M AND A AND COMPLIANCE

Open source risk and deal valuation.

Open source risk and deal valuation are linked more tightly than most deal teams assume. A target's dependency tree can carry license obligations and relicensing exposure that change what the business is worth. This article shows where that risk hides, how it moves a price, and how a buyer surfaces it while there is still room to negotiate.

When a buyer prices a software business, the model rests on revenue, margin, and the cost to keep the product running. Open source risk touches all three. A component that has relicensed to source available terms, or a copyleft obligation that conflicts with how the target ships, can require spend the seller never disclosed. Open source risk and deal valuation meet at that number. The question for the buyer is simple to state and hard to answer late: what will it cost to keep using this software safely after we own it.

Why open source moves a valuation

A valuation assumes the target can carry on as it is. Open source exposure breaks that assumption when a dependency carries terms the current operating model does not satisfy. Three patterns recur. A copyleft component, especially one under the GNU AGPL, sits inside a product the target ships or offers as a service, creating a source disclosure obligation. A source available project such as a Business Source License or Server Side Public License component runs in production under terms that restrict competitive use. Or the records are simply absent, so no one can say what governs the code at all. Each pattern converts into a cost: a commercial license, a migration, or a remediation project. That cost belongs in the model.

Where the exposure hides in a target

The exposure rarely sits where diligence looks first. Direct dependencies are usually documented. The risk lives deeper, in transitive dependencies, container base images, and components a single team adopted years ago and never revisited. A project that was open source when the target adopted it may have relicensed since. As of August 2023 HashiCorp moved Terraform, Vault, Consul, Nomad and Packer to the Business Source License 1.1. As of March 2024 Redis moved to a model that includes the Server Side Public License, with the community fork Valkey. Elasticsearch and Kibana moved to the Server Side Public License and the Elastic License in 2021, with the fork OpenSearch. MongoDB moved to the Server Side Public License in 2018. A target running any of these on an old assumption carries exposure the income statement does not show.

Turning exposure into a number the model can use

A red flag is not a valuation input. A priced remediation is. The work is to take each finding and attach a defensible cost and timeline: the list price of a commercial license against realistic usage, the engineering effort to migrate to a community fork, or the cost to remove a dependency entirely. The method is set out in quantifying open source risk for a deal. With numbers attached, the exposure stops being a vague concern and becomes a line a buyer can negotiate against, whether through a price adjustment, an escrow, or a condition to close.

Range, not false precision

Good diligence gives a range with stated assumptions, not a single confident figure. A commercial license cost depends on negotiation, and a migration cost depends on how deeply the component is wired in. Presenting a low and high case, each tied to a clear assumption, is more useful to a deal team than a single number that cannot survive a vendor conversation. It also keeps the analysis honest about what is known and what still needs confirmation.

Timing decides leverage

The same finding is worth far more early than late. Surfaced during diligence, an exposure can be priced into the offer or covered by an indemnity while the seller still wants the deal to close. Surfaced after close, it becomes the buyer's problem alone, paid out of the synergies the deal was supposed to deliver. This is why open source review belongs in the diligence workstream and not in post close integration. The cost of the review is trivial next to a single mispriced obligation. Relicensing risk in a specific target is treated further in relicensing exposure in an acquisition target.

What a buyer should ask for

Ask the target for a current software bill of materials, the license of every dependency including transitive ones, and evidence of how source available and copyleft components are handled in shipped or hosted products. Where records are thin, treat that gap as its own risk and build it into the range. A disciplined process for this work is laid out in the open source due diligence checklist, and the related risk of distribution obligations is covered in open source audit risk from distribution. For the broader program, the M and A and compliance pillar ties these workstreams together, and a buyer side open source M and A due diligence engagement runs the review so the number reaches the deal team in time to matter.

COMMON QUESTIONS

Questions buyers ask.

CONTAINMENT

Price the open source exposure before the deal closes.

A confidential open source M and A due diligence review. Independent, buyer side, paid only by you.

Not ready to talk? Read the free open source license risk guides first.