[OSM-legal-talk] CC-BY-SA for source data, other license for rendered derivatives

[Richard Fairhurst]

Frederik Ramm wrote:

> If someone bought proprietary data about, say, air pollution, with
> the right to create and publish maps from it but not the right to
> distribute the data, then a requirement like the one you sketched
> above would make it impossible for him to draw air pollution data
> onto OSM data and publish the resulting images, because that would
> force him to publish the air pollution data and he's not allowed to
> do that.

Well, personally, as you know, I agree 100% with you. The situation  
you describe is the one that exists at present and I think it's a  
shame. But I'm not very optimistic that we could get agreement to  
change this from the rest of the OSM community.

At present we have an explicit statement on the wiki, which no-one has  
challenged, that putting data in separate "layers" of your webmap  
doesn't trigger ShareAlike. (I _think_ this was inserted by Imi, one  
of the most fervent CC-SA advocates.) I'd suggest this is retained  
whatever happens. Otherwise, we would have the situation that you  
could use Google Maps for mashups but not OSM, which is lunatic.

This is a bit of a workaround, it's true, and it doesn't work for  
paper maps (unless you use tracing paper!), but to me it seems the  
least bad compromise.

cheers
Richard