Noel,
... but one objected strongly to any of his posts being transferred,
claiming copyright, and said if we did transfer them he would issue a
DMCA takedown notice on io groups.
There's one in every crowd.
We decided it was not worth the risk of trying to transfer postings -
even if we had been able to filter out postings from that person
someone else might later have objected.
I Am Not A Lawyer, but - so what?
As a matter of courtesy to objecting members I would probably delete their messages after the transfer. Or if there's too many of them inquire about a way to do that in bulk.
But as to DMCA threats...
My understanding of the DMCA safe harbor provisions is that curing such a notice is as simple as deleting the messages. Too, if your group's messages are not public I'm not sure that DMCA even applies; but that's a subtlety where a lawyer might have a field day.
Mark did give some consideration to this topic when first setting up the group transfer process. His conclusion was that he'd handle the DCMA take-down notices if and when they happen.
Shal
Shal Farley