Some time ago the question was raised of what happens if you extract
data from an ODbL produced work that is under BY-SA.
The concern was that the resulting database would cause a conflict
between the ODbL and BY-SA as it would be a derivative both of the ODbL
database and of the BY-SA produced work, thereby triggering both
licences' mutually incompatible share-alike clauses.
I asked about this on the odc-discuss list. The answer is informative
and I recommend reading it in full:
http://lists.okfn.org/pipermail/odc-discuss/2010-August/000291.html
My understanding of the answer is that the data isn't what you are
licencing under BY-SA. You are licencing the originality/creativity
involved in making the produced work. So when you extract the data, you
have not extracted anything that is covered by BY-SA. Any database you
create as a result is therefore not covered by BY-SA, so the ODbL
applies without clashing. And the user knows this because of the ODbL
advertisement attached to the BY-SA work.
This is elegant but it took me a while to get my head around it. :-)
- Rob.
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