Hi Christoph,

  Thanks for the response. I reviewed the substantial guidelines, and I feel 
that it would be substantial as if I used it for one admin line, I'd want to 
use it for the entire country. 

   And as you say below, that if I use my own source of admin boundaries to 
form language polygons overlaid on the OSM boundaries, they will have 
mismatches. I compared what we currently have with Angola, and there are many 
places where our boundaries and OSM boundaries already coincide, but there are 
quite a few places where they differ. I'll keep looking into how I might be 
able to turn off/only download background without OSM admin boundaries to see 
if it is possible.


-----Original Message-----
From: Christoph Hormann [mailto:chris_horm...@gmx.de] 
Sent: Friday, January 20, 2017 10:13 AM
To: Licensing and other legal discussions.
Subject: Re: [OSM-legal-talk] Series of maps for Angola

On Friday 20 January 2017, Marcus Love wrote:
> I was
> thinking, that if I use OSM as a background, that I could edit the 
> language polygons that we have to follow along OSM admin boundaries 
> where they coincide. However, if I do that, would it then make those 
> polygons that I've edited a 'derivative database'?

Probably yes, this depends on the extent to which you make use of OSM data in 
your proprietary data set.  See also:


If you'd just adjust your polygons at a handful of places to fix major 
mismatches that would normally be considered insubstantial.

>   If that isn't possible to adapt our language polygons to OSM admin 
> boundaries without it becoming a derivative database, then we would 
> use another source for the admin boundaries. Is it possible to use an 
> OSM background and turn off/toggle the admin boundaries for the 
> basemap? Otherwise, we will have language boundaries which will be 
> slightly off the OSM admin boundaries, and wouldn't look that great 
> and might be confusing on the map.

If you render an OSM based map without OSM based admin boundaries and add admin 
boundaries from a different source you have no derivative database, see:


Note however in such a map you would then simply have other mismatches, i.e. 
between the admin boundaries and OSM based basemap features instead of between 
the admin boundaries and your special thematic layer.

Christoph Hormann

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