Proxmox VE Basic Subscription 2 CPUs/year

+ Access to Enterprise Repository
+ Stable software updates
+ Support via customer portal
+ Three support tickets
+ Response time within one business day

Subscription period is one year from purchase date. Each Proxmox VE server needs a subscription with the right CPU-socket count. All details on www.proxmox.com/en/downloads/item/proxmox-ve-subscription-agreement