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Open-source license checklists can translate legal terms into repeatable release tasks—such as including copyright notices, license text, or a source offer—but they cannot decide every legal question or prove compliance on their own. At the Open Source Leadership Summit (OSLS) in 2019, Caren Kresse of Open Source Automation Development Lab (OSADL) presented a checklist approach for making those obligations explicit and evaluating potential license conflicts.
Why open-source software creates compliance work
Program code is protected by copyright. Copying or distributing it therefore requires permission, which a license grants subject to its terms. Open-source licenses provide broad freedoms, but they do not all impose the same conditions. A project that incorporates multiple components must account for every license that applies to the software it distributes, and assess whether the licenses can be complied with together—including any proprietary license involved.
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That work can be easy to overlook when teams treat “open source” as one uniform set of rules. The relevant tasks depend on the license, its version, how components are combined, and what the distributor provides. A checklist helps make the obligations visible; it does not make those differences disappear.
What OSADL’s checklist approach does
Kresse’s presentation proposed a canonical language to give reviewers a common way to express license obligations. It uses “YOU MUST” for an obligation and “YOU MUST NOT” for a prohibition, followed by an action and an object. For example, “YOU MUST Provide Copyright notice” makes a requirement more operational than a general reminder to “check the license.”
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The presentation illustrated this with BSD-2-Clause binary distribution. Its checklist rows call for providing copyright notices, the license text, and a warranty disclaimer in the documentation or other materials supplied with distribution. It also listed templates for acknowledgments, written offers, warranty disclaimers, and notices. These examples show how license language can be turned into delivery tasks; the exact tasks for a real release still depend on the component and distribution.
Can checklists prevent compliance mistakes?
They can help teams avoid omissions by turning obligations into reviewable actions and giving people a shared vocabulary. A checklist can also surface a prohibition or a missing delivery item earlier in a release workflow. But the OSLS presentation did not report controlled outcome measurements: it gives no figure for fewer violations, faster reviews, or improved compliance rates. The material demonstrates a structured method, not proof that checklists alone prevent mistakes.
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Coverage and maintenance matter. A checklist is useful only to the extent that it captures the licenses, versions, conditions, and use cases relevant to the release, and that someone can resolve ambiguity. It should support—not replace—license review, scanning, evidence collection, and accountable approval.
How to use a checklist in a release workflow
- Inventory the software. Record each component’s name, version, origin, and identified license. Include dependencies rather than limiting the inventory to code written by the release team.
- Establish what is being distributed. Determine how components are combined and what the release actually provides. For container images, Linux Foundation guidance emphasizes analyzing every image layer and identifying what is distributed and by whom.
- Map licenses to actions and prohibitions. Use a checklist to record concrete duties—such as providing notices or license text—and restrictions that affect the release.
- Evaluate compatibility and exceptions. Consider the interaction among all relevant licenses, how components are combined, and any additional terms. Escalate unclear clauses for competent legal or compliance review.
- Prepare distribution materials. Gather the applicable notices and license texts, and prepare source offers or source packages when required by the relevant license and distribution method.
- Scan, review, and retain evidence. Use scanning as one input to human review. Attach decisions and fulfillment evidence to the release record so the team can show what it checked and delivered.
- Repeat when software changes. Recheck upgrades and dependency changes: a new version or component can change the applicable license obligations.
- Assign ownership. Name the people responsible for interpreting ambiguous terms, approving decisions, maintaining policy, and updating the release record.
This sequence fits within a broader compliance program. OpenChain training describes program work that includes identification, tracking, review, fulfillment at distribution, policy, oversight, and training—not merely a final checklist at release time.
How to interpret license compatibility guidance
OSADL’s presentation defines compatibility in practical terms: whether obligations or prohibitions conflict. It offers broad heuristics, but they are decision aids rather than universal legal conclusions.
- Copyleft with copyleft: The presentation’s general guidance says copyleft licenses are not compatible with each other.
- Permissive with permissive: It describes permissive licenses as bilaterally compatible.
- Permissive with copyleft: It describes permissive licenses as unilaterally compatible with copyleft licenses.
- Exceptions and uncertain cases: An extra obligation in a permissive license can conflict with a copyleft license. The presentation also calls for individual analysis where a case is unclear or the copyleft status is questionable.
These categories do not settle a particular project’s legal position. License wording and version, the way components are linked or otherwise combined, the distribution method, and applicable jurisdiction can all matter. Treat a compatibility result as a prompt for review, especially where additional terms or unclear language are involved.
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What the 2019 project had established
OSADL’s presentation concluded that the Open Source License Obligations Checklists project had encoded obligations for 59 licenses and evaluated compatibility. The slides said the checklists were planned for public release under Creative Commons Zero v1.0 Universal (CC0-1.0); at the time, access was available on request by contacting OSADL. That is a historical status from 2019, not confirmation of current access, updates, or licensing terms.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesFor teams comparing checklist or compliance approaches, the useful questions are:
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- Coverage: Which licenses, versions, use cases, and obligations are represented?
- Clarity: Are requirements written as concrete MUST or MUST NOT actions?
- Compatibility logic: Does the method expose conflicts and exceptions, or only list licenses?
- Machine readability: Can the data feed scanners, inventories, tickets, or release gates?
- Workflow fit: Does it connect identification and review with notice preparation and distribution?
- Governance: Who interprets ambiguity, approves updates, and records decisions?
- Access and reuse: Is the data reusable, and under what license?
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