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If you adapt them to work together (for example, by taking footpaths from the OSM data, roads from the third-party data, and connecting them for routing), this is a Derivative Database and so you must (as per 3b).
However, if the two datasets are matched "trivially" by, for example, automated matching using a simple criterion such as name/locality, this is not "substantial" and remains a Collective Database.
However, if you happen to use data provided solely by one or a few OSM contributors, you can ask them if they are willing to provide their data to you under a different license.
Yes, provided that you are only comparing and do not copy any Open Street Map data.
Approach the data owners, explain OSM, and seek written permission to licence their data under our licence and contributor terms.
If the two datasets are independent, no, you don't; this is a Collective Database.
Be aware that this page can be edited by any registered user and does not represent the views of the OSMF.
The data is licensed by the OSM Foundation as granted by the contributor terms.
Therefore: If you are producing library code that offers Open Street Map data or tiles, you should make sure library users are aware of these terms.
We strongly recommend that you display this credit by default when your library is used.