The 'Encodian PDF Converter for SharePoint Online' and 'Encodian Document Manager for Flow' products are licensed via subscription.
When you first install the application or request a trial licence you are automatically assigned a 'Free Trial' licence which is valid for 30 days. If after the 30 days period you have not opted to purchase a paid subscription, your tenant will be automatically assigned to the 'Free' licence.
Your subscription can be upgraded as required via the account portal, please submit a ticket or email firstname.lastname@example.org.
For further detailed information on the different subscription levels and standard pricing please visit our website.