one of those competing modes.
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