Development of Creative Commons licenses

[Mike Linksvayer <ml AT creativecommons.org>]

Greg London wrote:
> Rob Myers said:
> >Lots of work I'm finding is licensed CC-1.0 . My work is CC-2.0 . If I 
> contact
> >the licensor and ask them nicely to upgrade to CC-2.0, what is the *minimum*
> >required to effect this change? Can I just get an email from them saying 
> "yes,
> >I license this work 2.0" as sufficient proof?

You only need to ask permission to relicense or incorporate a 1.0 
licensed work into a 2.0 licensed work with the same license save 
version if the 1.0 license is ShareAlike.

> > Lots of work I'm finding is licensed CC-BY. My work is CC-BY-SA. If a work is
> > licensed CC-BY, I assume it cannot simply be mixed with CC-BY-SA. Is that
> > right? Again, if I ask the licensor nicely to offer the work BY-SA as a
> > dual-license alongside BY, can I just get a confirmation email from them? If
> > not, what's the minimum requirement?
>
> CC-BY is like a BSD with advertising clause, isn't it?

Not exactly.  The advertising clause sepcifically refers to advertising, 
see <http://www.gnu.org/philosophy/bsd.html>.

> You should be able to make a CC-BY work MORE restrictive
> by applying CC-SA and satisfy the CC-BY requirements.
>
> well, assuming you're derived version includes the
> attribution requirements of the original CC-BY work.
>
> You can take CC-BY and make it CC-BY-SA.
> But you can't take CC-BY-SA and make it CC-BY.

Right.

> that's my non-lawyer understanding...

Me too.

--
  Mike Linksvayer
  http://creativecommons.org/learn/aboutus/people#21