[OSM-talk] License plan - what data would need deleting

[David Lynch]

On Wed, Mar 4, 2009 at 08:19, Ed Avis <eda at waniasset.com> wrote:
> Ben Laenen <benlaenen at gmail.com> writes:
>
>>Suppose I split a way into two parts. The second part now gets uploaded
>>as a completely new object, with nothing in its history pointing
>>towards its origin.
>
> Although the way is new, don't the nodes along it keep their identity?

True, but what if I create a node at the same place I split? For
instance, if I take an existing way and split it in two places to add
a bridge tag, you'd end up with something like this:

( 1 )------A----( 2 )====B====( 3 )------C------( 4 )

Nodes 2 and 3 have no reference to the original user in their
individual histories, so it would be impossible to know that they are
derived from whoever did the original way. Similarly, neither Way B
nor any of its nodes have any reference back.

Or, what if I happen to move every node in a way and change every
single tag, and then the original mapper opts out of the license? What
appears in the database at the current time is entirely my work, even
though the refusenik appears in the history.

Someone upthread suggested reverting to the database as it stood just
before the first contribution from someone who refuses the new
license, and I'm beginning to fear that's the only way to guarantee a
completely clean version.

-- 
David J. Lynch
djlynch at gmail.com