[OSM-talk] open data

[Richard Fairhurst]

Paul Dixon <paul at elphin.com> wrote:

> AFAIK, CC-SA doesn't require you to share the materials you used to
> create your work, you just need to share the derivative work itself. (In
> order to apply the licence to your work, you must of course have the
> *right* to create and distribute derivative works from your source
> materials).
>
> If you released your map as CC-SA, it would mean I could, say, take the
> image and rework it so it was wallet sized, say. But it doesn't give me
> the right to demand the materials you used to make it.
>
> I am not a lawyer, that's just my current understanding - happy to be
> corrected!

Yeah, sorry, you're quite right and I was waxing lyrical.

To correct:

- CC-SA means OSM doesn't get the useful bit (the geodata), it gets  
the pretty map (which it doesn't have much use for).

- A more specific ShareAlike data licence would mean that OSM got the  
useful geodata and didn't require the pretty map.

This is an even stronger reason why CC-SA is not optimal for geodata.

cheers
Richard