How to prevent user form record video and audio?

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C#

WPF

Hi I write media player with C# WPF. I want to block the Screen recorder so user can not capture my content.
I use this code for solve this problem:

[DllImport("user32.dll")]
        public static extern uint SetWindowDisplayAffinity(IntPtr hwnd, uint dwAffinity);
/////////////
 const uint WDA_MONITOR = 0x00000001;  
            IntPtr windowHandle = new WindowInteropHelper(Application.Current.MainWindow).Handle;
            SetWindowDisplayAffinity(windowHandle, WDA_MONITOR);

this code is worked and the video not recorded, But audio still capture. How can prevent the recorder program to capture audio too?
someone told me: "Blocking audio seems impossible, because there are a lot of methods to record audio (like wasapi)"
even if this is impossible, how can pause or stop my player after my code detected the recorder?

What I have tried:

[DllImport("user32.dll")]
        public static extern uint SetWindowDisplayAffinity(IntPtr hwnd, uint dwAffinity);
/////////////
 const uint WDA_MONITOR = 0x00000001;  
            IntPtr windowHandle = new WindowInteropHelper(Application.Current.MainWindow).Handle;
            SetWindowDisplayAffinity(windowHandle, WDA_MONITOR);