understand your concern about copyright issues. To help you explore different ways of achieving similar goals, I will provide you with two alternative methods for creating a Windows overlay. These methods may not be as feature-rich as the provided WPF example, but they should give you a different starting point to create your overlay.

Using WinForms instead of WPF:
You can create an overlay using Windows Forms (WinForms) instead of WPF. This approach will give you a simpler, lightweight solution.

```csharp
using System;
using System.Drawing;
using System.Windows.Forms;

namespace WinFormsOverlaySample
{
    public class OverlayForm : Form
    {
        private Form _targetForm;

        public OverlayForm()
        {
            // Determine the target window
            _targetForm = Form.ActiveForm;

            // Set the overlay's location and size to match the target window
            Location = _targetForm.Location;
            Size = _targetForm.Size;

            // Make the overlay transparent
            BackColor = Color.Magenta;
            TransparencyKey = Color.Magenta;

            // Set the overlay's window style
            FormBorderStyle = FormBorderStyle.None;
            TopMost = true;

            // Handle target form events
            _targetForm.Resize += TargetForm_Resize;
            _targetForm.LocationChanged += TargetForm_LocationChanged;
        }

        private void TargetForm_LocationChanged(object sender, EventArgs e)
        {
            Location = _targetForm.Location;
        }

        private void TargetForm_Resize(object sender, EventArgs e)
        {
            Size = _targetForm.Size;
        }
    }
}

```
2. Using a borderless UserControl as an overlay within the target window:
Another approach is to create a borderless UserControl that acts as an overlay within the target window itself. This way, you don't need to manage a separate window for the overlay.

```csharp
using System;
using System.Drawing;
using System.Windows.Forms;

namespace UserControlOverlaySample
{
    public class OverlayControl : UserControl
    {
        public OverlayControl()
        {
            // Set the control's location and size to match the parent window
            Dock = DockStyle.Fill;

            // Make the control transparent
            BackColor = Color.Transparent;

            // Set the control's style
            SetStyle(ControlStyles.SupportsTransparentBackColor |
                     ControlStyles.OptimizedDoubleBuffer |
                     ControlStyles.AllPaintingInWmPaint |
                     ControlStyles.UserPaint, true);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            // Draw your overlay content here
            // e.Graphics.DrawLine(Pens.Red, 0, 0, Width, Height);
            // e.Graphics.DrawLine(Pens.Red, Width, 0, 0, Height);
        }
    }
}
```
With these alternative approaches, you can create a basic overlay with different technologies. Please note that you may still need to implement additional features like handling window resizing, updating the overlay's content, and responding to user interactions. The code samples provided should give you a starting point to build upon.
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