Delete IKeyboard.cs and IMouse.cs interfaces. Not needed, as the MouseDevice and KeyboardDevice classes are sealed.

Source/OpenTK/Input/IKeyboard.cs

@@ -1,26 +0,0 @@
-#region --- License ---
-/* Copyright (c) 2007 Stefanos Apostolopoulos
- * See license.txt for license info
- */
-#endregion
-
-using System;
-
-namespace OpenTK.Input
-{
-    public interface IKeyboard : IInputDevice
-    {
-        bool this[Key k] { get; }
-        int NumberOfKeys { get; }
-        int NumberOfFunctionKeys { get; }
-        int NumberOfLeds { get; }
-        IntPtr DeviceID { get; }
-        bool KeyRepeat { get; set; }
-
-        event KeyDownEvent KeyDown;
-        event KeyUpEvent KeyUp;
-    }
-
-    public delegate void KeyDownEvent(IKeyboard sender, Key key);
-    public delegate void KeyUpEvent(IKeyboard sender, Key key);
-}

Source/OpenTK/Input/IMouse.cs

@@ -1,32 +0,0 @@
-#region --- License ---
-/* Copyright (c) 2006, 2007 Stefanos Apostolopoulos
- * See license.txt for license info
- */
-#endregion
-
-using System;
-using System.Collections.Generic;
-using System.Text;
-
-namespace OpenTK.Input
-{
-    public interface IMouse : IInputDevice
-    {
-        int NumberOfButtons { get; }
-        int NumberOfWheels { get; }
-        IntPtr DeviceID { get; }
-        int Wheel { get; }
-        int X { get; }
-        int Y { get; }
-        int XDelta { get; }
-        int YDelta { get; }
-
-        //event MouseMoveEvent Move;
-        event MouseButtonDownEvent ButtonDown;
-        event MouseButtonUpEvent ButtonUp;
-    }
-
-    public delegate void MouseMoveEvent(IMouse sender, MouseMoveData key);
-    public delegate void MouseButtonDownEvent(IMouse sender, MouseButton button);
-    public delegate void MouseButtonUpEvent(IMouse sender, MouseButton button);
-}