I have asked on the odc-discuss mailing list about how the share-alike of the ODbL interacts with the share-alike of BY-SA:

http://lists.okfn.org/pipermail/odc-discuss/2010-July/000275.html

Short answer: There is no problem.

Long Answer: ODbL 1.0 clause 4.6 doesn't cover other people using the Produced Work and so it *doesn't* interact with BY-SA 3.0 Generic 8e . And the content of the OSM database will be covered by DbCL 1.0, clause 2.1 of which means that the Produced Work *can* be placed under BY-SA .

One thing that might cause confusion is that both the ODbL and BY-SA talk about "You". But each defines "You" separately and differently. The "You" of the ODbL is very specifically the person (or organization) using the data, *not* the "You" of BY-SA who is using the Produced Work.

I will ask odc-discuss about the implications of databases of information extracted from BY-SA Produced Works next.

- Rob.

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