On 7/7/07, Eugene Zelenko eugene.zelenko@gmail.com wrote:
Free licenses are irrevocable. Only changes to less restrictive license should be allowed (for example, CC-BY-SA -> CC-BY).
Users can screw up. They must be allowed to change to the license they actually intended. Flickr would, I believe, not agree to an irreversable license change because of the tech support headache it would cause.
On the other hand, keeping a license history might be a good idea.
-Matt