On Wednesday, April 11, 2012 at 12:45 PM, Sarah wrote:

> Can anyone point me to the basis of the claim that cc licences are
> irrevocable?

http://wiki.creativecommons.org/Frequently_Asked_Questions#What_if_I_change_my_mind.3F




On Wednesday, April 11, 2012 at 12:45 PM, Sarah wrote:



>  If someone were to upload an image to Flickr with a cc
> non-commercial licence, then changed her mind and broadened it to
> allow commercial use, Commons would not reject the image on the
> grounds that the first, more restrictive, licence was irrevocable.

Not exactly. The license is irrevocable =/= license is exclusive. We don't 
*have* to follow the NC license. 

Say the work was once BY-SA-NC and later changed to BY-SA, people can still 
create derivative work and license them with BY-SA-NC, *not* BY-SA.

(Do correct me if I'm wrong)

Best regards,
Benjamin Chen / User:Bencmq





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