Yes, it is. You do not have to pay us any royalties when distributing your applications developed with Elegant Ribbon to your customers.

When purchasing Elegant Ribbon, you get a license key. To disable the background window indicating that an evaluation copy of Elegant Ribbon is used, just specify the license key in your code [IMPORTANT] before the first use of the ribbon:

// First way
[C#]
private static void Main()
{
   Elegant.Ui.RibbonLicenser.LicenseKey =
      "XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX";
   Application.Run(new MainForm());
}

[VB.NET]
Private Shared Sub Main()
   Elegant.Ui.RibbonLicenser.LicenseKey = _
      "XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX"
   Application.Run(New MainForm())
End Sub

// Second way
[C#]
public class MainForm
{
   static MainForm()
   {
      Elegant.Ui.RibbonLicenser.LicenseKey = 
         "XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX";
   }
}

[VB.NET]
Public Class MainForm
   Shared Sub New()
      Elegant.Ui.RibbonLicenser.LicenseKey = _
         "XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX"
   End Sub
End Class