Our assemblies do not go to your account to check for a license because that would not be a good idea on a production server. Instead, the trial or licensed version is built right into the assembly itself.
Thus, there are trial versions of our assemblies that add the licensing message on your page on a random basis; and there are licensed versions of the assemblies that do not. This blog post will show you how to tell one from the other: http://blogs.telerik.com/aspnet-ajax/posts/12-03-28/getting-tired-of-seeing-trial-messages-in-your-asp-net-ajax-application.aspx.
Once you have purchased a licensed version, you should:
- uninstall the trial version from your machine
- delete the trial files (zip archives, the assemblies from your projects)
- update your projects to use the licensed assemblies: http://blogs.telerik.com/aspnet-ajax/posts/12-12-21/upgrade-the-version-of-your-telerik-asp.net-controls-in-6-easy-steps.
I hope this explains the case.
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