[OSM-legal-talk] [talk] New site about the license change

[Anthony]

On Wed, Nov 17, 2010 at 4:40 AM, Rob Myers <rob at robmyers.org> wrote:
> On 11/17/2010 04:25 AM, Mike Linksvayer wrote:
>>
>> A bigger problem, in my mind, would be facilitating a fracturing of the
>> copyleft universe.
>
> ODbL "Produced Works" may be BY-SA.

Possibly.  But if so that BY-SA doesn't extend to the underlying data,
so it's rather useless.

Furthermore, you can't use pre-existing BY-SA data in your "Produced
Work", as that would violate the BY-SA clause that "You may not offer
or impose any terms on the Work that restrict the terms of this
License or the ability of the recipient of the Work to exercise the
rights granted to that recipient under the terms of the License."

The point of BY-SA is that you can do whatever you want with the work,
so long as you attribute and the derivative is BY-SA.  If you can't
reverse engineer the work to extract out the underlying data, and use
that underlying data under BY-SA, then the work can't meaningfully be
said to be under BY-SA.