Well, right now it's still technically illegal to download them, unless & until Springer actually says some different license. Not that anyone would be prosecuted, obviously; one could clearly claim that it was obvious that Springer intended to distribute them at the very least for personal non-commercial use, even if Springer didn't say so explicitly anywhere. If the terms are even more liberal than that, so much the better... But it ain't so till Springer says it's so :-).