Thread:Copyleft/share-alike (2)

No, because this would open up a way to lock down the knowledge by re-releasing it as (e.g.) copyright all rights reserved.

It might be okay to re-release under a free/libre share-alike license such as CC BY-SA ... but this complicates things (for a start one would need to drop the libre emblem, and successive derived works would have to be exactly CC BY-SA).