Hi all, I just noticed today that the EU's General Data Protection Regulation (their revision of earlier Data Protection Directive) calls for a "structured, commonly used, machine-readable and interoperable format" to transmit a subject's consensus from an operator to another. Let me quote the beginning of article 68: To further strengthen the control over his or her own data, where the processing of personal data is carried out by automated means, the data subject should also be allowed to receive personal data concerning him or her which he or she has provided to a controller in a structured, commonly used, machine-readable and interoperable format, and to transmit it to another controller. Data controllers should be encouraged to develop interoperable formats that enable data portability. http://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32016R0679 Who should devise and standardize such a format? Would that deserve a IETF WG? Ale -- I always wanted a consent-exchange Internet protocol for email users.