Max Tegmark (MIT, Future of Life Institute) and Juan Benet explore how powerful AI and surveillance technologies could enable authoritarian control at civilisational scale — and what technical and institutional interventions can prevent it. Tegmark draws on his AI safety research and work with the Future of Life Institute to argue that open, privacy-preserving, decentralised infrastructure is a prerequisite for preserving human agency in an AI-enabled world. Direct and practical on the connection between cryptography, open protocols, and the defense of democratic freedoms.