A: Yes, but you must apply for the DevExpress Community License program. It requires your OS project to be non-commercial and public.

// license.js import { LicenseManager } from 'devextreme/license'; // Paste your key here const licenseKey = 'DXv#-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX';

Then import this file any DevExtreme component is imported.

using DevExtreme.AspNet.Core; public void ConfigureServices(IServiceCollection services) { services.AddDevExtreme(licenseKey: "DXv#-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX"); } For build servers or CI/CD, DevExpress provides a command-line tool to register the key globally on a machine:

A: No. The validation is entirely offline. The LicenseManager performs a local cryptographic check. No network call is made, so your app works in air-gapped environments.

A: You likely forgot to set the environment variable on the production server, or you bundled the key only in a development config file.