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Hi Dave!

Some great work there!

On 07/12/16 03:33, Dave Corley wrote:
> I've received clarification that while the CC-BY 4.0 license is
> not suitable for merging with OSM

Not quite. The problem is that CC-BY 4.0 on it's own is vague and may
or may not be suitable for OSM.

It's the "attribution" requirement. Section 3(a)(1)(A) of the CC-BY
4.0 licence[1] covers that and says that you need to attribute them
"in any reasonable manner requested by the Licensor". So the Licensor
is allowed pick how you attribute them.

If someone were to say "You have to put my/our name on every map you
make based on that" that would be a problem for OSM. (a) It's wildly
impractical because there's be thousands of them on every little map
and (b) the OSM licence doesn't/can't require that users-of-OSM have
to do that, so it's not even something "we" can require.

If someone were to say "Yeah, the OSM Contributors wikipage[2] is
totally fine for the BY requirement!" then we'd be all set for OSM usage!

In a way, just saying "It's CC-BY!" isn't really open data, since it
leaves some important conditions unset. However most users of CC data
(e.g. films, art) don't have this problem.

However, I think we're golden, because the data.gov.ie licence page[3]
says if using data from many people you can link to a page which lists
the data.gov.ie/etc attribution. OSM has ~1 million contributiors (so
that's the "multiple sources" covered), and you have to link to the
OSM copyright page[4] which links to the OSM Contributors page[2].

So according to the data.gov.ie, and OSM licence, we can import
data.gov.ie CC-BY 4.0 stuff into OSM! \o/

Now if OSM were to change it's licence again, we might be in problem.
But no-one wants to go through that again. But that hasn't stopped
anyone before.

So.... thanks Dave, but looks like it was all OK from the start. Ah
well, at least they know about us.

> the granting of explicit permission to use CC-BY 4.0 datasets by
> the relevant owner is allowed.

In theory, this is true of any closed dataset. Anyone can say "100%
closed copyright, all rights reserved, except OSM, yous can trace".
Just like the Bing aerial imagery.


[1] https://creativecommons.org/licenses/by/4.0/legalcode
[2] https://wiki.openstreetmap.org/wiki/Contributors
[3] https://data.gov.ie/licence
[4] https://www.openstreetmap.org/copyright

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