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== What do you mean by Share-Alike?==
The CC-BY-SA summarises Share-Alike as "If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one."
In other words,
* You can do what you like at home, or in your school, organisation or company. Share-Alike only applies if you distribute what you have done to outside people or organisations.
* if you make a map from OSM data and publish, you license the map as CC-BY-SA. Anyone can make a copy of your map without paying you or asking your permission.
* if you mix OSM data with other data and publish, you license it all as CC-BY-SA. Anyone can make a copy of your data without paying you or asking your permission.
One problem with CC-BY-SA is where does Share-Alike stop. If you "build upon this work" to make a book with a map in it, does that mean people can copy just the map or the whole book? This is not clear and one reason we want to change the license. Meanwhile, the community has so far generally accepted the following guidelines. The OpenStreetMap Foundation is happy with these guidelines, but we must point out that the final decision is up to any individual contributor, not us.
* If you publish a map inside a larger work, Share-Alike applies to the map, not the larger work.
* If you have a website using OSM-derived map tiles, Share-Alike applies to the map tiles. If you then put separate and distinct data layers on top, such as icons showing specialists points of interest or routes, track logs and the like, then Share-Alike does not apply to these elements as long as they do not interact with the map underneath.
* If you enhance OSM data with other data, for example adding missing roads or adding more restaurants, then Share-Alike applies to the whole thing. This is generally known as a "Derived Work".
* If you publish a set of OSM data as a file or database, with other separate files or databases, this is generally known as a "Collective Work". The CC-BY-SA clearly states that Share-Alike does not apply to the other parts of a Collective Work.
== More information about CC-BY-SA ==
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