My name is Mike and I have a legal question with regards to the usage of OSM 

I'm an engineer who started a project with a few friends. Essentially, we're 
planning on creating scenes of various cities for fight simulators (and 
possible games later on).

We get data from various different sources to construct our scenes. From OSM, 
we use very little of the data, more specifically:

BUILDINGS: We get the vector data for buildings, and we then model our own 
buildings partly based on this data.
We essentially get the "way" information about the corners delimiting the 
building, so that we know where to place our buildings. In cases where the 
height information is available on OSM, sometimes we use it. But very often we 
invent our own (since the data is not available). We just make sure that it's 
somewhat realistic.
We then apply our own textures to artistically draw and shade-in the sides of 
the buildings. We add random windows and doors (not based on anything from OSM).
We also add our own buildings for locations where there are no OSM buildings 
found but we feel like we should add some more.
We are definitely not re-packaging and selling the OSM data. What we do is 
really just use the information to generate our own scenes, and that's with a 
lot of modification and extrapolation, to make it looks artistically realistic.
BRIDGES: We sometimes use OSM data in order to determine where there are 
bridges. Then we insert some generic models of 3D bridges that we've created 
into the scene at those locations.

We hope to one day sell our Scenes to be used by engines that make flight 
simulators. We wanted to make sure to cover our bases, and so we read the 
License Agreements, and we also got a lawyer to read it over. We know that we 
would have to credit OSM for the usage of the data, but the lawyer is asking us 
a lot of questions such as:

Do we generate a "Derivative Database" or a "Collective Database"?
Can we really sell this "Produced Work"? Do we have to make our "Produced Work" 
available for free?
Our lawyer seems to think that perhaps we have to offer our "Produced Work" for 
free. He mentions that we are allowed to create works from the database as long 
as "Share-Alike" and "Keep open". We think that perhaps he's misinterpreting 
what it means, because it seems like there are many companies out there doing 
exactly what we plan on doing, and they sell the end-products for money.

This seems like a fairly straightforward use-case for us, but being engineers, 
we're having trouble with the legal lingo. And the lawyer we're dealing with 
seems to not understand technology...

We know there are several other companies out there that do almost exactly what 
we do. For example, the Polish company "Drzewiecki Design" creates scenes (such 
as New York) for the X-Plane simulator company. They use some OSM data to 
generate their scenes (which they sell to users who want to fly in those 
cities), and they credit you on their website. (example: 

Another example of a game that uses OSM data and sells their end-product would 
be "Monopoly City Streets" by Hasbro.

Can we assume that's all we would have to do is clearly credit OSM? Can you 
please confirm that what I described does not consist of a "Derived Database"? 
Or at least that we would not have to make available a free version of our 
"Produced Work"? (We only in part use OSM data, and then we render the rest 
based on our own assumptions and artistic creativity)

Thanks ahead of time!

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