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

From Nop ekkehart at gmx.de on Sat Jul 4 11:42:54 BST 2009


Christian Gawron schrieb:
> I don't see any difference between merging externally generated contour 
> lines into one IMG file or generating the contour lines with mkgmap - 
> the resulting IMG file looks the same.

The difference is what is being published: You may not create a map from 
both sources and redistribute it. But you may distribute each layer 
seperately and let the end user combine them into a map, which he may 
not redistribute.

> And I don't agree that this would be a derived work. OSM does not 
> contain any DEM data or contour lines, so by adding them the OSM layer 
> remains unchanged and clearly discernible from the contour lines, so I 
> would say the result is a collective work.

Discernible is not enough. You need to read through the full legalese. A 
collective work is defined as a collection of unmodified entities. This 
is definitely not true for a gmapsupp.img.

Took me a while to understand and believe how bad the current OSM 
licence is, too.


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