OPC Data Client uses its own licensing model, and not the common .NET licensing model for component and controls. This means that in Visual Studio, the designer will not create and maintain a file named licenses.licx, as with some other libraries.

When OPC Data Client runs inside the Visual Studio (such as when you are using it to design your screens using the Live Binding Model), it always looks for its license in the Registry License Store, which means that you need to install the license key for it the License Manager utility. Other methods for locating the license key, such as embedding it into your project using the Managed Resource License Store, are not applicable to the OPC Data Client code running inside the Visual Studio.