<html><head></head><body><div><br><blockquote class="mori" style="margin:0 0 0 .8ex;border-left:1px solid #CCC;padding-left:1ex;">If you plan to mash up OSM data with your own (not OSM) data in your product, I believe you are obliged to contribute your data back to OSM. I might be wrong, but this is my understanding of the license.
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</blockquote></div><div><br></div><div>That's not exactly true - or in two words:"It depends"<br><br>If you apply the concept of collective database, then the OSM data remains under ODbL obviously.<br>Your own data you can release under any license you like.<br><br>https://osmfoundation.org/wiki/Licence/Licence_and_Legal_FAQ#1.9._Can_I_charge_for_distributing_OSM_data_or_data_derived_from_OSM_data?<br><br>please read on "Collective Database" that's how you solve any issues on licensing mixing.. basically you don't mix anything.<br><br>For more specific information read<br>https://osmfoundation.org/wiki/Licence/Community_Guidelines/Collective_Database_Guideline_Guideline<br>https://osmfoundation.org/wiki/Licence/Community_Guidelines/Regional_Cuts_-_Guideline<br>https://osmfoundation.org/wiki/Licence/Community_Guidelines/Horizontal_Map_Layers_-_Guideline<br><br>to understand the nuances and how to implement it properly.<br><br>But you can write your software, to maintain 2+ databases strictly separated multi-layers to the end-user and then the OSM part remains ODbL and the rest - whatever it has to be..</div><div><br></div><div>that's my understanding of the articles I mentioned above<br></div></body></html>