Proxmox License Explained: AGPL v3, Subscriptions, and What It Means for You

Understanding the Proxmox License

Proxmox VE is released under the GNU Affero General Public License version 3 (AGPL v3). This is one of the strongest copyleft open-source licenses available, and it has specific implications for how you can use, modify, and distribute the software. If you are considering Proxmox for your environment, understanding this license is important.

What Is the AGPL v3?

The AGPL v3 is a free software license maintained by the Free Software Foundation. It grants you four fundamental freedoms:

• Freedom to use — Run the software for any purpose, including commercial production environments.
• Freedom to study — Access and examine the complete source code.
• Freedom to modify — Change the software to suit your needs.
• Freedom to distribute — Share the original or modified software with others.

The "Affero" aspect adds one important requirement beyond the standard GPL: if you modify Proxmox VE and provide it as a network service to others, you must make your modified source code available to those users. This closes the so-called "ASP loophole" that allows companies to modify GPL software and offer it as a service without sharing changes.

What This Means in Practice

For the vast majority of Proxmox users, the AGPL v3 license is straightforward:

• You can use Proxmox VE freely in production. There is no restriction on commercial use. Run it on as many servers as you want, host as many VMs as your hardware supports, and charge your customers for services built on top of it.
• You do not need to buy a subscription. The subscription is for support and the enterprise repository — it is not a software license. You are fully licensed to use Proxmox VE without paying anything.
• If you modify the source code, the AGPL applies. Your modifications must also be AGPL-licensed if you distribute them or provide them as a network service. If you only use modifications internally, you have no obligation to share the code.

Subscription Is Not a License

This is perhaps the most misunderstood aspect of Proxmox. The optional paid subscription does not grant you a software license — you already have one through the AGPL. What the subscription provides is:

• Access to the enterprise-stable package repository
• Direct technical support with guaranteed response times
• The Proxmox Customer Portal

You can verify this yourself. The subscription key is checked only for repository access and support portal authentication. It does not enable or disable any features in the software:

# Check subscription status
pvesubscription get

# Output for a system without subscription:
# status: notfound
# message: There is no subscription key
#
# The system is fully functional regardless of this status.

Can You Use Proxmox in Production Without Paying?

Yes, unequivocally. The AGPL v3 explicitly permits commercial and production use. Many hosting providers, enterprises, and service providers run Proxmox VE without subscriptions. There is nothing in the license that requires payment for production use.

That said, purchasing a subscription is a way to support continued development and to get professional help when you need it. Many organizations find that the peace of mind and time savings from vendor support more than justify the cost.

Comparison with VMware Licensing

The difference between Proxmox and VMware licensing models is dramatic:

Feature              | Proxmox VE           | VMware vSphere
---------------------|----------------------|----------------------
License cost         | Free (AGPL v3)       | Per-CPU subscription
Feature restrictions | None                 | Tiered (Standard/Enterprise/Enterprise Plus)
Source code access   | Full                 | None (proprietary)
Production use       | Free                 | Requires paid license
Clustering           | Free                 | Requires vCenter (additional cost)
API access           | Free                 | Included but license-dependent
Support              | Optional subscription| Included with license
Lock-in risk         | Low (open source)    | High (proprietary formats)

A mid-size VMware deployment with 4 two-socket servers could easily cost $20,000+ per year in licensing alone. The equivalent Proxmox deployment costs zero for software, with an optional $1,680 for Basic subscriptions (4 servers x 2 sockets x 105 EUR).

AGPL and Third-Party Tools

The AGPL license applies to Proxmox VE itself and its components. Third-party tools that interact with Proxmox through its REST API — such as Terraform providers, Ansible modules, monitoring integrations, or mobile management apps like ProxmoxR — are separate works and are not bound by the AGPL merely because they communicate with Proxmox over its API. This is an important distinction that enables a rich ecosystem of complementary tools.

Key Takeaways

The Proxmox licensing model is refreshingly simple. The software is free and open source under AGPL v3. You can use it for anything, anywhere, without paying. Subscriptions exist to fund development and provide professional support, not to unlock features. If you are coming from the VMware world, this is a fundamentally different and more permissive approach to virtualization licensing. Evaluate Proxmox on its technical merits, and know that licensing will never be a barrier to adoption.