Cognitive sovereignty: a definition

« Knowledge is the only matter that grows when shared. » This vision, which I hold, invites us to rethink sovereignty not in terms of borders, but as the capacity to control the value chain of knowledge — from its creation to its sharing, while guaranteeing its authenticity and its protection. But one must first know which sovereignty one is speaking of, for the word covers at least three distinct undertakings.

Sovereignty of algorithms: to develop and master one's own models so as not to depend exclusively on imported technology. The challenge is as financial as it is technical — even promising European startups often raise from foreign funds, which dilutes the very mastery they claim to build. Sovereignty of data: to guarantee that data remain under European control — and geographic localization does not suffice, since extraterritorial legal obligations such as the Cloud Act apply to an American host even on European soil. Sovereignty of infrastructure: to hold the complete ecosystem — data centres, compute, networks — without which the first two remain declarative.

These three tiers are necessary. They are not sufficient. For one can own one's models, one's data and one's servers, and have already ceded the essential: mastery of organizational reasoning itself. When all of an organization's people entrust their analyses, syntheses and decisions to one and the same external system, they converge toward a median style of thought, optimal according to a third party's training corpora. What is exported then is not a datum — it is the way of thinking. I call cognitive sovereignty this fourth tier: the capacity of an organization to preserve, on its own infrastructure and by its own rules, its singular way of reasoning — its cognitive phenotype — without extraction or homogenization by third parties.

An organization that does not control its reasoning capabilities is as vulnerable as one whose supply lines can be cut.

Cognitive sovereignty is the natural extension of what the GDPR and then the AI Act established for data: after the right to control what is known about you, the right to control how you think. It is not a retreat — AI technologies are global by nature, and must remain so. It is a demand of architecture: on-premise or sovereign-cloud deployment, auditability of processing, and knowledge that stays structured at its owner rather than diluted into a global model.

Postscript, June 2026. I wrote all this in 2024, before the present tensions, and the argument could seem theoretical. On June 12, 2026, one of the most widely used frontier models in the world was made inaccessible overnight, everywhere, on an export-control directive decided in the United States — with no notice and no recourse. Access was restored three weeks later. The demonstration is made, and it holds in one sentence: a reasoning capability whose switch a third party can flip is not an infrastructure — it is a revocable subscription.