Script License File: Frequently Asked Questions

This article lists the answers to the most frequently asked questions (FAQs) about working with the Kendo UI for jQuery license key.

Does the license key expire?

Yes, the license key expires at the end of your support subscription:

• For trial users, this is at the end of your 30-day trial.
• For licensed developers, this is when your subscription expires.

You will need to obtain and install a new license key after starting a trial, renewing a license, or upgrading a license.

An expired perpetual license key is valid for all Kendo UI for jQuery versions which are published before its expiration date.

Will the product function with an expired license key?

This depends on your license:

• Perpetual licenses will continue to function normally with an expired license key. However, the following will happen if you update or install a package version that is released after the expiration date of the license:
  • A watermark will appear over selected Kendo UI for jQuery components.
  • A licensing banner will pop over a page that uses unlicensed Kendo UI for jQuery components.
  • A warning message will appear when calling the kendo-ui-license activate command.
  • A warning message will appear in the browser console.
• Subscription licenses will continue to function normally for deployed applications. However, the following will happen when you try to rebuild the application:
  • A warning message will appear when calling the kendo-ui-license activate command.
• Trial licenses will continue to function normally with an expired license key. The following will happen if you try to build or run the application:
  • A watermark appears on application startup.
  • A modal dialog appears on application startup.
  • A warning message will appear when calling the kendo-ui-license activate command.
  • A warning message similar to the following is logged in the build log.

See the Invalid License section for more information.

I updated the version of the Kendo UI for jQuery packages in my project and the invalid license errors have appeared. What is the cause for this behavior?

The most likely cause is that the newly installed Kendo UI for jQuery Components were released after the expiration date of your current license. To fix this issue:

1. Download a new license key.
2. Activate the new license key in your project.

Can I use the same license key in multiple builds?

You can use your personal license key in multiple pipelines, builds, and environments. However, each individual developer must use a unique personal license key.

Do I need an Internet connection to activate the license?

No, the license activation and validation are performed entirely offline.

Do I have to add the license key to source control?

No, you do not have to add the telerik-license.txt license key file or its contents to source control.

Build servers have to use the TELERIK_LICENSE environment variable as previously described.

Do not store the license key in plaintext, for example, in a GitHub Actions Workflow definition.

Is it possible to activate the license without executing commands?

Yes, if present, the license will be activated automatically during package installation. This applies to both the license key files and the environment variable. A diagnostic message will be printed in the npm install log.

Using the kendo-ui-license activate command is optional, but recommended in builds as it will return an error if the activation fails.

What happens if both the environment variable and the license key file are present?

If both the TELERIK_LICENSE environment variable and the telerik-license.txt file are present, then the environment variable will be used.

To enforce the use of the license key file, unset the environment variable.

My team has more than one licensed developer. Which key do we have to use?

To activate Kendo UI for jQuery you can use any of the keys associated with your subscriptions.

What happens if the developer who generated the license file leaves my company?

This doesn’t affect your license file. The license file is generated against a specific range of versions and it will be valid as long as the license code is valid for the product version you are using (that is, you need to change the license file only when you upgrade Kendo UI for jQuery).

Which versions of Kendo UI for jQuery require a license file?

Using any of the Kendo UI for jQuery components distributed through the following channels requires you to add valid license file to your application:

Distribution channel	Version
Kendo CDN (kendo.cdn.telerik.com and cdn.kendostatic.com)	version R3 2022 and later
NPM packages (@progress/kendo-ui)	version R2 2022 and later
Trial installation bundle	version R3 2023 and later
KendoUIProfessional.Trial NuGet package	version R3 2023 and later

Are earlier versions of Kendo UI for jQuery affected?

No, if you use CDN and Kendo UI for jQuery versions released prior to R3 2022 or NPM versions released prior to R2 2022, you don’t need to set up the licensing.

Do not include a license file when using Kendo UI versions prior to R3 2022. Including a license file with those versions will cause a KendoLicensing is not defined error.

Will the product function without a license file?

Yes, the product will continue to function without a license file. However, a warning message will appear in the browser console if a valid license file is not present. In addition, any pages that contain unlicensed Kendo UI components will receive a banner and select UI components will have a watermark.

I have a KendoLicensing is not defined error in the console. What should I do?

If you are using Kendo UI versions after R3 2022 and loading the required scrips asynchronously you need to properly chain the scrips loading order. loadScript is an async method and thus it does not reassure that the kendo.all.min.js is loaded before loading the kendo-ui-license.js.

      Promise.all([
        loadScript(this, ScriptsPath + '/jquery-3.7.0.min.js'),
        loadScript(this, ScriptsPath + '/kendo.all.min.js'),
        loadStyle(this, StylesPath + '/jquery-ui.min.css'),
        loadStyle(this, StylesPath + '/Kendo.css'),
        loadStyle(this, StylesPath + '/kendo.common.min.css'),
      ])
        .then(() => {
        loadScript(this, ScriptsPath + '/kendo-ui-license.js').then(() => {
          console.log('Files loaded');
          this.scriptsLoaded = true; 
        });
      })
        .catch(error => {
        console.error('Error loading KendoUI', error);
      });