David Gerard a écrit :
So the problem here is that the euroskeptic opponent thinks this is ESA's problem, and that ESA feels it has to go along with this idea. That is: the problem you're describing is local politics rather than that open content licences are problematic.
What ill effects have befallen NASA from its works being public domain? I still eagerly await your and ESA's answers to this question.
NASA and ESA operate in different political and legal climates. That's a fact of life. Telling people that in order to do business with you they'd have to transform their legal and institutional framework, straight up front, is a sure road to disaster.
Bah. I'm proposing them CC-BY-SA as a solution. Though the license is deemed "free", the -SA clause probably precludes most uses in advertisement. (If it's not sufficient, I'll propose GFDL, which we consider "free" even though it de facto prohibits many uses, e.g. postcards.)