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TL;DR
Most industry certifications focus on security practices but do not address legal sovereignty issues. The French SecNumCloud framework introduces a unique ownership test, highlighting gaps in existing standards. This impacts data control and jurisdiction in AI and cloud services.
European cybersecurity frameworks are shifting focus from traditional security controls to legal sovereignty, exemplified by France’s SecNumCloud framework, which uniquely tests ownership control through a numerical cap. This development underscores a critical gap in existing certifications, which mainly verify security practices rather than legal control.
Current certifications such as ISO 27001, SOC 2, and BSI C5 primarily assess operational security controls—access management, encryption, incident response—aiming to verify security practices. However, they do not address the legal jurisdiction or sovereignty of data, leaving gaps in legal control, especially in cross-border contexts.
In contrast, SecNumCloud, issued by France’s ANSSI, introduces a numerical ownership cap—24%—that explicitly tests who ultimately controls the cloud provider. This requirement ensures data sovereignty by limiting foreign ownership, making it a legal sovereignty test rather than a security certification. As of mid-2026, about ten providers hold active SecNumCloud qualifications, including OVHcloud and Scaleway, with more in progress.
Meanwhile, BSI C5 incorporates jurisdiction disclosures but does not mandate immunity from extraterritorial laws like the CLOUD Act. Both standards can coexist, but SecNumCloud’s ownership test marks a significant evolution toward sovereignty-aware certifications.
The 24% rule: why most “sovereign cloud” certifications don’t test sovereignty
ISO 27001. SOC 2. BSI C5. Gaia-X. Every badge real, audited, correctly displayed — and not one answers the question that decides the deal: can a foreign government compel your data? Exactly one European framework tests that. It does it with a number.
C5 does cover place of jurisdiction, data location & disclosure obligations. It requires you to declare which law reaches you. C5 tells you the gun is in the room.
Requires that no non-EU law can reach you at all — enforced by the ownership cap. SecNumCloud requires there be no gun. That’s the whole difference.
The proposed Cloud and AI Development Act (COM(2026) 502) would set four Union assurance levels for public procurement. Its own recitals concede the point: Cybersecurity Act certification “is not suited for addressing sovereignty concerns.” National labels won’t be banned — but a SecNumCloud provider would still need separate Article 17 recognition. If it passes, the badge on the vendor’s website stops mattering and the assurance level starts. Meanwhile ANSSI + BSI have jointly committed to common criteria specifying where failure is disqualifying.
Microsoft showed the gap better than any critic: May 2025 — encryption makes access “technically impossible.” One month later — cannot guarantee immunity from US authorities. Thirty days between the marketing and the law. SecNumCloud doesn’t ban American technology — it forces a change of control over it (hence S3NS = Thales+Google, Bleu = Capgemini+Orange on Azure). Is it also protectionism? Partly, yes — and that critique is exactly why EUCS High+ died. Both things are true. Don’t ask if a provider is “sovereign” — the word has been marketed into meaninglessness. Ask the arithmetic: who owns you, and what law reaches you? Then check whether the answer is above or below 24% — including for the European champions nobody has asked.
Legal Sovereignty as a Certification Criterion
This shift matters because security certifications alone do not guarantee legal control over data. The introduction of sovereignty tests like SecNumCloud’s ownership cap emphasizes the importance of jurisdictional control in cloud and AI services, especially for sensitive government and critical infrastructure data. It highlights a growing recognition that legal sovereignty is as vital as technical security in data governance, impacting how organizations select and trust cloud providers.
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Limitations of Traditional Security Certifications
Most existing standards—ISO 27001, SOC 2, BSI C5—have been designed to verify security practices within operational boundaries, not legal jurisdiction. They focus on controls like encryption, access, and incident response, but do not address who ultimately controls the data or the legal environment. This gap has become more apparent as European regulators push for sovereignty measures, with France’s SecNumCloud leading the way by incorporating a numerical ownership threshold.
Historically, U.S.-based cloud providers like AWS and Microsoft have held numerous certifications but remain subject to U.S. law, such as the CLOUD Act. Their certifications do not alter jurisdictional control, prompting European regulators to develop standards that explicitly test ownership and control.
“SecNumCloud is a government-backed qualification that explicitly tests ownership and sovereignty, not just security controls.”
— Anssi official
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Unresolved Questions on Certification Effectiveness
It is still unclear how widely SecNumCloud will be adopted outside France, and whether other European countries will develop similar sovereignty tests. Additionally, the impact of these standards on international cloud providers, particularly U.S.-based firms, remains uncertain, especially regarding legal jurisdiction and compliance complexities.
Furthermore, the effectiveness of ownership caps in preventing foreign control in practice has yet to be fully evaluated, and whether this approach can be scaled across different jurisdictions is still under discussion.
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Next Steps in Sovereignty Certification Development
Expect continued expansion of sovereignty-focused standards like SecNumCloud within Europe, potentially influencing global certification practices. More providers are likely to pursue SecNumCloud qualifications as French regulations mandate its use for sensitive public-sector data. Additionally, other European nations may develop similar frameworks, emphasizing legal control alongside security.
Regulatory agencies and industry stakeholders will monitor how these standards influence provider behavior, data governance, and cross-border data flows, shaping the future landscape of AI and cloud sovereignty.
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Key Questions
How does SecNumCloud differ from traditional security certifications?
SecNumCloud explicitly tests ownership control through a numerical cap on foreign ownership—24%—making it a sovereignty test. Traditional certifications focus on security practices without addressing legal jurisdiction or control.
Can a provider with SecNumCloud certification still be subject to U.S. law?
Yes. SecNumCloud certifies legal sovereignty within the EU, but providers like AWS remain subject to U.S. laws such as the CLOUD Act, regardless of certification.
Will SecNumCloud become a standard across Europe?
It is likely to influence European cloud sovereignty policies, especially as France mandates it for sensitive data and pushes for broader adoption in critical sectors. Other countries may develop similar standards.
What challenges exist in implementing ownership caps?
Ownership caps require detailed ownership transparency and can be difficult to enforce across complex corporate structures. Scaling this approach internationally may face legal and operational hurdles.
Does certification guarantee immunity from jurisdictional laws?
No. Certifications like SecNumCloud confirm compliance with sovereignty criteria but do not exempt providers from applicable laws, especially extraterritorial ones like the CLOUD Act.
Source: ThorstenMeyerAI.com
