ONLYOFFICE Docs Developer Edition v8.3.x -Production Server - Single Server 1 Year License - 1000 Simultaneous Document Connections

After your order has been processed, you will receive an email with your License Key and instructions on how to download your software, usually delivered within 1 business day.

The Production Server is for On Premise (Internal) Deployment. Licensed on an annual basis you will need to purchase a 1 Year Server License with the ammount of connections you will need each year.
A connection is a defined as a connection to a document.