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Content protected video does not play on Mac while DisplayLink screens are connected

When DisplayLink screens are connected some protected content in iTunes and other applications may not play.

This is due to the behaviour of the OS X interfaces the DisplayLink driver uses to access graphics content. A side effect of those interfaces is that as soon as one DisplayLink screen is connected, protected content becomes unavailable on all screens.

A workaround is to temporarily disconnect all DisplayLink screens to access protected content.

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