This version of Unity is unsupported.
Method group is Obsolete

HolographicSettings.IsContentProtectionEnabled

Obsolete Support for built-in VR will be removed in Unity 2020.1. Please update to the new Unity XR Plugin System. More information about the new XR Plugin System can be found at https://docs.unity3d.com/2019.3/Documentation/Manual/XR.html. public static bool IsContentProtectionEnabled;

Description

Whether the app is displaying protected content.

When content protection is enabled, rendered content will be visible only in the headset, disabling the Mixed Reality Portal's preview.