[OSM-legal-talk] share-alike on generalized data?

[Christoph Hormann]

On Saturday 06 February 2016, Tobias Wendorff wrote:
>
> Since this process includes an (automatic processed) interaction
> between foreign and OpenStreetMap data, share-alike might step in.

The relevant question here is if during this process you generate a 
derivative database containing both OSM and proprietary data.  If you 
do you'd need to share this database.

> Since the process of generalization doesn't make the quality of
> OpenStreetMap data any better (f.e. higher position error), the
> results won't be useful at all or could even have a bad effect,
> if they get imported back into OpenStreetMap.

From my perspective this is not relevant - first because usefulness is a 
subjective assessment and second because the ODbL share-alike 
provisions are not about usefulness, they are about giving something 
back in case the ODbL data is useful for you in connection with other 
data.  

But in your specific use case i see no real problem.  If you move the 
OSM street data to match your other information you can easily make 
available the modified street data.  If you do it the other way round 
modifying other data using OSM data things are more tricky.  But you 
can try to avoid that.

-- 
Christoph Hormann
http://www.imagico.de/