[OSM-talk] Question about contributor terms and derived contributions

[Nathan Edgars II]

Andreas Perstinger wrote:
> 
> On 2011-06-15 04:01, Nathan Edgars II wrote:
>> As far as I know, I have probably contributed data in the following
>> circumstances:
>> *Mapper A who has not accepted the change to ODbL drew two intersecting
>> roads.
>> *I note in person that there is a recently-added island-separated
>> right-turn lane, and I add it (way B) based on the ways added by A and a
>> rough estimate of its size.
>> Now I am the only contributor in the history of way B and all of its
>> nodes. Yet their locations are based on cc-by-sa data, and cannot be
>> distributed under ODbL.
> 
> Why should way B be based on way A? You have been there, noticed the new 
> way and added it.
> 
Added it *based on existing data*. For simplicity, take the beginning of the
way. This is a new node created by me, but lies along an existing way, and
is thus related linearly to two existing nodes. We call this a derivative
work.

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