Development of Creative Commons licenses

["Mike Linksvayer" <ml AT creativecommons.org>]

On Fri, 15 Aug 2003 20:40:34 -0400, "Evan Prodromou"
<evan AT wikitravel.org> said:
> OK, so, here's my inexpert analysis. (Note that not only am I not a
> lawyer, I'm not even particularly bright. Anyone foolish enough to
> take my crack-addled babblings as legal advice deserves whatever
> hellstorm is coming to them.)
> 
> Attribution -> Attribution
>             -> Attribution-NoDerivs
>             -> Attribution-NoDerivs-NonCommercial
>             -> Attribution-NonCommercial
>             -> Attribution-NonCommercial-ShareAlike
>             -> Attribution-ShareAlike
>             -> GNU Free Documentation License
> Attribution-NoDerivs -> [none]
> Attribution-NoDerivs-NonCommercial -> [none]
> Attribution-NonCommercial -> Attribution-NonCommercial
>                           -> Attribution-NonCommercial-NoDerivs
>                           -> Attribution-NonCommercial-ShareAlike
> Attribution-NonCommercial-ShareAlike ->
> Attribution-NonCommercial-ShareAlike
> Attribution-ShareAlike -> Attribution-ShareAlike
> NoDerivs -> [none]
> NoDerivs-NonCommercial -> [none]
> NonCommercial -> NonCommercial
>               -> NoDerivs-NonCommercial
>               -> Attribution-NoDerivs-NonCommercial
>               -> Attribution-NonCommercial
>               -> Attribution-NonCommercial-ShareAlike
> NonCommercial-ShareAlike -> NonCommercial-ShareAlike
> ShareAlike -> ShareAlike
> 
> I'm not sure about all of those. The *ShareAlike* and *NoDerivs* ones
> are easy; it's the Attribution, NonCommercial, and
> Attribution-NonCommercial that are a little dicey.

This agrees with my analysis.  So if you were to create a matrix with
each license repeated on the x and y axes and the intersection of
allowable derivative works in each cell, you get the allowed licenses
when creating a derived work from works under two licenses, e.g., start
with Attribution and NonCommercial works, you may use
Attribution-NonCommercial, Attribution-NoDerivs-NonCommercial, or
Attribution-NonCommercial-ShareAlike.
--
  Mike Linksvayer
  http://creativecommons.org/learn/aboutus/people#21