Adobe has shifted all license sales to a model that is based on the annual count of two types of transactions: Submissions and Renditions.
Submissions are any forms – PDF, HTML or Adaptive Forms – that capture and submit data to any other system or store it in Adobe Experience Manager.
Renditions are any forms that are generated or created or updated inside Adobe Experience Manager for the purpose of PDF output, print output or fillable PDF (with no data submission).
The license pricing model uses the annual estimate for each of these types of transactions and calculates an annual price. Each year at the time of renewal, Adobe reviews the actual volume and adjusts the price for the next year based on the past and projected future usage.