Hi there, first of all, many thanks to Noritada-san and Kinoshita-san for bugreport and analysis.
Just for the record, currently I'm drafting a letter to upstream. I'm going to ask for a retroactive license change/upgrade to CC by-sa 3.0, so that this problem can hopefully be resolved for Etch as well. However, I feel rather uncomfortable at this as I don't trust my ability to express this correctly, so any help will be greatly appreciated. Furthermore, spare time is a scarce resource at the moment, so please don't hold your breath till I cough up something ... Cheers, Flo
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