I think i know what you are talking about and ide love more information. Not 
only is this topic something i have thought to myself but i also have more 
ideas on this subject as you probibly do too. 



On Oct 16, 2012, at 7:14 PM, Frederik Ramm <frede...@remote.org> wrote:

> Hi,
> 
>   what I'm offering here is my personal interpretation and not legal advice. 
> I hope others will chime in.
> 
> On 16.10.2012 19:04, David Prime wrote:
>> I'm in the process of starting a service that uses, amongst other
>> sources, OSM data to compute various travel time metrics from a location.
> 
> It sounds as if your time travel metrics thereby become a database that is 
> derived from OpenStreetMap data.
> 
> You then "publicly use" that data by displaying it to someone.
> 
> If that is correct then the license requires, in addition to proper 
> attribution, that you, if requested by anyone who is a recipient of your 
> "public use", make the full database of time travel metrics available to them 
> unter the terms of ODBL 1.0. (*)
> 
> You do not have to make available the "other sources", only the derived 
> database.
> 
> If you have a long processing chain where you create several interim 
> databases, like
> 
> (OSM+other sources) => interim DB 1
> interim DB 1 => interim DB 2
> interim DB 2 => interim DB 3
> interim DB 3 => public use
> 
> then the "make available" requirement applies to the last in the chain of 
> interim databases, in this case, interim DB 3.
> 
> To avoid confusion:
> 
> 1. You do not have to make your data available proactively; you can wait 
> until someone asks you for it. Depending on your audience, of course, making 
> it available proactively could be easier.
> 
> 2. You do not have to make your data available to *everyone* - just those who 
> are the recipients of your "public use". So if you were to e.g. sell your 
> analyses to an elite circle of clients, only those would have the right to 
> request the data. (With the data being under ODbL, of course, they could then 
> pass it on to others.)
> 
> Bye
> Frederik
> 
> (*) The license also has alternatives to "making the data available"; you 
> could also make the process available that leads to the data. But I assume 
> this is not an interesting option for you.
> 
> -- 
> Frederik Ramm  ##  eMail frede...@remote.org  ##  N49°00'09" E008°23'33"
> 
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