[OSM-legal-talk] Are objects still tainted when they are edited from a better source ?

[Jean-Marc Liotier]

Continued from a talk at osm thread, as suggested by Mikel Maron.

When I use high-resolution imagery to improve areas formerly mapped from 
low-resolution imagery, I change the source tag on the objects I touch - 
i.e. from "Yahoo low resolution satellite" to "Microsoft Bing 
satellite". Since my edit is correlated with a change of source, can it 
still be considered as a tainted derivative ?

Modifying a way mapped from low-resolution imagery to take advantage of 
high-resolution imagery changes it so much that the result barely takes 
advantage of the previous version. It does take advantage of the fact 
that the object exists, which makes the work somewhat easier (except 
maybe in dense areas where it can even make it more complicated) - is 
that enough to make it a derivative work unable to be migrated under the 
new license ? That improvement process is rather close to a remapping... 
Or should I just remap ?

What is the opinion the experts on legal-talk ?

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