All good points. Although one case I was thinking about, from a recent discussion on debian-legal, is if you want to hand out OpenOffice CD's or Knoppix CD's, as good publicity for free software.
Ideally you'd just like to tell anyone who asks: "Go to openoffice.org for the 1GB of source code." That relies on provision 3(c) of the GPL:
Accompany it with the information you received as to the offer to distribute corresponding source code.
But if you downloaded OpenOffice from openoffice.org, then you cannot rely on provision 3(c) because it is available only if you (a) are noncommerical, which you might be, and (b) if you received a written, three-year offer when you got the program, in accordance with your upstream source following provision 3(b). Openoffice.org, as far as I know, isn't providing such an offer. They (reasonably) just offer you source and binary on the same website, which is following provision 3(a).
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