[OSM-talk] Transition to CC-4 instead of destroying data

[Mike Dupont]

On Wed, Dec 14, 2011 at 5:51 AM, Steve Bennett <stevagewp at gmail.com> wrote:
> On Wed, Dec 14, 2011 at 10:02 AM, Henk Hoff <toffehoff at gmail.com> wrote:
>> Changing to ODbL or CC4 (possibly in the future) does not change the
>> presence of the Contributor Terms.
>
> Is it possible to migrate from CC3 to CC4 without CTs?

Good question.
OSM is using Creative Commons Attribution-ShareAlike 2.0
license.http://creativecommons.org/licenses/by-sa/2.0/

it says:
    A new version of this license is available. You should use it for
new works, and you may want to relicense   existing works under it. No
works are automatically put under the new license, however.

Now, even if the work is not relicensed automatically, it should be compatible.
so if the new contribution is under 4.0, it can use data from 2.0.

see also :
http://wiki.creativecommons.org/Frequently_Asked_Questions
    All of the ShareAlike licenses starting from version 2.0 are
compatible with future versions of the ShareAlike  licenses. If you
want to make an adaptation using a photograph that is licensed under a
BY-SA 2.0 license, you can  apply BY-SA 3.0 to the adaptation. The
licenses are not backward compatible, however. You cannot create an
adaptation of a work licensed under BY-SA 3.0 and license the
derivative under BY-SA 2.0.

Of course this is a topic for legal talk, no this list.
thanks,
mike
>
> Steve
>
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-- 
James Michael DuPont
Member of Free Libre Open Source Software Kosova http://flossk.org