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cc-licenses - Re: [cc-licenses] Can a by-NC-sa use material from a by-sa? Seems no

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Subject: Development of Creative Commons licenses

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  • From: Terry Hancock <hancock AT>
  • To: Discussion on the Creative Commons license drafts <cc-licenses AT>
  • Subject: Re: [cc-licenses] Can a by-NC-sa use material from a by-sa? Seems no
  • Date: Wed, 03 May 2006 07:00:17 +0000

robinp AT wrote:

Thank you, Mia. Spot-on. Clearly by-sa is one of the five licenses that is
incompatible with all others.

But I wonder why material available for commercial use should not be copied
to a place where it isn't.

Never mind - I'll pass the info on to the owner who is thinking of adopting by-nc-sa.
Perhaps he will have second thoughts. I've seen opinions that suggest "NC"
has problems.

Because if you re-release a work from By-SA to By-NC-SA, you would not
be "sharing alike". You'd be violating the copyleft to release the work
under a more restrictive license.

It's exactly the same reason you can't appropriate a copyleft work and
release it under a full proprietary "all rights reserved" license.

Mind you, you can distribute the two works together, as long as they aren't
combined into one work (i.e. they remain separable).


Terry Hancock (hancock AT
Anansi Spaceworks

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