This license type has a lifetime validity and contains by default the Update and Support Packet (USP), which is only valid for the purchased version.
This means, that after the one-time license purchase no additional costs are incurred and all updates for the purchased version are automatically included.
This means, that the subscription costs are incurred every month, but the subscription can always be terminated at the end of the month. In addition, during the subscription period you will receive not only all updates for the current version, but also the latest PaperOffice program versions after the release for free via the automatic update function.
The Buy and Subscribe Overview can be found at
Price and cost overview