Bring Your Own License (BYOL)

Bring your own license, or BYOL, lets organizations move existing software licenses to the cloud. Many cloud services can be bought with the software license included in the price, for example a virtual machine running Windows Server or a managed database running a commercial database engine. With BYOL, the customer instead supplies its own license, purchased from the software vendor, and pays the cloud provider only for the infrastructure or a reduced service rate. Whether BYOL is allowed, and on what terms, depends on the software vendor's license rules.

BYOL can reduce costs significantly when an organization already owns licenses, for example after migrating workloads from its own data center. It also introduces licensing complexity, since vendors' rules for cloud deployment can be strict and differ between cloud providers. For IT financial management, BYOL decisions sit at the intersection of cloud cost management and software license management, and they require close cooperation between the FinOps team and software asset managers.

Definition of Bring Your Own License

Bring your own license is an arrangement in which software licenses acquired from a vendor are deployed on a cloud provider's infrastructure, in line with the vendor's license terms, rather than buying a license-included cloud service. The customer remains responsible for license compliance.

Microsoft's Azure Hybrid Benefit is a well-known example. Other software vendors, including database, operating system and enterprise application vendors, have their own rules for using their licenses in public clouds.

License Rules for the Cloud

Software vendors set the conditions under which their licenses can be used in the cloud. Some allow licenses to move freely between on-premises and cloud environments, often with active maintenance or Software Assurance. Others restrict cloud use to certain providers, require dedicated hardware or count cloud virtual CPUs differently from physical processors.

Some vendors treat certain cloud providers differently from others. For example, Microsoft has rules that limit how some licenses can be used on the shared infrastructure of specific large providers, which affects BYOL options there.

These rules change over time and differ between products, so organizations must check the current terms for each license before deploying it in the cloud.

Dedicated Hosts and Shared Infrastructure

Some licenses can be used on standard shared cloud instances, while others require dedicated hosts, physical servers reserved for a single customer, so that licensing can be based on physical cores.

Dedicated hosts give more control for licensing but are usually more expensive and less flexible than shared instances. The cost of the host must be weighed against the license savings.

Cloud providers offer tools to help track license use on dedicated hosts and to apply license rules automatically.

Importance of BYOL in IT Financial Management

Software licenses can represent a large part of the cost of running workloads in the cloud. BYOL can reduce that cost and allow organizations to reuse investments they have already made.

It also creates compliance risk if not managed carefully. The organization, not the cloud provider, is responsible for using its licenses correctly, and vendors can audit cloud deployments just as they audit on-premises ones.

For this reason, BYOL decisions should be made jointly by FinOps, procurement and software license management.

Cost Savings and Migration

When moving workloads from on premises, organizations often hold licenses that would otherwise go unused. Applying them in the cloud avoids paying again for the same software through license-included pricing.

BYOL also affects migration business cases. A comparison of on-premises and cloud costs should account for which licenses can be brought, which must be bought and what ongoing maintenance costs remain.

Over time, organizations may choose to move from BYOL to license-included pricing as licenses come up for renewal, if the cloud option offers better flexibility or value.

Compliance Risk

Deploying licenses in the cloud in ways the vendor does not permit can lead to significant findings in a software audit. Cloud deployments change quickly, so licenses that were compliant at migration can fall out of compliance as workloads scale or move.

Common issues include counting virtual CPUs incorrectly, running licenses on providers or infrastructure types the vendor does not allow, and failing to maintain the support or Software Assurance that cloud rights depend on.

Tracking where BYOL licenses are deployed, and on what infrastructure, is essential to managing this risk.