Check OSM licence

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Check OSM license for derivative work and add the required links / references / texts

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Disclaimer: I'm not a lawyer, so I may be missing something.

Important links:

• http://wiki.openstreetmap.org/wiki/Legal_FAQ
• http://wiki.osmfoundation.org/wiki/Licence
• https://opendatacommons.org/licenses/odbl/
• https://opendatacommons.org/licenses/odbl/summary/
• https://opendatacommons.org/licenses/odbl/1.0/

Key points:

• [From the FAQ] If I have data derived from OSM data, do I have to distribute it? No, but if you do the derivative database must be available under the same licence as the OSM data (the Open Database License).
• [From the FAQ] I would like to use OpenStreetMap maps. How should I credit you? "© OpenStreetMap contributors" / "Map data © OpenStreetMap contributors".
• [From the FAQ] If I make something with OSM data, do I now have to apply your license to my whole work? No, only the data is covered by the license. However, if you make a database which includes OSM data and any additional information, then this would be classed as a "derivative database" and should be made available under the Open Database License.

Main takeaways:

• Our code licence is not affected by OSM licence.
• I think the files we generate when using OSM as a source are a derivative work.
• We are not forced to make public the files we generate from OSM data for internal use.

Having said that, I would try to stay in the safe side and prepare the files we generate to be openly distributed, so I would suggest to add the following when using OSM data:

• "Map data from © OpenStreetMap contributors".
• The ODBL licence header (https://opendatacommons.org/licenses/odbl/)