[OSM-legal-talk] Reverse-Engineering Maps and Share-Alike Licences

[Rob Myers]

On Mon, Mar 9, 2009 at 8:26 PM, Ulf Möller <usenet at ulfm.de> wrote:
> Rob Myers schrieb:
>
>>> A license which:
>>> - preserves the freedoms to copy, share, modify and redistribute
>>> and
>>> - requires you to license derivative works under the same license.
>>
>> That covers CC-BY-NC-SA. ;-)
>
> Is that a problem? The current ODbL covers NC, just not SA.

When the ODbL covers *any* derivatives equally, NC should of course be covered.

When the ODbL grants special status to copyleft licences, NC should
not be covered by this.

NC is not a "free" licence by any definition (the FSF, OSI, Debian or
Freedom Defined). In practical terms it is not a copyleft licence as
it does not pass on the copyright holder's right to sell copies of the
work. So any criteria for compatible licences should exclude
non-commercial licences, either by explicitly saying this or by
acknowledging that people can charge for copies of the work.

- Rob.