By default, you don’t need to license your Docker Trusted Registry. When installing DTR, it automatically starts using the same license file used on your Docker Universal Control Plane cluster.
However, there are some situations when you have to manually license your DTR installation:
Go to Docker Store and download your license.
Once you’ve downloaded the license file, you can apply it to your DTR installation. Navigate to the DTR web UI, and then go to the Settings page.
Click the Apply new license button, and upload your new license file.