Maurizio, I agree with your analysis: the extension of Sec. 4.2's
obligations to "any Derivative Database" seems to make this a share-alike.
I suspect that this was missed when Sec. 4.4-4.7 were removed from ODbL to
create ODC-BY.

Some discussion going on about this in the web forum:

On Fri, Feb 10, 2017 at 2:14 AM Maurizio Napolitano <> wrote:

> I received an email from a lawyer who claims that the text of the
> ODB-BY license has a clause which falls under the concept of
> share-alike.
> But, according this schema, the license is not a SA
> The issue is related on this side of the text license
> “If You Publicly Convey this Database, any Derivative Database, or the
> Database as part of a Collective Database, then You must:
> a. Do so only under the terms of this License;” (followed by
> other conditions, but for this discussion only the first condition is
> relevant)
> [source:
> ]
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