The problem is DRM: if you set the HDMI-out as the default monitor on Windows, then the videos will play. Windows Media Player only lets video play on the primary monitor.
Why is this so difficult? This is copy protection in action. Large content production studios don't want you to steal (share) the video with other people. It's called Digital Rights Management, and it's a consumer nightmare.
As easy as it is to plug in an HDMI cable, DRM introduces another level of complexity that users should not have to deal with.
What's the worst part of DRM? It doesn't work. All you need to do is visit your favorite bit torrent website to confirm that hard fact.
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