[mkgmap-dev] [PATCH] Creating contour lines from DEM data

Sat Jul 4 09:04:16 BST 2009

Hi!

Christian Gawron schrieb:
> 
>> A very good hint. The understanding of all discussions on the matter 
>> is that the current OSM licence does not allow mixing with CIAT data 
>> nor with ASTER data. So you cannot publish those maps.
> Could you elaborate on this? I would understand that e.g. the license of 
> the ASTER data forbids publishing of derived work (although I haven't 
> checked this). But is there really a point in the OSM license which 
> forbids creating derived works (maps) which as an "add-on" contain 
> features created from proprietary data sources?

Yes. To put it very simple: The share-alike cause of the OSM licence 
requires you to make everything available under the OSM licence again. 
If you combine OSM with other data which has _any_ form of restrictions 
or any different interpretation of freeness, you are breaking one of the 
licences.

A common workaround is to add the combined data in an extra layer and 
claim this makes a collective work. This is not legally sound, but has 
never been challenged.

I am putting my hope in the new licence which would allow you to create 
such a combined work.

bye
	Nop