Yes. Episerver is a licensed product.
Are you saying If I use Episerver paid license than this error message will not be shown.
Its just a license error warning.
Yes. I think you will get this message when your're using a developer license as well.
When I am using @Html.RequiredClientResources("Header") and @Html.RequiredClientResources("Footer") in my _root.cshtml layout file and after running the project on every page in page tilte its -NOT FOR COMMERCIAL USE message is display.
Is this error message is because of some license issue or there is some other reasons.