The “Values and Policies of Personal Information” Chair of Institut Mines-Télécom (IMT) offers insight into the concept of digital identity. Digital identities, including both personal and sovereign identities, represent a major issue for society. The uses and regulation of these identities are changing rapidly in the midst of digital transformation. Given this context, the Values and Policies of Personal Information Chair has organized a series of multidisciplinary conferences with use cases to explore the legal, technical, economic and philosophical issues involved.