we should have a message, in the attendee list of all our events (past, present and future) in the line of "This list is for the benefit of the participants and RIPE doesn't authorize to use it for marketing prospects or any other activities. We remind that GDPR requires explicit consent to use this data".
Sorry Jordi. I think this is worthless bullshit. There's no way to express this tactfully. These sorts of disclaimers are no different from the stupid legalese that gets appended to far too many corporate emails: "if you are not the intended recipient... blah, blah, blah". Spammers and marketing scum will pay no attention to your suggested disclaimer. And I very much doubt someone could successfully prosecute or sue whenever a breach has occurred on the basis of that disclaimer. If someone's violated GDPR, it'll make no difference whether or not this sort of disclaimer exists. I think we should concentrate on making sure our personal data are protected from mis-use rather than sticking up yet another warning notice on our front door. IMO we've already got too many of them. And, dubious virtue signalling aside, I'm not convinced they do any good. Has anyone got any evidence to show that warnings like the one above have actually reduced the volume of spam or made a marketroid behave properly? Until that evidence emerges, we should stop going down this path - and very probably stop this thread too.