Access seems to have been cut off about 2 hours ago. Presumably this was a mistake, but new-year optimists might hope that Springer did this on purpose, to gauge the market at low cost. As someone with a full-time job, I'd be happy to pay $10 to $20 to download an old book that might come in handy, but with conventional download costs being half the paper cost, I balk and just walk over to the university library so I…
> Thank you for reaching out to us. From time to time our titles may become available to the public for legal download. There is no guarantee that titles available will remain available permanently. The only titles that will remain available are titles marked as Open Access.
Thus, it sounds like what happened was an accident or publicity stunt. I expect access to remain cut off.