[OSM-talk] Implications of using aggregated/statistical data from both licenses (ODbL and CC-by-SA) for OSMdoc?

[Kai Krueger]

Hi,
...
>
> I guess numbers 3) and 4) are problematic. I know they do much more
> than the current feature set of OSMdoc but I implemented them because
> those were two fairly often requested features. I guess their priority
> just dropped a lot :)
>
> So I guess my current solution would be to offer access to the
> aggregated statistical data and then offer two views into the other
> data. One for ODbL data and one for CC by-SA data. How would those two
> datasets have to be separated?
> Or to phrase it in another way: When can I combine ODbL data with CC
> by-SA data, how do I do that and what do I have to do to comply to
> (both) licenses?

Independent of the fact that this remains an interesting discussion 
about the effects of both the licenses, I am wondering if some of the 
practical issues here for OSMdoc come from a different understanding of 
what is going to happen with the changeover than what I thought was planned.

My understanding is the following (assuming everything goes ahead): At 
some point there will be a cut off when the actual switch happens. At 
that point there will be a planet dump with full history of everything 
in OSM licensed under CC-BY-SA. Afterwards, all the data that can not be 
relicensed will be taken out of the main OSM database after which, again 
a dump of the planet including full history of everything that remains 
will be produced and now licensed under the ODbL.

It is not that the history data will only be available under CC-BY-SA 
and that ODbL only covers current and future data.

So the entire history of all then available OSM data will be licensed 
under the ODbL and can be used by OSMdoc. The only history that is 
missing from the ODbL dump is of that that has been removed from the 
ODbL version of OSM. So if that amount of data was deemed sufficiently 
little as that it won't harm OSM as a project and thus the relicensing 
can go ahead, I would have thought that that is also sufficiently little 
to not effect OSMdoc particularly either and can be dropped from OSMdoc 
statistics. At that point you have no worries about mixing the two 
licenses anymore.

Not sure if that was in anyway unclear to start with, but I thought it 
was worth pointing out, just in case.

Kai

>
> Cheers,
> Lars
>
> [1] http://www.openstreetmap.org/browse/way/45724946
>
>