📊 Full opportunity report: The 24% Rule: Why Most “Sovereign Cloud” Certifications Don’t Test Sovereignty on ThorstenMeyerAI.com — validation score, market gap, and execution plan.
TL;DR
Most cloud certifications focus on security practices, not legal sovereignty. The 24% ownership rule in SecNumCloud is unique in testing control, but many providers still remain subject to foreign law. This distinction impacts cloud procurement and sovereignty claims.
Most European ‘sovereign cloud’ certifications do not actually test whether a provider is legally subject to foreign government control, with the exception of France’s SecNumCloud framework, which uses a unique 24% ownership rule to assess sovereignty.
Certifications like ISO 27001, SOC 2, and BSI C5 primarily verify security practices such as access controls, encryption, and incident response. They do not address legal jurisdiction or government control over data. In contrast, SecNumCloud, issued by France’s ANSSI, includes a specific ownership cap: foreign companies must hold less than 24% ownership to qualify, directly testing sovereignty.
This ownership rule is arithmetic-based, making it straightforward to verify from a company’s cap table, and is designed to prevent foreign government influence. As of mid-2026, around a dozen providers, including OVHcloud and Scaleway, hold active SecNumCloud qualifications, which are mandatory for hosting sensitive French public-sector data.
Other certifications like BSI C5, while comprehensive in security controls, do not inherently address jurisdictional immunity, merely requiring disclosure of legal domicile and data location. AWS’s European Sovereign Cloud, certified with a C5 report, remains subject to US law despite its physical separation within the EU.
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.
Implications of the 24% Ownership Limit for Cloud Sovereignty
This analysis reveals that most certifications do not guarantee sovereignty, as they focus on security practices rather than legal control. The 24% ownership rule in SecNumCloud is a rare, measurable criterion directly testing whether a provider is immune from foreign legal influence. This distinction impacts procurement decisions, especially for sensitive data in regulated industries.
Understanding this difference helps organizations evaluate true sovereignty claims and avoid being misled by badges that do not address jurisdictional sovereignty. As more providers seek SecNumCloud qualification, the ownership rule may become a standard benchmark for sovereignty in cloud services.
European sovereign cloud certification
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Evolution of Sovereignty Testing in Cloud Certifications
Traditional security certifications like ISO 27001 and SOC 2 have long been used to verify security practices but do not address legal jurisdiction or sovereignty. European frameworks such as EUCS and BSI C5 focus on controls and disclosure but do not prevent foreign legal reach. France’s SecNumCloud, introduced in 2016 and now at version 3.2, stands out by incorporating a specific ownership threshold—24%—to directly test sovereignty.
This framework was created in response to concerns about foreign influence and extraterritorial laws like the US CLOUD Act. It requires providers to be physically and legally within the EU, with data stored locally, and to have audited control over encryption keys and ownership structures. The ownership cap is a key element, making SecNumCloud a unique hybrid of security and sovereignty testing.
Despite the proliferation of security badges, the industry has yet to develop a comprehensive, universally accepted measure of sovereignty. The 24% rule remains the only arithmetic, checkable test of legal control, and its adoption is growing among providers serving sensitive European sectors.
“Achieving ISO 27001 is a 1 on the complexity scale, but SecNumCloud is a 10—it’s a very high bar for sovereignty.”
— Scalingo CEO
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Unresolved Questions About Sovereignty Certification Effectiveness
It remains unclear how many providers will fully comply with the ownership cap in practice, or how enforcement will be monitored over time. The impact of the rule on foreign-controlled providers operating within the EU is still evolving, and whether other frameworks will adopt similar measures is uncertain.
Additionally, the extent to which certification guarantees immunity from foreign laws like the CLOUD Act, despite ownership restrictions, is still debated among legal experts.
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Future Developments in Sovereignty Certification Standards
Expect increased adoption of SecNumCloud by providers aiming to serve sensitive public sector data in France and Europe. Regulatory agencies may tighten ownership limits or introduce new criteria to enhance sovereignty testing. Meanwhile, other European countries might develop similar frameworks, potentially leading to a broader shift in sovereignty verification standards for cloud services.
Organizations should monitor certification updates and legal developments to ensure compliance and sovereignty in their cloud strategies.
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Key Questions
What makes SecNumCloud different from other certifications?
SecNumCloud includes a specific ownership cap—24%—which directly tests whether a provider is under foreign control, unlike other certifications that focus solely on security practices.
Does a security certification guarantee sovereignty?
No. Certifications like ISO 27001 or BSI C5 verify security controls but do not address legal jurisdiction or control, which is what sovereignty testing requires.
Can foreign companies qualify for SecNumCloud?
Only if they meet the ownership threshold of less than 24% foreign ownership and comply with other legal and operational requirements set by ANSSI.
Will other European countries adopt similar sovereignty tests?
It remains uncertain. France’s approach is unique, but increasing concerns about foreign influence may inspire similar frameworks elsewhere in Europe.
What is the significance of the 24% ownership rule?
It provides a clear, arithmetic-based measure of legal sovereignty, making it a practical tool for verifying control and immunity from foreign government influence.
Source: ThorstenMeyerAI.com
