Your software can include all trial licenses or a combination of permanent and trial licenses.
Licenses that you purchase are permanent. Other software comes with trial licenses.
Trial licenses let you test features in the UI and perform some initial configurations before full purchase. Trial licenses typically last for 30 days after the installation time. You cannot copy or regenerate a trial license in the product.
If all of your licenses are trial licenses, including the core software license that includes the Web Portal feature, the software can lock out all users from accessing the UI when the trial expires.