>> Lastly, if an individual licenses under CC-SA, can some else then use/modify 
>> their work under CC-BY-SA?
> 
> Afaik, there is no CC-SA, BY is always implied!

Ah, right you are.  Not only is it implied, but it appears that every CC 
license includes BY.

>> It seems like a standard in the Sage community should be
>> advocated to avoid conflict.
> 
> Probably the best is to encourage everybody to think about licensing
> its creative content. Maybe it is a nice idea to add a license field
> to the published notebook. I.e. when you hit publish, you can select
> from licenses in a drop-down menu (default: proprietary) ... This
> might be such a standard? If somebody else thinks this is a good idea,
> it could be worth posting to the sage-notebook mailing list.

BIG PLUS1

Dana

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