On 07/24/2012 08:51 PM, Tadeusz Knapik wrote:
Hello,

ODbL has an attribution requirement. This lets you know where the original
database is from, and your responsibilities should you recreate part of it.

Should you recreate part of the original database, you know your
responsibilities due to the link to the license from the attribution.

There's no magic, the ODbL just follows its data using attribution.
Yes, but I can do my Produced Work and it'll CC-By-SA (let's say I
just do tiles from map of my area), attributing it. Someone else will
use my work (use the tiles, enriching it with self-generated trails,
added mountain tops etc), and put it on CC-By-SA ("my" CC-By-SA
doesn't order him to attribute OSM, he uses my product). And then
another one will use this last map to retrace the whole area into his
CC-By-SA map. Where is the point of breaking ODbL license?

You have to maintain attribution under BY-SA, so OSM has to be attributed at each point and no break will occur.

- Rob.

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