[OSM-legal-talk] instead of replacing data can I just revert to the last known "clean" version?

[Simon Poole]

See 
https://docs.google.com/document/pub?id=1pPOFHo_o5inG9Ereh3Zn5ItmctZGRFbcmnKwtbyNkdM 

item 7

Am 16.12.2011 14:08, schrieb Steve Bennett:
> On Fri, Dec 16, 2011 at 7:03 PM, Frederik Ramm<frederik at remote.org>  wrote:
>> * Agreeing user A creates the node with amenity=restaurant
>> * Disagreeing user B adds name=Fred's Pizza Place
>> * Agreeing user C changes name=Tom's Pasta Emporium
>>
>> this node is clearly "clean" already, because it does not contain traces of
>> B's work any longer. However a quite similar example...
>>
>> * Agreeing user A creates the node with amenity=restaurant
>> * Disagreeing user B adds name=Freds Pizza Place
>> * Agreeing user C changes name=Fred's Pizza Place
>>
>> ,,, suddenly isn't that clear-cut anymore. Has user C really surveyed the
>> place, or has he maybe just run a bot that used complex rules to "fix"
>> names?
> Do we have any clear policy spelling out what constitutes "clean"?
> Presumably there are some principles based on the "derived works"
> language in Creative Commons (IIRC...) But do we really know what a
> "derived work" for a single fact is?
>
> Does the test "does not contain traces of non-CT-accepting users'
> work" hold up? How is "trace" defined? etc etc
>
> Steve
>
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