if the takedown is genuine (which it may well be), then as the copyright holders, it is their right. We generally try to get permission for as much of the published material as possible, but it isn't always possible for every single added entry (like trying to get permission for every scan used on HOL)
Still interesting (and unfortunate imho) the approach they took. Certainly doesn't put them in a particularly good light, but then again I suppose any publicity is good publicity, so I guess I might be helping them!
Any legal experts here who can tell me if the 150 euro demand is legal? I'minclined to wait for them to take me to court (if they do). By taking the files offline as soon as it was brought to my attention, surely I have done as much as I can ?