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Resolving TKL403 Licensing Warning for Telerik Document Processing
Updated on Jun 9, 2026
Environment
| Version | Product | Author |
|---|---|---|
| Q1 2026 | Telerik Document Processing | Desislava Yordanova |
Description
The TKL403 licensing warning occurs when using Telerik Document Processing Libraries version Q1 2026. The error states: "Services associated with Telerik Document Processing Libraries require a subscription or trial license. Please obtain a subscription license." This issue commonly arises when using one of the following NuGet packages:
Telerik.UI.for.Wpf.AllControlsUI.for.WinForms.AllControls
Both packages include references to the Telerik Document Processing Agent Tools. These AI tools require a subscription license, which is not covered under a perpetual license.
This knowledge base article also answers the following questions:
- How to resolve the
TKL403warning for Telerik Document Processing Libraries? - Why does Telerik Document Processing require a subscription license?
- How to fix licensing warnings for AI tools in Telerik Document Processing?
Solution
To resolve the TKL403 licensing warning, follow these steps:
- Check if the
Telerik.UI.for.Wpf.AllControlsorUI.for.WinForms.AllControlsNuGet package is in use. This package includes unnecessary dependencies like Telerik Document Processing Agent Tools, which require a subscription license. - If you use one of the combined packages, replace it with individual NuGet packages for the specific components in your project. This approach excludes the AI tools and prevents licensing warnings.
- If you need the AI tools, get a subscription license to remove the warning. For more information, see License Requirements.
- The generated documents do not display a watermark and your license for the core Telerik Document Processing libraries remains valid. The warnings do not indicate a license problem for the packages you actively use.
- If the warning persists, confirm that only relevant NuGet packages are installed and no unnecessary dependencies are included.