Digital License Manager comes with an option to mask/obscure the license keys on the public facing pages like the Order Confirmation page which is available in public and can be abused.
Enable the feature
To turn on this functionality, go to License Manager > WooCommerce and check the option called “Obscure licenses“
How it works
Once the above option is enabled, the license keys will be masked with stars on the WooCommerce order confirmation page as follows: